The role of surface chemistry in the charge storage properties of graphene oxide
In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which rem...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Jovanovic, Z. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2017transfer abstract |
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| Umfang: |
16 |
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| Übergeordnetes Werk: |
Enthalten in: Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch - Zhang, Lei ELSEVIER, 2018, the journal of the International Society of Electrochemistry (ISE), New York, NY [u.a.] |
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| Übergeordnetes Werk: |
volume:258 ; year:2017 ; day:20 ; month:12 ; pages:1228-1243 ; extent:16 |
| Links: |
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| DOI / URN: |
10.1016/j.electacta.2017.11.178 |
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ELV041438736 |
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| 245 | 1 | 4 | |a The role of surface chemistry in the charge storage properties of graphene oxide |
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| 520 | |a In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. | ||
| 520 | |a In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. | ||
| 650 | 7 | |a Cyclic voltammetry |2 Elsevier | |
| 650 | 7 | |a Oxygen functional groups |2 Elsevier | |
| 650 | 7 | |a Graphene oxide |2 Elsevier | |
| 650 | 7 | |a Charge storage properties |2 Elsevier | |
| 650 | 7 | |a Thermal reduction |2 Elsevier | |
| 700 | 1 | |a Bajuk-Bogdanović, D. |4 oth | |
| 700 | 1 | |a Jovanović, S. |4 oth | |
| 700 | 1 | |a Mravik, Ž. |4 oth | |
| 700 | 1 | |a Kovač, J. |4 oth | |
| 700 | 1 | |a Holclajtner-Antunović, I. |4 oth | |
| 700 | 1 | |a Vujković, M. |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Zhang, Lei ELSEVIER |t Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch |d 2018 |d the journal of the International Society of Electrochemistry (ISE) |g New York, NY [u.a.] |w (DE-627)ELV001212419 |
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10.1016/j.electacta.2017.11.178 doi GBV00000000000369.pica (DE-627)ELV041438736 (ELSEVIER)S0013-4686(17)32540-9 DE-627 ger DE-627 rakwb eng 610 VZ 44.00 bkl Jovanovic, Z. verfasserin aut The role of surface chemistry in the charge storage properties of graphene oxide 2017transfer abstract 16 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. Cyclic voltammetry Elsevier Oxygen functional groups Elsevier Graphene oxide Elsevier Charge storage properties Elsevier Thermal reduction Elsevier Bajuk-Bogdanović, D. oth Jovanović, S. oth Mravik, Ž. oth Kovač, J. oth Holclajtner-Antunović, I. oth Vujković, M. oth Enthalten in Elsevier Zhang, Lei ELSEVIER Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch 2018 the journal of the International Society of Electrochemistry (ISE) New York, NY [u.a.] (DE-627)ELV001212419 volume:258 year:2017 day:20 month:12 pages:1228-1243 extent:16 https://doi.org/10.1016/j.electacta.2017.11.178 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.00 Medizin: Allgemeines VZ AR 258 2017 20 1220 1228-1243 16 |
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10.1016/j.electacta.2017.11.178 doi GBV00000000000369.pica (DE-627)ELV041438736 (ELSEVIER)S0013-4686(17)32540-9 DE-627 ger DE-627 rakwb eng 610 VZ 44.00 bkl Jovanovic, Z. verfasserin aut The role of surface chemistry in the charge storage properties of graphene oxide 2017transfer abstract 16 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. Cyclic voltammetry Elsevier Oxygen functional groups Elsevier Graphene oxide Elsevier Charge storage properties Elsevier Thermal reduction Elsevier Bajuk-Bogdanović, D. oth Jovanović, S. oth Mravik, Ž. oth Kovač, J. oth Holclajtner-Antunović, I. oth Vujković, M. oth Enthalten in Elsevier Zhang, Lei ELSEVIER Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch 2018 the journal of the International Society of Electrochemistry (ISE) New York, NY [u.a.] (DE-627)ELV001212419 volume:258 year:2017 day:20 month:12 pages:1228-1243 extent:16 https://doi.org/10.1016/j.electacta.2017.11.178 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.00 Medizin: Allgemeines VZ AR 258 2017 20 1220 1228-1243 16 |
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10.1016/j.electacta.2017.11.178 doi GBV00000000000369.pica (DE-627)ELV041438736 (ELSEVIER)S0013-4686(17)32540-9 DE-627 ger DE-627 rakwb eng 610 VZ 44.00 bkl Jovanovic, Z. verfasserin aut The role of surface chemistry in the charge storage properties of graphene oxide 2017transfer abstract 16 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. Cyclic voltammetry Elsevier Oxygen functional groups Elsevier Graphene oxide Elsevier Charge storage properties Elsevier Thermal reduction Elsevier Bajuk-Bogdanović, D. oth Jovanović, S. oth Mravik, Ž. oth Kovač, J. oth Holclajtner-Antunović, I. oth Vujković, M. oth Enthalten in Elsevier Zhang, Lei ELSEVIER Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch 2018 the journal of the International Society of Electrochemistry (ISE) New York, NY [u.a.] (DE-627)ELV001212419 volume:258 year:2017 day:20 month:12 pages:1228-1243 extent:16 https://doi.org/10.1016/j.electacta.2017.11.178 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.00 Medizin: Allgemeines VZ AR 258 2017 20 1220 1228-1243 16 |
