Elucidating the sources of activity and stability of FeP electrocatalyst for hydrogen evolution reactions in acidic and alkaline media

In this study, we conduct comprehensive experimental and theoretical investigations on the hydrogen evolution reaction (HER) preformation of FeP electrode in acidic and alkaline solutions. Theoretically, bulk Fe-O bond is unfavorable, but surface Fe-O bond is favorable and plays a negative role for...

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Main Authors: Zhao, Xin, Zhang, Zheng, Cao, Xun, Hu, Jun, Wu, Xinghua, Ng, Andrew Yun Ru, Lu, Guo-Ping, Chen, Zhong
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/150365
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1503652023-02-28T19:27:14Z Elucidating the sources of activity and stability of FeP electrocatalyst for hydrogen evolution reactions in acidic and alkaline media Zhao, Xin Zhang, Zheng Cao, Xun Hu, Jun Wu, Xinghua Ng, Andrew Yun Ru Lu, Guo-Ping Chen, Zhong School of Materials Science and Engineering School of Physical and Mathematical Sciences Engineering::Materials Hydrogen Evolution Reaction Iron Phosphides In this study, we conduct comprehensive experimental and theoretical investigations on the hydrogen evolution reaction (HER) preformation of FeP electrode in acidic and alkaline solutions. Theoretically, bulk Fe-O bond is unfavorable, but surface Fe-O bond is favorable and plays a negative role for HER. The presence of oxygen bonds (native or formed during reaction) is the root source of the reduced HER activity. Surface treatment in 37% HCl solution removes the oxide layer and significantly improves the HER performance, especially in alkaline solution. After etching, the overpotentials in 0.5 M H2SO4 are 79 and 95 mV at 10 and 20 mA cm−2, respectively. The ones in 1 M KOH are 95 and 102 mV at 10 and 20 mA cm−2, respectively. Long-term instability in alkaline solution is caused by the presence of oxygen in the electrolyte. Good stability can be realized by removing oxygen from the solution. Ministry of Education (MOE) National Research Foundation (NRF) Accepted version Financial support from following is gratefully acknowledged: Ministry of Education - Singapore (RG15/16, RG16/18), National Research Foundation, Singapore (SINBERISE), National Natural Science Foundation of China (No. 21676216). 2021-05-21T08:17:28Z 2021-05-21T08:17:28Z 2019 Journal Article Zhao, X., Zhang, Z., Cao, X., Hu, J., Wu, X., Ng, A. Y. R., Lu, G. & Chen, Z. (2019). Elucidating the sources of activity and stability of FeP electrocatalyst for hydrogen evolution reactions in acidic and alkaline media. Applied Catalysis B: Environmental, 260, 118156-. https://dx.doi.org/10.1016/j.apcatb.2019.118156 0926-3373 https://hdl.handle.net/10356/150365 10.1016/j.apcatb.2019.118156 2-s2.0-85072210838 260 118156 en RG15/16 RG16/18 SINBERISE Applied Catalysis B: Environmental © 2019 Elsevier B.V. All rights reserved. This paper was published in Applied Catalysis B: Environmental and is made available with permission of Elsevier B.V. application/pdf application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials
Hydrogen Evolution Reaction
Iron Phosphides
spellingShingle Engineering::Materials
Hydrogen Evolution Reaction
Iron Phosphides
Zhao, Xin
Zhang, Zheng
Cao, Xun
Hu, Jun
Wu, Xinghua
Ng, Andrew Yun Ru
Lu, Guo-Ping
Chen, Zhong
Elucidating the sources of activity and stability of FeP electrocatalyst for hydrogen evolution reactions in acidic and alkaline media
description In this study, we conduct comprehensive experimental and theoretical investigations on the hydrogen evolution reaction (HER) preformation of FeP electrode in acidic and alkaline solutions. Theoretically, bulk Fe-O bond is unfavorable, but surface Fe-O bond is favorable and plays a negative role for HER. The presence of oxygen bonds (native or formed during reaction) is the root source of the reduced HER activity. Surface treatment in 37% HCl solution removes the oxide layer and significantly improves the HER performance, especially in alkaline solution. After etching, the overpotentials in 0.5 M H2SO4 are 79 and 95 mV at 10 and 20 mA cm−2, respectively. The ones in 1 M KOH are 95 and 102 mV at 10 and 20 mA cm−2, respectively. Long-term instability in alkaline solution is caused by the presence of oxygen in the electrolyte. Good stability can be realized by removing oxygen from the solution.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Zhao, Xin
Zhang, Zheng
Cao, Xun
Hu, Jun
Wu, Xinghua
Ng, Andrew Yun Ru
Lu, Guo-Ping
Chen, Zhong
format Article
author Zhao, Xin
Zhang, Zheng
Cao, Xun
Hu, Jun
Wu, Xinghua
Ng, Andrew Yun Ru
Lu, Guo-Ping
Chen, Zhong
author_sort Zhao, Xin
title Elucidating the sources of activity and stability of FeP electrocatalyst for hydrogen evolution reactions in acidic and alkaline media
title_short Elucidating the sources of activity and stability of FeP electrocatalyst for hydrogen evolution reactions in acidic and alkaline media
title_full Elucidating the sources of activity and stability of FeP electrocatalyst for hydrogen evolution reactions in acidic and alkaline media
title_fullStr Elucidating the sources of activity and stability of FeP electrocatalyst for hydrogen evolution reactions in acidic and alkaline media
title_full_unstemmed Elucidating the sources of activity and stability of FeP electrocatalyst for hydrogen evolution reactions in acidic and alkaline media
title_sort elucidating the sources of activity and stability of fep electrocatalyst for hydrogen evolution reactions in acidic and alkaline media
publishDate 2021
url https://hdl.handle.net/10356/150365
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