Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction

Tungsten disulfide nanosheets were successfully prepared by one-step chemical vapor deposition using tungsten oxide and thiourea in an inert gas environment. The size of the obtained nanosheets was subsequently reduced down to below 20 nm in width and 150 nm in length using high-energy ball milling,...
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Autor*in:	Mahmoud Nasr [verfasserIn] Lamyae Benhamou [verfasserIn] Ahmed Kotbi [verfasserIn] Nitul S. Rajput [verfasserIn] Andrea Campos [verfasserIn] Abdel-Ilah Lahmar [verfasserIn] Khalid Hoummada [verfasserIn] Khaled Kaja [verfasserIn] Mimoun El Marssi [verfasserIn] Mustapha Jouiad [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2022

Schlagwörter:	WS graphene@WS photochemical measurements water splitting reversible hydrogen electrode (RHE) photoanode

Übergeordnetes Werk:	In: Nanomaterials - MDPI AG, 2012, 12(2022), 11, p 1914
Übergeordnetes Werk:	volume:12 ; year:2022 ; number:11, p 1914

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/nano12111914

Katalog-ID:	DOAJ04285251X

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520			\|a Tungsten disulfide nanosheets were successfully prepared by one-step chemical vapor deposition using tungsten oxide and thiourea in an inert gas environment. The size of the obtained nanosheets was subsequently reduced down to below 20 nm in width and 150 nm in length using high-energy ball milling, followed by 0.5 and 1 wt% graphene loading. The corresponding vibrational and structural characterizations are consistent with the fabrication of a pure WS<sub<2</sub< structure for neat sampling and the presence of the graphene characteristic vibration modes in grapheneWS<sub<2</sub< compounds. Additional morphological and crystal structures were examined and confirmed by high-resolution electron microscopy. Subsequently, the investigations of the optical properties evidenced the high optical absorption (98%) and lower band gap (1.75 eV) for the graphene@WS<sub<2</sub< compared to the other samples, with good band-edge alignment to water-splitting reaction. In addition, the photoelectrochemical measurements revealed that the graphene@WS<sub<2</sub< (1 wt%) exhibits an excellent photocurrent density (95 μA/cm<sup<2</sup< at 1.23 V bias) compared with RHE and higher applied bias potential efficiency under standard simulated solar illumination AM1.5G. Precisely, graphene@WS<sub<2</sub< (1 wt%) exhibits 3.3 times higher performance compared to pristine WS<sub<2</sub< and higher charge transfer ability, as measured by electrical impedance spectroscopy, suggesting its potential use as an efficient photoanode for hydrogen evolution reaction.
650		4	\|a WS<sub<2</sub< nanosheets
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author_variant	m n mn l b lb a k ak n s r nsr a c ac a i l ail k h kh k k kk m e m mem m j mj
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allfields	10.3390/nano12111914 doi (DE-627)DOAJ04285251X (DE-599)DOAJ7c38f641248e41c0a9bea068dbcdc01f DE-627 ger DE-627 rakwb eng QD1-999 Mahmoud Nasr verfasserin aut Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Tungsten disulfide nanosheets were successfully prepared by one-step chemical vapor deposition using tungsten oxide and thiourea in an inert gas environment. The size of the obtained nanosheets was subsequently reduced down to below 20 nm in width and 150 nm in length using high-energy ball milling, followed by 0.5 and 1 wt% graphene loading. The corresponding vibrational and structural characterizations are consistent with the fabrication of a pure WS<sub<2</sub< structure for neat sampling and the presence of the graphene characteristic vibration modes in grapheneWS<sub<2</sub< compounds. Additional morphological and crystal structures were examined and confirmed by high-resolution electron microscopy. Subsequently, the investigations of the optical properties evidenced the high optical absorption (98%) and lower band gap (1.75 eV) for the graphene@WS<sub<2</sub< compared to the other samples, with good band-edge alignment to water-splitting reaction. In addition, the photoelectrochemical measurements revealed that the graphene@WS<sub<2</sub< (1 wt%) exhibits an excellent photocurrent density (95 μA/cm<sup<2</sup< at 1.23 V bias) compared with RHE and higher applied bias potential efficiency under standard simulated solar illumination AM1.5G. Precisely, graphene@WS<sub<2</sub< (1 