期刊
ACS CATALYSIS
卷 8, 期 9, 页码 8726-8738出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b01830
关键词
CdS; nickel hydroxide; nanoparticles; mesoporous materials; photocatalysis; hydrogen production
资金
- European Union
- ERC [ERC-09]
- Special Account for Research Funds of University of Crete [KA 4121]
- Greek State Scholarship Foundation-IKY Scholarships Programme (Human Resource Development, Education and Lifelong Learning Operational Program) through the action Reinforcement of Postdoctoral Researchers
Photocatalytic water splitting for hydrogen production is an emerging and promising strategy for converting solar energy into chemical fuels. To that end, the development of robust and highly active semiconductor materials is of eminent importance in this field. Here, we demonstrate high-surface-area mesoporous networks comprising interconnected beta-Ni(OH)(2) modified CdS nanocrystals (NCs) as highly active and stable photocatalysts for hydrogen generation. Compared to single-component CdS assemblies, Ni-modified materials present a strong enhancement of photocatalytic performance for hydrogen evolution under visible light irradiation (lambda >= 420 nm). By controlling the formation of beta-Ni(OH)(2) species, the mesoporous beta-Ni(OH)(2)/CdS heterojunction networks at a 10 wt % Ni content reached an outstanding photocatalytic H-2-evolution rate of 1.4 mmol h(-1) at 20 degrees C (or 35 mmol g(-1) h(-1) mass activity), associated with an apparent quantum yield (QY) of 72% at 420 nm in a 5 M NaOH aqueous solution containing 10% v/v ethanol as sacrificial reagent. Mechanistic study with UV vis/nearinfrared, photoluminescence, and electrochemical impedance spectroscopy and photocatalytic performance evaluation reveals that the improved photocatalytic performance arises from the strong electronic coupling and charge-transferred states at the p-n beta-Ni(OH)(2)/CdS heterojunctions. These beta-Ni(OH)(2) modified CdS mesoporous assemblies have important implications for renewable hydrogen generation technologies.
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