期刊
CHEMSUSCHEM
卷 8, 期 16, 页码 2630-2634出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201500490
关键词
cobalt; homogeneous catalysis; photocatalysis; polyoxometalates; water oxidation
资金
- National Natural Science Foundation of China [21173105]
To overcome the bottleneck of water splitting, the exploration of efficient, selective, and stable water oxidation catalysts (WOCs) is crucial. We report an all-inorganic, oxidatively and hydrolytically stable WOC based on a polyoxometalate [(A-alpha-SiW9O34)(2)Co-8(OH)(6)(H2O)(2)(CO3)(3)](16)center dot(Co8POM). As a cobalt(II)-based cubane water oxidation catalyst, Co8POM embeds double (Co4O3)-O-II cores. The self-assembled catalyst is similar to the oxygen evolving complex (OEC) of photosystem II (PS II). Using [Ru(bpy)(3)](2+) as a photosensitizer and persulfate as a sacrificial electron acceptor, Co8POM exhibits excellent water oxidation activity with a turnover number (TON) of 1436, currently the highest among bioinspired catalysts with a cubical core, and a high initial turnover frequency (TOF). Investigation by several spectroscopy, spectrometry, and other techniques confirm that Co8POM is a stable and efficient catalyst for visible light-driven water oxidation. The results offer a useful insight into the design of water oxidation catalysts.
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