期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 255, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.117760
关键词
Photocatalytic; Hydrogen generation; Steer charge kinetics; TiO2; W2C@C
资金
- Support Plan for College Science and Technology Innovation Team of Henan Province [16IRTSTHN001]
- Science & Technology Innovation Talent Plan of Henan Province [174200510018]
- Outstanding Talent Research Fund of Zhengzhou University [32310149, 32310198, 32310222]
- Postdoctoral Science Foundation [1901006, 2019M652570, 2019M650172]
The constructing of functional materials with well-defined nanostructure, showing efficient charge separation and transportation properties, has been intensively and in depth investigated to fabricate catalysts for H-2 generation from solar-driven water reduction. Here we demonstrate that loading W2C@C structure in which each W2C nanoparticle (NP) is wrapped by carbon shell on surface of hollow TiO2 microspheres (HTMs) can enhance the separation of photogenerated electron-hole pairs by building an internal electric field in W2C@C/HTMs composite structure and act as the reaction active sites for water reduction. As expected, the optimized W2C@C/HTMs construction exhibits the highest photocatalytic H-2 generation rate of 6.91 mmol h(-1) g(-1) under simulated solar light illumination, over 20 times larger than that of bare HTMs. The underlying mechanism has been investigated from the perspective of photochemistry and photophysics based on a series of characterization techniques, which suggests that W2C@C can effectively steer the charge kinetics, maximizing the charge carriers' separation.
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