Journal
JOURNAL OF CATALYSIS
Volume 338, Issue -, Pages 168-173Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2016.02.024
Keywords
Artificial photosynthesis; Water oxidation; Surface photovoltage
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Funding
- Basic Research Program of China (973 Program) [2014CB239403]
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Water oxidation has long been considered to be the bottleneck of the water splitting reaction. Most semiconductor-based photocatalysts show low oxidation activity, mainly because of poor charge separation and transfer. Here, we construct an artificial photosynthetic system for photocatalytic water oxidation using BiVO4 as a photosensitizer and cubic Co complex as the oxygen-evolving catalyst. This system exhibits a high turnover frequency (TOF = 2.0 s(-1)) for O-2 evolution in the presence of NalO(3) as an electron acceptor, with an apparent quantum efficiency (AQE) yield of 4.5% at 420 nm, which is ninefold that of bare BiVO4 (0.5%), but the decomposition of the Co complex leads to decreased photocatalytic activity as time goes on. Spectroscopic studies confirmed an efficient interfacial hole transfer process from the semiconductor to the molecular catalyst. These results may shed light on designing artificial photocatalysts with highly efficient molecular catalysts and suitable semiconductor materials for water oxidation. (C) 2016 Elsevier Inc. All rights reserved.
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