The “Best Catalyst” for Water Oxidation Depends on the Oxidation Method Employed: A Case Study of Manganese Oxides

Manganese oxides are a highly promising class of water-oxidation catalysts (WOCs), but the optimal MnO x formulation or polymorph is not clear from previous reports in the literature. A complication not limited to MnO x -based WOCs is that such catalysts are routinely evaluated by different methods,...

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Published inJournal of the American Chemical Society Vol. 137; no. 26; pp. 8384 - 8387
Main Authors Pokhrel, Ravi, Goetz, McKenna K, Shaner, Sarah E, Wu, Xiaoxia, Stahl, Shannon S
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 08.07.2015
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Summary:Manganese oxides are a highly promising class of water-oxidation catalysts (WOCs), but the optimal MnO x formulation or polymorph is not clear from previous reports in the literature. A complication not limited to MnO x -based WOCs is that such catalysts are routinely evaluated by different methods, ranging from the use of a chemical oxidant such as Ce4+, photoactive mediators such as [Ru­(bpy)3]2+, or electrochemical techniques. Here, we report a systematic study of nine crystalline MnO x materials as WOCs and show that the identity of the “best” catalyst changes, depending on the oxidation method used to probe the catalytic activity.
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ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.5b05093