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Reliable bi-functional nickel-phosphate /TiO(2) integration enables stable n-GaAs photoanode for water oxidation under alkaline condition
Hydrogen is one of the most widely used essential chemicals worldwide, and it is also employed in the production of many other chemicals, especially carbon-free energy fuels produced via photoelectrochemical (PEC) water splitting. At present, gallium arsenide represents the most efficient photoanode...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10480475/ https://www.ncbi.nlm.nih.gov/pubmed/37669928 http://dx.doi.org/10.1038/s41467-023-41120-0 |
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author | Arunachalam, Maheswari Kanase, Rohini Subhash Zhu, Kai Kang, Soon Hyung |
author_facet | Arunachalam, Maheswari Kanase, Rohini Subhash Zhu, Kai Kang, Soon Hyung |
author_sort | Arunachalam, Maheswari |
collection | PubMed |
description | Hydrogen is one of the most widely used essential chemicals worldwide, and it is also employed in the production of many other chemicals, especially carbon-free energy fuels produced via photoelectrochemical (PEC) water splitting. At present, gallium arsenide represents the most efficient photoanode material for PEC water oxidation, but it is known to either be anodically photocorroded or photopassivated by native metal oxides in the competitive reaction, limiting efficiency and stability. Here, we report chemically etched GaAs that is decorated with thin titanium dioxide (~30 nm-thick, crystalline) surface passivation layer along with nickel-phosphate (Ni-Pi) cocatalyst as a surface hole-sink layer. The integration of Ni-Pi bifunctional co-catalyst results in a highly efficient GaAs electrode with a ~ 100 mV cathodic shift of the onset potential. In this work, the electrode also has enhanced photostability under 110 h testing for PEC water oxidation at a steady current density J(ph) > 25 mA·cm(−2). The Et-GaAs/TiO(2)/Ni-Pi║Ni-Pi tandem configuration results in the best unassisted bias-free water splitting device with the highest J(ph) (~7.6 mA·cm(−2)) and a stable solar-to-hydrogen conversion efficiency of 9.5%. |
format | Online Article Text |
id | pubmed-10480475 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-104804752023-09-07 Reliable bi-functional nickel-phosphate /TiO(2) integration enables stable n-GaAs photoanode for water oxidation under alkaline condition Arunachalam, Maheswari Kanase, Rohini Subhash Zhu, Kai Kang, Soon Hyung Nat Commun Article Hydrogen is one of the most widely used essential chemicals worldwide, and it is also employed in the production of many other chemicals, especially carbon-free energy fuels produced via photoelectrochemical (PEC) water splitting. At present, gallium arsenide represents the most efficient photoanode material for PEC water oxidation, but it is known to either be anodically photocorroded or photopassivated by native metal oxides in the competitive reaction, limiting efficiency and stability. Here, we report chemically etched GaAs that is decorated with thin titanium dioxide (~30 nm-thick, crystalline) surface passivation layer along with nickel-phosphate (Ni-Pi) cocatalyst as a surface hole-sink layer. The integration of Ni-Pi bifunctional co-catalyst results in a highly efficient GaAs electrode with a ~ 100 mV cathodic shift of the onset potential. In this work, the electrode also has enhanced photostability under 110 h testing for PEC water oxidation at a steady current density J(ph) > 25 mA·cm(−2). The Et-GaAs/TiO(2)/Ni-Pi║Ni-Pi tandem configuration results in the best unassisted bias-free water splitting device with the highest J(ph) (~7.6 mA·cm(−2)) and a stable solar-to-hydrogen conversion efficiency of 9.5%. Nature Publishing Group UK 2023-09-05 /pmc/articles/PMC10480475/ /pubmed/37669928 http://dx.doi.org/10.1038/s41467-023-41120-0 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Arunachalam, Maheswari Kanase, Rohini Subhash Zhu, Kai Kang, Soon Hyung Reliable bi-functional nickel-phosphate /TiO(2) integration enables stable n-GaAs photoanode for water oxidation under alkaline condition |
title | Reliable bi-functional nickel-phosphate /TiO(2) integration enables stable n-GaAs photoanode for water oxidation under alkaline condition |
title_full | Reliable bi-functional nickel-phosphate /TiO(2) integration enables stable n-GaAs photoanode for water oxidation under alkaline condition |
title_fullStr | Reliable bi-functional nickel-phosphate /TiO(2) integration enables stable n-GaAs photoanode for water oxidation under alkaline condition |
title_full_unstemmed | Reliable bi-functional nickel-phosphate /TiO(2) integration enables stable n-GaAs photoanode for water oxidation under alkaline condition |
title_short | Reliable bi-functional nickel-phosphate /TiO(2) integration enables stable n-GaAs photoanode for water oxidation under alkaline condition |
title_sort | reliable bi-functional nickel-phosphate /tio(2) integration enables stable n-gaas photoanode for water oxidation under alkaline condition |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10480475/ https://www.ncbi.nlm.nih.gov/pubmed/37669928 http://dx.doi.org/10.1038/s41467-023-41120-0 |
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