wt%) exhibits 3.3 times higher performance compared to pristine WS<sub<2</sub< and higher charge transfer ability, as measured by electrical impedance spectroscopy, suggesting its potential use as an efficient photoanode for hydrogen evolution reaction. WS<sub<2</sub< nanosheets graphene@WS<sub<2</sub< photochemical measurements water splitting reversible hydrogen electrode (RHE) photoanode Chemistry Lamyae Benhamou verfasserin aut Ahmed Kotbi verfasserin aut Nitul S. Rajput verfasserin aut Andrea Campos verfasserin aut Abdel-Ilah Lahmar verfasserin aut Khalid Hoummada verfasserin aut Khaled Kaja verfasserin aut Mimoun El Marssi verfasserin aut Mustapha Jouiad verfasserin aut In Nanomaterials MDPI AG, 2012 12(2022), 11, p 1914 (DE-627)718627199 (DE-600)2662255-5 20794991 nnns volume:12 year:2022 number:11, p 1914 https://doi.org/10.3390/nano12111914 kostenfrei https://doaj.org/article/7c38f641248e41c0a9bea068dbcdc01f kostenfrei https://www.mdpi.com/2079-4991/12/11/1914 kostenfrei https://doaj.org/toc/2079-4991 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 12 2022 11, p 1914
spelling	10.3390/nano12111914 doi (DE-627)DOAJ04285251X (DE-599)DOAJ7c38f641248e41c0a9bea068dbcdc01f DE-627 ger DE-627 rakwb eng QD1-999 Mahmoud Nasr verfasserin aut Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Tungsten disulfide nanosheets were successfully prepared by one-step chemical vapor deposition using tungsten oxide and thiourea in an inert gas environment. The size of the obtained nanosheets was subsequently reduced down to below 20 nm in width and 150 nm in length using high-energy ball milling, followed by 0.5 and 1 wt% graphene loading. The corresponding vibrational and structural characterizations are consistent with the fabrication of a pure WS<sub<2</sub< structure for neat sampling and the presence of the graphene characteristic vibration modes in grapheneWS<sub<2</sub< compounds. Additional morphological and crystal structures were examined and confirmed by high-resolution electron microscopy. Subsequently, the investigations of the optical properties evidenced the high optical absorption (98%) and lower band gap (1.75 eV) for the graphene@WS<sub<2</sub< compared to the other samples, with good band-edge alignment to water-splitting reaction. In addition, the photoelectrochemical measurements revealed that the graphene@WS<sub<2</sub< (1 wt%) exhibits an excellent photocurrent density (95 μA/cm<sup<2</sup< at 1.23 V bias) compared with RHE and higher applied bias potential efficiency under standard simulated solar illumination AM1.5G. Precisely, graphene@WS<sub<2</sub< (1 wt%) exhibits 3.3 times higher performance compared to pristine WS<sub<2</sub< and higher charge transfer ability, as measured by electrical impedance spectroscopy, suggesting its potential use as an efficient photoanode for hydrogen evolution reaction. WS<sub<2</sub< nanosheets graphene@WS<sub<2</sub< photochemical measurements water splitting reversible hydrogen electrode (RHE) photoanode Chemistry Lamyae Benhamou verfasserin aut Ahmed Kotbi verfasserin aut Nitul S. Rajput verfasserin aut Andrea Campos verfasserin aut Abdel-Ilah Lahmar verfasserin aut Khalid Hoummada verfasserin aut Khaled Kaja verfasserin aut Mimoun El Marssi verfasserin aut Mustapha Jouiad verfasserin aut In Nanomaterials MDPI AG, 2012 12(2022), 11, p 1914 (DE-627)718627199 (DE-600)2662255-5 20794991 nnns volume:12 year:2022 number:11, p 1914 https://doi.org/10.3390/nano12111914 kostenfrei https://doaj.org/article/7c38f641248e41c0a9bea068dbcdc01f kostenfrei https://www.mdpi.com/2079-4991/12/11/1914 kostenfrei https://doaj.org/toc/2079-4991 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 12 2022 11, p 1914
allfields_unstemmed	10.3390/nano12111914 doi (DE-627)DOAJ04285251X (DE-599)DOAJ7c38f641248e41c0a9bea068dbcdc01f DE-627 ger DE-627 rakwb eng QD1-999 Mahmoud Nasr verfasserin aut Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Tungsten disulfide nanosheets were successfully prepared by one-step chemical vapor deposition using tungsten oxide and thiourea in an inert gas environment. The size of the obtained nanosheets was subsequently reduced down to below 20 nm in width and 150 nm in length using high-energy ball milling, followed by 0.5 and 1 wt% graphene loading. The corresponding vibrational and structural characterizations are consistent with the fabrication of a pure WS<sub<2</sub< structure for neat sampling and the presence of the graphene characteristic vibration