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Inorganics 2015, 3(3), 332-340;

Activity and Stability of the Tetramanganese Polyanion [Mn4(H2O)2(PW9O34)2]10— during Electrocatalytic Water Oxidation

Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain
Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluis Companys, 23, E-08010 Barcelona, Spain
Author to whom correspondence should be addressed.
Academic Editors: Greta Ricarda Patzke and Pierre-Emmanuel Car
Received: 14 April 2015 / Revised: 16 June 2015 / Accepted: 19 June 2015 / Published: 8 July 2015
(This article belongs to the Special Issue Polyoxometalates)
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In natural photosynthesis, the oxygen evolving center is a tetranuclear manganese cluster stabilized by amino acids, water molecules and counter ions. However, manganese complexes are rarely exhibiting catalytic activity in water oxidation conditions. This is also true for the family of water oxidation catalysts (WOCs) obtained from POM chemistry. We have studied the activity of the tetranuclear manganese POM [Mn4(H2O)2(PW9O34)2]10—(Mn4), the manganese analog of the well-studied [Co4(H2O)2(PW9O34)2]10— (Co4), one of the fastest and most interesting WOC candidates discovered up to date. Our electrocatalytic experiments indicate that Mn4 is indeed an active water oxidation catalysts, although unstable. It rapidly decomposes in water oxidation conditions. Bulk water electrocatalysis shows initial activities comparable to those of the cobalt counterpart, but in this case current density decreases very rapidly to become negligible just after 30 min, with the appearance of an inactive manganese oxide layer on the electrode. View Full-Text
Keywords: polyoxometalates; electrocatalysis; water oxidation polyoxometalates; electrocatalysis; water oxidation

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Goberna-Ferrón, S.; Soriano-López, J.; Galán-Mascarós, J.R. Activity and Stability of the Tetramanganese Polyanion [Mn4(H2O)2(PW9O34)2]10— during Electrocatalytic Water Oxidation. Inorganics 2015, 3, 332-340.

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