Journal
CHEMPHOTOCHEM
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cptc.202200211
Keywords
H-2 evolution; photocatalysis; redox mediator; water splitting; Z-scheme
Categories
Funding
- National Natural Science Foundation of China
- Anhui Provincial Natural Science Foundation
- Key Research and Development Program of Anhui Province
- [U1832165]
- [21902001]
- [2008085QB85]
- [202004a05020015]
- [006233172019]
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This study describes the construction of a Z-scheme photocatalytic system for overall solar water splitting using CdS and WO3 as H-2-evolving and O-2-evolving photocatalysts, respectively. Optimization of cocatalyst, shuttle redox mediator, and pH conditions determines the stoichiometric water splitting, and the activity attenuation during long-term reaction can be alleviated by filling the system with moderate argon.
Visible-light-driven Z-scheme photocatalytic systems are very appealing for achieving efficient overall water splitting. However, developing the Z-scheme using long wavelength responsive sulfides as H-2-evolving photocatalysts remains challenging. Herein, the construction of Z-scheme photocatalytic systems for overall solar water splitting is described using CdS and WO3 as H-2-evolving and O-2-evolving photocatalysts, respectively, in the presence of a shuttle redox mediator. The stoichiometric water splitting into H-2 and O-2 under the solar-simulated irradiation was determined through optimization of cocatalyst, shuttle redox mediator, and pH conditions. The activity attenuation during the long-term reaction was mainly attributed to the backward reaction which can be alleviated by filling the system with moderate argon. This work provides a new photocatalysts combination for the Z-scheme overall water splitting, further reflecting the importance of modulation of redox mediator environments.
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