期刊
DALTON TRANSACTIONS
卷 45, 期 32, 页码 12897-12905出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6dt02148d
关键词
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资金
- National Natural Science Foundation of China [21271166, 21473170]
- Fundamental Research Funds for the Central Universities [WK2060140015, WK2060190026, WK3430000001]
- Program for New Century Excellent Talents in University (NCET)
- Young Thousand Talents Program
Photocatalytic hydrogen production via water splitting has attracted much attention for future clean energy application. Herein we report a noble-metal-free photocatalytic hydrogen production system containing a simple bidentate cobalt Schiff base complex as the molecular cocatalyst, CdS nanorods as the photosensitizer, and ascorbic acid as the electron donor. The system shows highly enhanced photocatalytic activity compared to pure CdS NRs under visible light (lambda > 420 nm). Under optimal conditions, the turnover numbers (TONs) for hydrogen production reached similar to 15 200 after 12 hours of irradiation, and an apparent quantum yield of similar to 27% was achieved at 420 nm monochromatic light. Steady-state photoluminescence (PL) spectra indicated efficient charge transfer between the excited CdS NRs and the cobalt cocatalyst for improved hydrogen production. Spectroscopic studies of the photocatalytic reaction revealed the reduction of the Co(II) complex to Co(I) species, which are probably active intermediates for hydrogen evolution. On the basis of the spectroscopic studies, we propose a reaction mechanism for hydrogen production in the present photocatalytic system.
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