modes in grapheneWS<sub<2</sub< compounds. Additional morphological and crystal structures were examined and confirmed by high-resolution electron microscopy. Subsequently, the investigations of the optical properties evidenced the high optical absorption (98%) and lower band gap (1.75 eV) for the graphene@WS<sub<2</sub< compared to the other samples, with good band-edge alignment to water-splitting reaction. In addition, the photoelectrochemical measurements revealed that the graphene@WS<sub<2</sub< (1 wt%) exhibits an excellent photocurrent density (95 μA/cm<sup<2</sup< at 1.23 V bias) compared with RHE and higher applied bias potential efficiency under standard simulated solar illumination AM1.5G. Precisely, graphene@WS<sub<2</sub< (1 wt%) exhibits 3.3 times higher performance compared to pristine WS<sub<2</sub< and higher charge transfer ability, as measured by electrical impedance spectroscopy, suggesting its potential use as an efficient photoanode for hydrogen evolution reaction. WS<sub<2</sub< nanosheets graphene@WS<sub<2</sub< photochemical measurements water splitting reversible hydrogen electrode (RHE) photoanode Chemistry Lamyae Benhamou verfasserin aut Ahmed Kotbi verfasserin aut Nitul S. Rajput verfasserin aut Andrea Campos verfasserin aut Abdel-Ilah Lahmar verfasserin aut Khalid Hoummada verfasserin aut Khaled Kaja verfasserin aut Mimoun El Marssi verfasserin aut Mustapha Jouiad verfasserin aut In Nanomaterials MDPI AG, 2012 12(2022), 11, p 1914 (DE-627)718627199 (DE-600)2662255-5 20794991 nnns volume:12 year:2022 number:11, p 1914 https://doi.org/10.3390/nano12111914 kostenfrei https://doaj.org/article/7c38f641248e41c0a9bea068dbcdc01f kostenfrei https://www.mdpi.com/2079-4991/12/11/1914 kostenfrei https://doaj.org/toc/2079-4991 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 12 2022 11, p 1914
allfieldsGer	10.3390/nano12111914 doi (DE-627)DOAJ04285251X (DE-599)DOAJ7c38f641248e41c0a9bea068dbcdc01f DE-627 ger DE-627 rakwb eng QD1-999 Mahmoud Nasr verfasserin aut Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Tungsten disulfide nanosheets were successfully prepared by one-step chemical vapor deposition using tungsten oxide and thiourea in an inert gas environment. The size of the obtained nanosheets was subsequently reduced down to below 20 nm in width and 150 nm in length using high-energy ball milling, followed by 0.5 and 1 wt% graphene loading. The corresponding vibrational and structural characterizations are consistent with the fabrication of a pure WS<sub<2</sub< structure for neat sampling and the presence of the graphene characteristic vibration modes in grapheneWS<sub<2</sub< compounds. Additional morphological and crystal structures were examined and confirmed by high-resolution electron microscopy. Subsequently, the investigations of the optical properties evidenced the high optical absorption (98%) and lower band gap (1.75 eV) for the graphene@WS<sub<2</sub< compared to the other samples, with good band-edge alignment to water-splitting reaction. In addition, the photoelectrochemical measurements revealed that the graphene@WS<sub<2</sub< (1 wt%) exhibits an excellent photocurrent density (95 μA/cm<sup<2</sup< at 1.23 V bias) compared with RHE and higher applied bias potential efficiency under standard simulated solar illumination AM1.5G. Precisely, graphene@WS<sub<2</sub< (1 wt%) exhibits 3.3 times higher performance compared to pristine WS<sub<2</sub< and higher charge transfer ability, as measured by electrical impedance spectroscopy, suggesting its potential use as an efficient photoanode for hydrogen evolution reaction. WS<sub<2</sub< nanosheets graphene@WS<sub<2</sub< photochemical measurements water splitting reversible hydrogen electrode (RHE) photoanode Chemistry Lamyae Benhamou verfasserin aut Ahmed Kotbi verfasserin aut Nitul S. Rajput verfasserin aut Andrea Campos verfasserin aut Abdel-Ilah Lahmar verfasserin aut Khalid Hoummada verfasserin aut Khaled Kaja verfasserin aut Mimoun El Marssi verfasserin aut Mustapha Jouiad verfasserin aut In Nanomaterials MDPI AG, 2012 12(2022), 11, p 1914 (DE-627)718627199 (DE-600)2662255-5 20794991 nnns volume:12 year:2022 number:11, p 1914 https://doi.org/10.3390/nano12111914 kostenfrei https://doaj.org/article/7c38f641248e41c0a9bea068dbcdc01f kostenfrei https://www.mdpi.com/2079-4991/12/11/1914 kostenfrei https://doaj.org/toc/2079-4991 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 12 2022 11, p 1914
