期刊
JOURNAL OF CATALYSIS
卷 328, 期 -, 页码 308-315出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2014.12.006
关键词
Z-scheme water splitting; Photocatalyst; Hydrogen production; SrTiO3:La,Rh/Au/BiVO4; Solid-state device; Particle transfer; Electron transfer
资金
- Global Center of Excellence (GCOE) Program for Chemistry Innovation through Cooperation of Science and Engineering
- A3 Foresight Program of Japan Society for the Promotion of Science (JSPS)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- [23000009]
- [25810112]
A major challenge in developing high-performing Z-scheme water splitting systems lies in achieving efficient transfer of electrons between the H-2 and O-2 evolution photocatalysts. Here, we report a Z-scheme system consisting of H-2 evolution photocatalyst (HEP)/metal layer (M)/O-2 evolution photocatalyst (OEP), taking SrTiO3:La,Rh/Au/BiVO4 as a prototype. SrTiO3:La,Rh/Au/BiVO4 systems exhibit photocatalytic activities for overall water splitting that are 6 and 20 times higher than powder suspensions and SrTiO3:La,Rh/BiVO4 systems without metal layers, respectively. The SrTiO3:La,Rh/Au/BiVO4 system achieves an apparent quantum yield of 5.9% under monochromatic light irradiation at 418 nm and a solar-to-hydrogen conversion efficiency of 0.2%. The high performance of this system is due to the presence of the Au layer that transfers photogenerated electrons from BiVO4 to SrTiO3:La,Rh in an effective manner. The present study offers a new design concept for HEP/M/OEP solid-state devices to overcome the limitations of earlier Z-scheme systems and thus enable efficient photocatalytic water splitting. (C) 2014 Elsevier Inc. All rights reserved.
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