期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 263, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118180
关键词
ZnO/Au/g-C3N4; Z-scheme; 3D micro/nanostructure; Water splitting; Photocathode
资金
- National Key RAMP
- D Program of China (International Collaboration program) - Chinese Ministry of Science and Technology [2018YFE020313, 2016YFE0129800]
- National Natural Science Foundation of China [21822202]
- Jiangsu Key Laboratory for Carbon-Based Functional Materials Devices [KJS1807]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
All-solid-state Z-scheme photocatalyts have been widely used in solar water splitting, but most of the previous applications are achieved through powder systems. Herein, a Z-scheme ZnO/Au/graphitic carbon nitride (g-C3N4) composite heterojunction with three-dimensional (3D) urchin-like micro/nanostructure has been successfully fabricated and applied as an excellent photocathode for PEC H-2 evolution. The 3D urchin-like ZnO/Au/g-C3N4 heterostructure provides a rapid Z-scheme charge-carrier transport and collection channel. The characterization of electrochemical impedance and time-resolved photoluminescence confirm that the incorporated Au nanoparticles act as an electron mediator to promote vectorial electron transfer in direct Z-scheme ZnO/g-C3N4 heterojunction. With a bias of 0 V vs. RHE in neutral electrolyte (0.2 M Na2SO4), the Pt co-catalysts loaded Z-scheme ZnO/Au/g-C3N4 photocathode shows a stable photocurrent as high as -0.29 mA cm(-2) over 36,000 s. This work delivers a new insight to the future development of novel all-solid-state Z-scheme photoelectrodes for efficiently converting solar energy into hydrogen fuels.
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