allfieldsSound	10.3390/nano12111914 doi (DE-627)DOAJ04285251X (DE-599)DOAJ7c38f641248e41c0a9bea068dbcdc01f DE-627 ger DE-627 rakwb eng QD1-999 Mahmoud Nasr verfasserin aut Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Tungsten disulfide nanosheets were successfully prepared by one-step chemical vapor deposition using tungsten oxide and thiourea in an inert gas environment. The size of the obtained nanosheets was subsequently reduced down to below 20 nm in width and 150 nm in length using high-energy ball milling, followed by 0.5 and 1 wt% graphene loading. The corresponding vibrational and structural characterizations are consistent with the fabrication of a pure WS<sub<2</sub< structure for neat sampling and the presence of the graphene characteristic vibration modes in grapheneWS<sub<2</sub< compounds. Additional morphological and crystal structures were examined and confirmed by high-resolution electron microscopy. Subsequently, the investigations of the optical properties evidenced the high optical absorption (98%) and lower band gap (1.75 eV) for the graphene@WS<sub<2</sub< compared to the other samples, with good band-edge alignment to water-splitting reaction. In addition, the photoelectrochemical measurements revealed that the graphene@WS<sub<2</sub< (1 wt%) exhibits an excellent photocurrent density (95 μA/cm<sup<2</sup< at 1.23 V bias) compared with RHE and higher applied bias potential efficiency under standard simulated solar illumination AM1.5G. Precisely, graphene@WS<sub<2</sub< (1 wt%) exhibits 3.3 times higher performance compared to pristine WS<sub<2</sub< and higher charge transfer ability, as measured by electrical impedance spectroscopy, suggesting its potential use as an efficient photoanode for hydrogen evolution reaction. WS<sub<2</sub< nanosheets graphene@WS<sub<2</sub< photochemical measurements water splitting reversible hydrogen electrode (RHE) photoanode Chemistry Lamyae Benhamou verfasserin aut Ahmed Kotbi verfasserin aut Nitul S. Rajput verfasserin aut Andrea Campos verfasserin aut Abdel-Ilah Lahmar verfasserin aut Khalid Hoummada verfasserin aut Khaled Kaja verfasserin aut Mimoun El Marssi verfasserin aut Mustapha Jouiad verfasserin aut In Nanomaterials MDPI AG, 2012 12(2022), 11, p 1914 (DE-627)718627199 (DE-600)2662255-5 20794991 nnns volume:12 year:2022 number:11, p 1914 https://doi.org/10.3390/nano12111914 kostenfrei https://doaj.org/article/7c38f641248e41c0a9bea068dbcdc01f kostenfrei https://www.mdpi.com/2079-4991/12/11/1914 kostenfrei https://doaj.org/toc/2079-4991 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 12 2022 11, p 1914
language	English
source	In Nanomaterials 12(2022), 11, p 1914 volume:12 year:2022 number:11, p 1914
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callnumber-first	Q - Science
author	Mahmoud Nasr
spellingShingle	Mahmoud Nasr misc QD1-999 misc WS<sub<2</sub< nanosheets misc graphene@WS<sub<2</sub< misc photochemical measurements misc water splitting misc reversible hydrogen electrode (RHE) misc photoanode misc Chemistry Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction
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topic_title	QD1-999 Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction WS<sub<2</sub< nanosheets graphene@WS<sub<2</sub< photochemical measurements water splitting reversible hydrogen electrode (RHE) photoanode
topic	misc QD1-999 misc WS<sub<2</sub< nanosheets misc graphene@WS<sub<2</sub< misc photochemical measurements misc water splitting misc reversible hydrogen electrode (RHE) misc photoanode misc Chemistry
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title	Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction
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title_sort	photoelectrochemical enhancement of graphenews<sub<2</sub< nanosheets for water splitting reaction
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title_auth	Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction
