期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 40, 页码 21205-21213出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta06644a
关键词
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资金
- Zhejiang Provincial Natural Science Foundation of China [LQ16B030002]
- National Natural Science Foundation of China [51502068, 51772071, 51572065]
- Zhejiang Provincial Natural Science Foundation for Distinguished Young Scholars [LR15E020001]
- National Basic Research Program of China [2013CB632404]
Photocatalytic overall splitting of H2O intoH(2) and O-2 using Z-scheme systems is a promising method for solar hydrogen generation. Most currently designed Z-scheme systems are usually based on precious metal cocatalyst modified semiconductor photocatalysts, thus exploiting noble-metal-free cocatalysts to replace precious metals is of huge interest. Herein, a noble-metal-free Z-scheme photocatalytic overall water splitting system was constructed by using MoS2/CdS as the H-2 evolution photocatalyst, Co3O4/BiVO4 as the oxygen evolution photocatalyst and a [Co(bpy)(3)](3+)/[Co(bpy)(3)](2+) redox couple as an electron mediator under visible light irradiation. It is found that the H-2 and O-2 evolution rates are approximate to an ideal ratio of 2 : 1, and the highest H-2 and O-2 evolution rates under visible light irradiation (lambda > 420 nm) are found to be 14.5 and 7.1 mu mol h(-1), respectively, with an excellent stability exceeding 12 h. The apparent quantum yield reaches up to 1.04% at wavelength lambda = 420 nm even without any noble metal. The excellent stability and efficiency of this designed Z-scheme system in neutral water demonstrate its potential use for solar hydrogen generation. This work provides a noble-metal-free approach to construct the Z-scheme photocatalytic overall water splitting system.
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