A Fast Soluble Carbon-Free Molecular Water Oxidation Catalyst Based on Abundant Metals.

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Bibliographic Details
Title:	A Fast Soluble Carbon-Free Molecular Water Oxidation Catalyst Based on Abundant Metals.
Authors:	Yin, Qiushi, Tan, Miles, Besson, Claire, Geletii, Yueii V., Musaev, Djmaladdin G., Luznetsov, Aleksey E., Hardcastle, Ken I., Hill, Craig L.
Source:	Science (pre-March 2025). 4/16/2010, Vol. 328 Issue 5976, p342-345. 4p.
Subjects:	Catalysts, Renewable energy source research, Oxidation, Complex compounds, Cobalt compounds, Tungstates, Ligands (Chemistry), pH effect
Abstract:	Traditional homogeneous water oxidation catalysts are plagued by instability under the reaction conditions. We report that the complex [Co4(H20)2(PW9O342]10-, comprising a Co404 core stabilized by oxidatively resistant polytungstate ligands, is a hydrolytically and oxidatively stable homogeneous water oxidation catalyst that self-assembles in water from salts of earth-abundant elements (Co, W, and P). With [Ru(bpy)3]3+ (bpy is 2,2'-bipyridine) as the oxidant, we observe catalytic turnover frequencies for O2 production ≥5 s-1 at pH = 8. The rate's pH sensitivity reflects the pH dependence of the four-electron O2-H2O couple. Extensive spectroscopic, electrochemical, and inhibition studies firmly indicate that [C04(H20)2(PW9034)2]10- is stable under catalytic turnover conditions: Neither hydrated cobalt ions nor cobalt hydroxide/oxide particles form in situ. [ABSTRACT FROM AUTHOR]
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Database:	Psychology and Behavioral Sciences Collection

Description
Abstract:	Traditional homogeneous water oxidation catalysts are plagued by instability under the reaction conditions. We report that the complex [Co4(H20)2(PW9O342]10-, comprising a Co404 core stabilized by oxidatively resistant polytungstate ligands, is a hydrolytically and oxidatively stable homogeneous water oxidation catalyst that self-assembles in water from salts of earth-abundant elements (Co, W, and P). With [Ru(bpy)3]3+ (bpy is 2,2'-bipyridine) as the oxidant, we observe catalytic turnover frequencies for O2 production ≥5 s-1 at pH = 8. The rate's pH sensitivity reflects the pH dependence of the four-electron O2-H2O couple. Extensive spectroscopic, electrochemical, and inhibition studies firmly indicate that [C04(H20)2(PW9034)2]10- is stable under catalytic turnover conditions: Neither hydrated cobalt ions nor cobalt hydroxide/oxide particles form in situ. [ABSTRACT FROM AUTHOR]
ISSN:	00368075
DOI:	10.1126/science.1185372