Enhanced Overall Water Splitting by a Zirconium‐Doped TaON‐Based Photocatalyst

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 excitat...

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Veröffentlicht in:Angewandte Chemie International Edition 2022-04, Vol.61 (17), p.e202116573-n/a
Hauptverfasser: Xiao, Jiadong, Nishimae, Shinji, Vequizo, Junie Jhon M., Nakabayashi, Mamiko, Hisatomi, Takashi, Li, Huihui, Lin, Lihua, Shibata, Naoya, Yamakata, Akira, Inoue, Yasunobu, Domen, Kazunari
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Sprache:eng
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Zusammenfassung: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. By the invention of an amorphous Ta2O5⋅3.3 H2O nanopowder precursor together with Zr doping as the main strategies, detrimental TaIII defect species and grain boundaries were eliminated in the resultant TaON particles. These effects have improved the photocatalytic overall water splitting efficiency of TaON by an order of magnitude.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202116573