Locally confined membrane modification of sulfonated membranes for fuel cell application
We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined he...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Krishnan, N. Nambi [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2014transfer abstract |
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| Schlagwörter: |
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| Umfang: |
10 |
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| Übergeordnetes Werk: |
Enthalten in: Steering charge kinetics in W - Yue, Xin-Zheng ELSEVIER, 2019, the official journal of the North American Membrane Society, New York, NY [u.a.] |
|---|---|
| Übergeordnetes Werk: |
volume:454 ; year:2014 ; day:15 ; month:03 ; pages:174-183 ; extent:10 |
| Links: |
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| DOI / URN: |
10.1016/j.memsci.2013.12.020 |
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ELV017538947 |
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| 245 | 1 | 0 | |a Locally confined membrane modification of sulfonated membranes for fuel cell application |
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| 520 | |a We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. | ||
| 520 | |a We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. | ||
| 650 | 7 | |a Degradation |2 Elsevier | |
| 650 | 7 | |a Desulfonation |2 Elsevier | |
| 650 | 7 | |a Crosslinking |2 Elsevier | |
| 650 | 7 | |a Life time |2 Elsevier | |
| 650 | 7 | |a Membrane modification |2 Elsevier | |
| 650 | 7 | |a Polymer electrolyte fuel cell |2 Elsevier | |
| 700 | 1 | |a Henkensmeier, Dirk |4 oth | |
| 700 | 1 | |a Jang, Jong Hyun |4 oth | |
| 700 | 1 | |a Hink, Steffen |4 oth | |
| 700 | 1 | |a Kim, Hyoung-Juhn |4 oth | |
| 700 | 1 | |a Nam, Suk-Woo |4 oth | |
| 700 | 1 | |a Lim, Tae-Hoon |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Yue, Xin-Zheng ELSEVIER |t Steering charge kinetics in W |d 2019 |d the official journal of the North American Membrane Society |g New York, NY [u.a.] |w (DE-627)ELV002478420 |
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10.1016/j.memsci.2013.12.020 doi GBVA2014012000015.pica (DE-627)ELV017538947 (ELSEVIER)S0376-7388(13)00973-3 DE-627 ger DE-627 rakwb eng 570 570 DE-600 540 VZ 35.17 bkl 58.50 bkl 43.12 bkl Krishnan, N. Nambi verfasserin aut Locally confined membrane modification of sulfonated membranes for fuel cell application 2014transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. Degradation Elsevier Desulfonation Elsevier Crosslinking Elsevier Life time Elsevier Membrane modification Elsevier Polymer electrolyte fuel cell Elsevier Henkensmeier, Dirk oth Jang, Jong Hyun oth Hink, Steffen oth Kim, Hyoung-Juhn oth Nam, Suk-Woo oth Lim, Tae-Hoon oth Enthalten in Elsevier Yue, Xin-Zheng ELSEVIER Steering charge kinetics in W 2019 the official journal of the North American Membrane Society New York, NY [u.a.] (DE-627)ELV002478420 volume:454 year:2014 day:15 month:03 pages:174-183 extent:10 https://doi.org/10.1016/j.memsci.2013.12.020 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.17 Katalyse VZ 58.50 Umwelttechnik: Allgemeines VZ 43.12 Umweltchemie VZ AR 454 2014 15 0315 174-183 10 045F 570 |
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10.1016/j.memsci.2013.12.020 doi GBVA2014012000015.pica (DE-627)ELV017538947 (ELSEVIER)S0376-7388(13)00973-3 DE-627 ger DE-627 rakwb eng 570 570 DE-600 540 VZ 35.17 bkl 58.50 bkl 43.12 bkl Krishnan, N. Nambi verfasserin aut Locally confined membrane modification of sulfonated membranes for fuel cell application 2014transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. Degradation Elsevier Desulfonation Elsevier Crosslinking Elsevier Life time Elsevier Membrane modification Elsevier Polymer electrolyte fuel cell Elsevier Henkensmeier, Dirk oth Jang, Jong Hyun oth Hink, Steffen oth Kim, Hyoung-Juhn oth Nam, Suk-Woo oth Lim, Tae-Hoon oth Enthalten in Elsevier Yue, Xin-Zheng ELSEVIER Steering charge kinetics in W 2019 the official journal of the North American Membrane Society New York, NY [u.a.] (DE-627)ELV002478420 volume:454 year:2014 day:15 month:03 pages:174-183 extent:10 https://doi.org/10.1016/j.memsci.2013.12.020 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.17 Katalyse VZ 58.50 Umwelttechnik: Allgemeines VZ 43.12 Umweltchemie VZ AR 454 2014 15 0315 174-183 10 045F 570 |
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10.1016/j.memsci.2013.12.020 doi GBVA2014012000015.pica (DE-627)ELV017538947 (ELSEVIER)S0376-7388(13)00973-3 DE-627 ger DE-627 rakwb eng 570 570 DE-600 540 VZ 35.17 bkl 58.50 bkl 43.12 bkl Krishnan, N. Nambi verfasserin aut Locally confined membrane modification of sulfonated membranes for fuel cell application 2014transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. Degradation Elsevier Desulfonation Elsevier Crosslinking Elsevier Life time Elsevier Membrane modification Elsevier Polymer electrolyte fuel cell Elsevier Henkensmeier, Dirk oth Jang, Jong Hyun oth Hink, Steffen oth Kim, Hyoung-Juhn oth Nam, Suk-Woo oth Lim, Tae-Hoon oth Enthalten in Elsevier Yue, Xin-Zheng ELSEVIER Steering charge kinetics in W 2019 the official journal of the North American Membrane Society New York, NY [u.a.] (DE-627)ELV002478420 volume:454 year:2014 day:15 month:03 pages:174-183 extent:10 https://doi.org/10.1016/j.memsci.2013.12.020 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.17 Katalyse VZ 58.50 Umwelttechnik: Allgemeines VZ 43.12 Umweltchemie VZ AR 454 2014 15 0315 174-183 10 045F 570 |
