Polyoxometalate-based catalysts for photocatalytic,chemical catalytic and electrocatalytic water oxidation |
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| Authors: | Du Xiaoqiang Xu Zhoufeng Gong Yaqiong Ding Yong |
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| Affiliation: | 1. Chemical Engineering and Environment Institute, North University of China, Taiyuan 030051, PR China;2. Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, PR China |
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| Abstract: | Complex [Fe11 (H2O)14(OH)2(W3O10)2(α-SbW9O33)6]27?(2) has been studied independently under photocatalytic or chemical catalytic or electrocatalytic conditions by our group. (1) Under the optimal photocatalytic conditions (photoirradiation at λ = 420 nm, [Ru(bpy)3](ClO4)2 as the photosensor, Na2S2O8 as the oxidant in borate buffer (pH = 10.0)], the turnover number (TON) can reach as high as 1815, the initial quantum yield and the initial turnover frequency (TOF) for the first 60 s was 47% and 6.3 s?1, respectively. (2) We report herein that 2 are highly active homogeneous water oxidation catalysts when [Ru(bpy)3]3+ is used as the terminal oxidant, with a turnover number (TON) of higher than 78. (3) The current densities achieved during cyclic voltammetry (CV) show that 2 exhibit no electrocatalytic activity at pH 10.0. This study discusses the catalytic behaviors and mechanism of 2 in different experimental conditions (driving forces) for water oxidation. |
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| Keywords: | Polyoxometalate Chemical catalytic Photocatalytic Electrocatalytic Water oxidation |
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