期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202116573
关键词
Defects; Oxynitride; Precursors; Solar Energy; Water Splitting
资金
- Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO)
- Nanotechnology Platform of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [JPMXP09-A-21-UT-0046]
Researchers have synthesized a solar-powered one-step-excitation overall water splitting photocatalyst with improved efficiency by modifying the synthetic precursor and controlling defects.
Solar-powered one-step-excitation overall water splitting (OWS) using semiconducting materials is a simple means of achieving scalable and sustainable hydrogen production. While tantalum oxynitride (TaON) is one of the few photocatalysts capable of promoting OWS via single-step visible-light excitation, the efficiency of this process remains extremely poor. The present work employed 15 nm amorphous Ta2O5.3.3 H2O nanoparticles as a new precursor together with Zr doping and an optimized nitridation duration to synthesize a TaON-based photocatalyst with reduced particle sizes and low defect densities. Upon loading with Ru/Cr2O3/IrO2 cocatalysts, this material exhibited stoichiometric water splitting into hydrogen and oxygen, with an order of magnitude improvement in efficiency. Our findings demonstrate the importance of inventing/selecting the appropriate synthetic precursor and of defect control for fabricating active OWS photocatalysts.
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