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Microstructural Transformations of La 0.6 Sr 0.4 MnO 3 to nNano-layered Mn Oxide during Electrochemical Water Oxidation

Hydrogen produced from water splitting by electrolysis is very attractive as a renewable energy source to replace fossil fuels [1]. In the past three decades, the use of artificial photocatalytic systems for water splitting has proven to be a favorable way of producing hydrogen from renewable resources [2]. The oxidation of water to oxygen is the most challenging part of the water splitting reaction because of the thermodynamic and kinetic limitations [3]. In order to promote this reaction, a variety of different metal oxide compounds have been developed as water oxidizing catalysts, however many of these compounds suffer from severe drawbacks such as toxicity, price, and limited availability that have prevented their widespread application [4]. Among the candidate metal oxides, manganese oxide compounds have attracted significant attention, not only because they are stable and earth abundant, but also because they are cost efficient.