abstract	Tungsten disulfide nanosheets were successfully prepared by one-step chemical vapor deposition using tungsten oxide and thiourea in an inert gas environment. The size of the obtained nanosheets was subsequently reduced down to below 20 nm in width and 150 nm in length using high-energy ball milling, followed by 0.5 and 1 wt% graphene loading. The corresponding vibrational and structural characterizations are consistent with the fabrication of a pure WS<sub<2</sub< structure for neat sampling and the presence of the graphene characteristic vibration modes in grapheneWS<sub<2</sub< compounds. Additional morphological and crystal structures were examined and confirmed by high-resolution electron microscopy. Subsequently, the investigations of the optical properties evidenced the high optical absorption (98%) and lower band gap (1.75 eV) for the graphene@WS<sub<2</sub< compared to the other samples, with good band-edge alignment to water-splitting reaction. In addition, the photoelectrochemical measurements revealed that the graphene@WS<sub<2</sub< (1 wt%) exhibits an excellent photocurrent density (95 μA/cm<sup<2</sup< at 1.23 V bias) compared with RHE and higher applied bias potential efficiency under standard simulated solar illumination AM1.5G. Precisely, graphene@WS<sub<2</sub< (1 wt%) exhibits 3.3 times higher performance compared to pristine WS<sub<2</sub< and higher charge transfer ability, as measured by electrical impedance spectroscopy, suggesting its potential use as an efficient photoanode for hydrogen evolution reaction.
abstractGer	Tungsten disulfide nanosheets were successfully prepared by one-step chemical vapor deposition using tungsten oxide and thiourea in an inert gas environment. The size of the obtained nanosheets was subsequently reduced down to below 20 nm in width and 150 nm in length using high-energy ball milling, followed by 0.5 and 1 wt% graphene loading. The corresponding vibrational and structural characterizations are consistent with the fabrication of a pure WS<sub<2</sub< structure for neat sampling and the presence of the graphene characteristic vibration modes in grapheneWS<sub<2</sub< compounds. Additional morphological and crystal structures were examined and confirmed by high-resolution electron microscopy. Subsequently, the investigations of the optical properties evidenced the high optical absorption (98%) and lower band gap (1.75 eV) for the graphene@WS<sub<2</sub< compared to the other samples, with good band-edge alignment to water-splitting reaction. In addition, the photoelectrochemical measurements revealed that the graphene@WS<sub<2</sub< (1 wt%) exhibits an excellent photocurrent density (95 μA/cm<sup<2</sup< at 1.23 V bias) compared with RHE and higher applied bias potential efficiency under standard simulated solar illumination AM1.5G. Precisely, graphene@WS<sub<2</sub< (1 wt%) exhibits 3.3 times higher performance compared to pristine WS<sub<2</sub< and higher charge transfer ability, as measured by electrical impedance spectroscopy, suggesting its potential use as an efficient photoanode for hydrogen evolution reaction.
abstract_unstemmed	Tungsten disulfide nanosheets were successfully prepared by one-step chemical vapor deposition using tungsten oxide and thiourea in an inert gas environment. The size of the obtained nanosheets was subsequently reduced down to below 20 nm in width and 150 nm in length using high-energy ball milling, followed by 0.5 and 1 wt% graphene loading. The corresponding vibrational and structural characterizations are consistent with the fabrication of a pure WS<sub<2</sub< structure for neat sampling and the presence of the graphene characteristic vibration modes in grapheneWS<sub<2</sub< compounds. Additional morphological and crystal structures were examined and confirmed by high-resolution electron microscopy. Subsequently, the investigations of the optical properties evidenced the high optical absorption (98%) and lower band gap (1.75 eV) for the graphene@WS<sub<2</sub< compared to the other samples, with good band-edge alignment to water-splitting reaction. In addition, the photoelectrochemical measurements revealed that the graphene@WS<sub<2</sub< (1 wt%) exhibits an excellent photocurrent density (95 μA/cm<sup<2</sup< at 1.23 V bias) compared with RHE and higher applied bias potential efficiency under standard simulated solar illumination AM1.5G. Precisely, graphene@WS<sub<2</sub< (1 wt%) exhibits 3.3 times higher performance compared to pristine WS<sub<2</sub< and higher charge transfer ability, as measured by electrical impedance spectroscopy, suggesting its potential use as an efficient photoanode for hydrogen evolution reaction.
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title_short	Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction
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Photoelectrochemical Enhancement of GrapheneWS<sub<2</sub< Nanosheets for Water Splitting Reaction

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