Understanding the roles of NiOx in enhancing the photoelectrochemical performance of BiVO4 photoanodes for solar water splitting
Solar water oxidation is considered as a promising method for efficient utilization of solar energy and bismuth vanadate (BiVO4) is a potential photoanode. Catalyst loading on BiVO4 is often used to tackle the limitations of charge recombination and sluggish kinetics. In this study, amorphous nickel...
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sg-ntu-dr.10356-1450322023-07-14T15:48:41Z Understanding the roles of NiOx in enhancing the photoelectrochemical performance of BiVO4 photoanodes for solar water splitting Zhang, Mengyuan Antony, Rajini P. Chiam, Sing Yang Abdi, Fatwa Firdaus Wong, Lydia Helena School of Materials Science and Engineering Institute of Materials Research and Engineering, A*STAR Institute for Solar Fuels, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Engineering::Materials Band Bending Bismuth Vanadate Solar water oxidation is considered as a promising method for efficient utilization of solar energy and bismuth vanadate (BiVO4) is a potential photoanode. Catalyst loading on BiVO4 is often used to tackle the limitations of charge recombination and sluggish kinetics. In this study, amorphous nickel oxide (NiOx) is loaded onto Mo‐doped BiVO4 by photochemical metal–organic deposition method. The resulting NiOx/Mo:BiVO4 photoanodes demonstrate a two‐fold improvement in photocurrent density (2.44 mA cm−2) at 1.23 V versus reversible hydrogen electrode (RHE) compared with the uncatalyzed samples. After NiOx modification the charge‐separation and charge‐transfer efficiencies improve significantly across the entire potential range. It is further elucidated by open‐circuit photovoltage (OCP), time‐resolved‐microwave conductivity (TRMC), and rapid‐scan voltammetry (RSV) measurements that NiOx modification induces larger band bending and promotes efficient charge transfer on the surface of BiVO4. This work provides insight into designing BiVO4‐catalyst assemblies by using a simple surface‐modification route for efficient solar water oxidation. Ministry of Education (MOE) National Research Foundation (NRF) Accepted version The authors would like to thank financial support from the Singapore Ministry of Education (MOE) Tier 2 grant (MOE2016T21030). The authors also acknowledge the funding support from the CREATE Program under the Campus for Research Excellence and Technological Enterprise (CREATE), which is supported by the National Research Foundation, Prime Minister’s Office, Singapore. This work was partially funded by the German Federal Ministry of Education and Research (BMBF), Singapore-German project “CT-PEC” (01DP14011). 2020-12-09T04:16:54Z 2020-12-09T04:16:54Z 2019 Journal Article Zhang, M., Antony, R. P., Chiam, S. Y., Abdi, F. F., & Wong, L. H. (2019). Understanding the roles of NiOx in enhancing the photoelectrochemical performance of BiVO4 photoanodes for solar water splitting. ChemSusChem, 12(9), 2022-2028. doi:10.1002/cssc.201801780 1864-564X https://hdl.handle.net/10356/145032 10.1002/cssc.201801780 9 12 2022 2028 en ChemSusChem This is the accepted version of the following article: Zhang, M., Antony, R. P., Chiam, S. Y., Abdi, F. F., & Wong, L. H. (2019). Understanding the roles of NiOx in enhancing the photoelectrochemical performance of BiVO4 photoanodes for solar water splitting. ChemSusChem, 12(9), 2022-2028. doi:10.1002/cssc.201801780, which has been published in final form athttps://doi.org/10.1002/cssc.201801780. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [https://authorservices.wiley.com/authorresources/Journal-Authors/licensing/self-archiving.html]. application/pdf application/pdf |
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Engineering::Materials Band Bending Bismuth Vanadate Zhang, Mengyuan Antony, Rajini P. Chiam, Sing Yang Abdi, Fatwa Firdaus Wong, Lydia Helena Understanding the roles of NiOx in enhancing the photoelectrochemical performance of BiVO4 photoanodes for solar water splitting |
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Solar water oxidation is considered as a promising method for efficient utilization of solar energy and bismuth vanadate (BiVO4) is a potential photoanode. Catalyst loading on BiVO4 is often used to tackle the limitations of charge recombination and sluggish kinetics. In this study, amorphous nickel oxide (NiOx) is loaded onto Mo‐doped BiVO4 by photochemical metal–organic deposition method. The resulting NiOx/Mo:BiVO4 photoanodes demonstrate a two‐fold improvement in photocurrent density (2.44 mA cm−2) at 1.23 V versus reversible hydrogen electrode (RHE) compared with the uncatalyzed samples. After NiOx modification the charge‐separation and charge‐transfer efficiencies improve significantly across the entire potential range. It is further elucidated by open‐circuit photovoltage (OCP), time‐resolved‐microwave conductivity (TRMC), and rapid‐scan voltammetry (RSV) measurements that NiOx modification induces larger band bending and promotes efficient charge transfer on the surface of BiVO4. This work provides insight into designing BiVO4‐catalyst assemblies by using a simple surface‐modification route for efficient solar water oxidation. |
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School of Materials Science and Engineering |
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School of Materials Science and Engineering Zhang, Mengyuan Antony, Rajini P. Chiam, Sing Yang Abdi, Fatwa Firdaus Wong, Lydia Helena |
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Article |
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Zhang, Mengyuan Antony, Rajini P. Chiam, Sing Yang Abdi, Fatwa Firdaus Wong, Lydia Helena |
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Zhang, Mengyuan |
title |
Understanding the roles of NiOx in enhancing the photoelectrochemical performance of BiVO4 photoanodes for solar water splitting |
title_short |
Understanding the roles of NiOx in enhancing the photoelectrochemical performance of BiVO4 photoanodes for solar water splitting |
title_full |
Understanding the roles of NiOx in enhancing the photoelectrochemical performance of BiVO4 photoanodes for solar water splitting |
title_fullStr |
Understanding the roles of NiOx in enhancing the photoelectrochemical performance of BiVO4 photoanodes for solar water splitting |
title_full_unstemmed |
Understanding the roles of NiOx in enhancing the photoelectrochemical performance of BiVO4 photoanodes for solar water splitting |
title_sort |
understanding the roles of niox in enhancing the photoelectrochemical performance of bivo4 photoanodes for solar water splitting |
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2020 |
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https://hdl.handle.net/10356/145032 |
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1772827086698840064 |