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10.1016/j.electacta.2017.11.178 doi GBV00000000000369.pica (DE-627)ELV041438736 (ELSEVIER)S0013-4686(17)32540-9 DE-627 ger DE-627 rakwb eng 610 VZ 44.00 bkl Jovanovic, Z. verfasserin aut The role of surface chemistry in the charge storage properties of graphene oxide 2017transfer abstract 16 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. Cyclic voltammetry Elsevier Oxygen functional groups Elsevier Graphene oxide Elsevier Charge storage properties Elsevier Thermal reduction Elsevier Bajuk-Bogdanović, D. oth Jovanović, S. oth Mravik, Ž. oth Kovač, J. oth Holclajtner-Antunović, I. oth Vujković, M. oth Enthalten in Elsevier Zhang, Lei ELSEVIER Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch 2018 the journal of the International Society of Electrochemistry (ISE) New York, NY [u.a.] (DE-627)ELV001212419 volume:258 year:2017 day:20 month:12 pages:1228-1243 extent:16 https://doi.org/10.1016/j.electacta.2017.11.178 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.00 Medizin: Allgemeines VZ AR 258 2017 20 1220 1228-1243 16 |
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10.1016/j.electacta.2017.11.178 doi GBV00000000000369.pica (DE-627)ELV041438736 (ELSEVIER)S0013-4686(17)32540-9 DE-627 ger DE-627 rakwb eng 610 VZ 44.00 bkl Jovanovic, Z. verfasserin aut The role of surface chemistry in the charge storage properties of graphene oxide 2017transfer abstract 16 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. Cyclic voltammetry Elsevier Oxygen functional groups Elsevier Graphene oxide Elsevier Charge storage properties Elsevier Thermal reduction Elsevier Bajuk-Bogdanović, D. oth Jovanović, S. oth Mravik, Ž. oth Kovač, J. oth Holclajtner-Antunović, I. oth Vujković, M. oth Enthalten in Elsevier Zhang, Lei ELSEVIER Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch 2018 the journal of the International Society of Electrochemistry (ISE) New York, NY [u.a.] (DE-627)ELV001212419 volume:258 year:2017 day:20 month:12 pages:1228-1243 extent:16 https://doi.org/10.1016/j.electacta.2017.11.178 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.00 Medizin: Allgemeines VZ AR 258 2017 20 1220 1228-1243 16 |
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Enthalten in Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch New York, NY [u.a.] volume:258 year:2017 day:20 month:12 pages:1228-1243 extent:16 |
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Enthalten in Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch New York, NY [u.a.] volume:258 year:2017 day:20 month:12 pages:1228-1243 extent:16 |
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role of surface chemistry in the charge storage properties of graphene oxide |
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The role of surface chemistry in the charge storage properties of graphene oxide |
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In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. |
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In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. |
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In the present study we have evaluated the contribution of particular oxygen functional groups in the charge storage properties of graphene oxide (GO). This was achieved by a gradual thermal reduction of GO in an inert atmosphere (up to 800 °C) and thorough examination of functional groups which remained after each de-functionalization step. After identification of functional groups, the character of additional cyclovoltammetric peak, less pronounced than the main redox quinone/hydroquinone pair, and overall charge storage properties of GO were discussed from the perspective of different thermal stability of its surface groups. The results indicated three-stage deoxidation process of GO, each comprising of specific surface chemistry, structural changes and electrochemical behavior. The low capacitance, ∼50 F g−1, at T ≤ 300 °C was attributed to the presence of epoxy and carboxyl groups. The highest capacitance (120–130 F g−1) was observed in the case of GO reduced at 400 and 500 °C, which we attributed to positive effects of phenol and carbonyl/quinone groups, while at high temperatures (T ≥ 600 °C, ∼30 F g−1) the extensive desorption of functional groups and structural changes were emphasized as the main reasons for additional decrease of capacitance. Our results highlight the cases where the duality of interpretation of surface functional groups is likely to happen and indicate that not all functional groups play a positive role in charge storage behavior of graphene oxide. |
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