Polyoxometalate-based catalysts for photocatalytic, chemical catalytic and electrocatalytic water oxidation. (21st September 2017)

• Record Type: Journal Article
• Authors: Xiaoqiang, Du; Zhoufeng, Xu; Yaqiong, Gong; Yong, Ding
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 38(2017)
• Page Start: 24169
• Page End: 24175
• Publication Date: 2017-09-21
• Subjects: Polyoxometalate -- Chemical catalytic -- Photocatalytic -- Electrocatalytic -- Water oxidation; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.08.023
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Complex [Fe11 (H2 O)14 (OH)2 (W3 O10 )2 (α-SbW9 O33 )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, Na2 S2 O8 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 that2 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 that2 exhibit no electrocatalytic activity at pH 10.0. This study discusses the catalytic behaviors and mechanism of2 in different experimental conditions (driving forces) for water oxidation. Graphical abstract: Complex [Fe11 (H2 O)14 (OH)2 (W3 O10 )2 (α-SbW9 O33 )6 ] 27− (2) have been studied independently under photocatalytic or chemicalcatalytic or electrocatalytic conditions by our group. This study discusses the catalytic behaviors and mechanism of2 in different experimental conditions (driving forces) for water oxidation. Highlights: Water oxidation activity of complex2 has been studied. Compound2 are extremely stable under the studied chemical catalytic water oxidation. This study discusses the catalytic behaviors and mechanism of2 for water oxidation.