Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 43, Pages 18990-18995Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202008198
Keywords
cocatalysts; FeNi oxyhydroxides; oxygen evolution; solar energy
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Funding
- National Natural Science Foundation of China [21832005]
- China National Key Research and Development Plan Project [2018YFB1502000]
- DNL Cooperation Fund CAS [DNL201922]
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Understanding the origin of formation and active sites of oxygen evolution reaction (OER) cocatalysts is highly required for solar photoelectrochemical (PEC) devices that generate hydrogen efficiently from water. Herein, we employed a simple pH-modulated method for in situ growth of FeNi oxyhydroxide ultrathin layers on BiVO(4)photoanodes, resulting in one of the highest currently known PEC activities of 5.8 mA cm(-2)(1.23 V-RHE, AM 1.5 G) accompanied with an excellent stability. More importantly, both comparative experiments and density functional theory (DFT) studies clearly reveal that the selective formation of Bi-O-Fe interfacial bonds mainly contributes the enhanced OER activities, while the construction of V-O-Ni interfacial bonds effectively restrains the dissolution of V(5+)ions and promotes the OER stability. Thereby, the synergy between iron and nickel of FeNi oxyhydroxides significantly improved the PEC water oxidation properties of BiVO(4)photoanodes.
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