A Bioinspired Molecular Polyoxometalate Catalyst with Two Cobalt(II) Oxide Cores for Photocatalytic Water Oxidation.
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-α-SiW9 O34)2Co8(OH)6(H2O)2(CO3)3](16-) (Co8 POM). As a cobalt(II)-based cubane water oxidation catalyst, Co8POM embeds double Co(II)4O3 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.
['Wei|Jie|J|', 'Feng|Yingying|Y|', 'Zhou|Panpan|P|', 'Liu|Yan|Y|', 'Xu|Jingyin|J|', 'Xiang|Rui|R|', 'Ding|Yong|Y|', 'Zhao|Chongchao|C|', 'Fan|Linyuan|L|', 'Hu|Changwen|C|']
D040761:Biomimetic Materials D002384:Catalysis D003035:Cobalt D056831:Coordination Complexes D008027:Light D009942:Organometallic Compounds D010084:Oxidation-Reduction D010087:Oxides D055668:Photochemical Processes D017319:Photosensitizing Agents D017973:Tungsten Compounds D014867:Water
polyoxometalates water oxidation cobalt homogeneous catalysis photocatalysis