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

Inorganics

Sara Goberna-Ferrón²  Joaquín Soriano-López²  José Ramón Galán-Mascarós²  Greta Ricarda Patzke¹ 

[1] Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain;;Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain; E-Mails:

关键词: polyoxometalates;    electrocatalysis;    water oxidation;   

DOI  :  10.3390/inorganics3030332

来源: mdpi

【 摘 要 】

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 [Mn 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.

【 授权许可】

CC BY   
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