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10.1016/j.memsci.2013.12.020 doi GBVA2014012000015.pica (DE-627)ELV017538947 (ELSEVIER)S0376-7388(13)00973-3 DE-627 ger DE-627 rakwb eng 570 570 DE-600 540 VZ 35.17 bkl 58.50 bkl 43.12 bkl Krishnan, N. Nambi verfasserin aut Locally confined membrane modification of sulfonated membranes for fuel cell application 2014transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. Degradation Elsevier Desulfonation Elsevier Crosslinking Elsevier Life time Elsevier Membrane modification Elsevier Polymer electrolyte fuel cell Elsevier Henkensmeier, Dirk oth Jang, Jong Hyun oth Hink, Steffen oth Kim, Hyoung-Juhn oth Nam, Suk-Woo oth Lim, Tae-Hoon oth Enthalten in Elsevier Yue, Xin-Zheng ELSEVIER Steering charge kinetics in W 2019 the official journal of the North American Membrane Society New York, NY [u.a.] (DE-627)ELV002478420 volume:454 year:2014 day:15 month:03 pages:174-183 extent:10 https://doi.org/10.1016/j.memsci.2013.12.020 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.17 Katalyse VZ 58.50 Umwelttechnik: Allgemeines VZ 43.12 Umweltchemie VZ AR 454 2014 15 0315 174-183 10 045F 570 |
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10.1016/j.memsci.2013.12.020 doi GBVA2014012000015.pica (DE-627)ELV017538947 (ELSEVIER)S0376-7388(13)00973-3 DE-627 ger DE-627 rakwb eng 570 570 DE-600 540 VZ 35.17 bkl 58.50 bkl 43.12 bkl Krishnan, N. Nambi verfasserin aut Locally confined membrane modification of sulfonated membranes for fuel cell application 2014transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. Degradation Elsevier Desulfonation Elsevier Crosslinking Elsevier Life time Elsevier Membrane modification Elsevier Polymer electrolyte fuel cell Elsevier Henkensmeier, Dirk oth Jang, Jong Hyun oth Hink, Steffen oth Kim, Hyoung-Juhn oth Nam, Suk-Woo oth Lim, Tae-Hoon oth Enthalten in Elsevier Yue, Xin-Zheng ELSEVIER Steering charge kinetics in W 2019 the official journal of the North American Membrane Society New York, NY [u.a.] (DE-627)ELV002478420 volume:454 year:2014 day:15 month:03 pages:174-183 extent:10 https://doi.org/10.1016/j.memsci.2013.12.020 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.17 Katalyse VZ 58.50 Umwelttechnik: Allgemeines VZ 43.12 Umweltchemie VZ AR 454 2014 15 0315 174-183 10 045F 570 |
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Enthalten in Steering charge kinetics in W New York, NY [u.a.] volume:454 year:2014 day:15 month:03 pages:174-183 extent:10 |
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Krishnan, N. Nambi @@aut@@ Henkensmeier, Dirk @@oth@@ Jang, Jong Hyun @@oth@@ Hink, Steffen @@oth@@ Kim, Hyoung-Juhn @@oth@@ Nam, Suk-Woo @@oth@@ Lim, Tae-Hoon @@oth@@ |
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locally confined membrane modification of sulfonated membranes for fuel cell application |
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Locally confined membrane modification of sulfonated membranes for fuel cell application |
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We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. |
| abstractGer |
We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. |
| abstract_unstemmed |
We report a method which protects sulfonated hydrocarbon based proton exchange membranes at the interface between active and non-active area and in the gas inlet/outlet areas, where stresses are maximal during fuel cell operation. The sensitive membrane regions are subjected to a locally confined heat treatment using a stainless steel frame, under which desulfonation and/or crosslinking reactions occur. While modifications in air limit the reaction temperature to 180°C, inert atmosphere allows to raise the temperature and thus to shorten the necessary reaction time from 24h to less than 30min. Membranes are prepared from a commercially available copolymer (SES0005, AquafoneTM), which has a high IEC (2.08meqg−1) and a water uptake of 64%. As expected, modified membranes show reduced IEC values, reduced water uptake, and increased dimensional stability. Catalyst coated membranes (CCMs) are assembled into single cells for fuel cell testing. A membrane modified on all edges shows a stable performance in H2/air fuel cell operation and an H2 crossover current density of 0.52mAcm−2, while a membrane modified only on two edges fails within 50h. Tensile and fuel cell tests show that the interface between modified and pristine area is not the preferred breaking point. |
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Locally confined membrane modification of sulfonated membranes for fuel cell application |
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|
| score |
7.4005327 |