Phosphorylated manganese oxide electrodeposited from ionic liquid as a stable, high efficiency water oxidation catalyst

Izgorodin, Alex, Hocking, Rosalie, Winther-Jensen, Orawan, Hilder, Matthias, Winther-Jensen, Bjorn, and MacFarlane, Douglas R. (2013) Phosphorylated manganese oxide electrodeposited from ionic liquid as a stable, high efficiency water oxidation catalyst. Catalysis Today, 200. pp. 36-40.

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Abstract

Efficient production of hydrogen via water splitting is an important goal that would represent a significant step towards truly sustainable supplies of energy. However, currently available catalysts for water electrolysis are either too low in efficiency or too unstable to be practical in this context. Recognizing the very high stability of manganese phosphate, we describe here a novel catalyst material based on manganese oxide that is both stabilized and sensitized by a surface phosphorylation reaction in an ionic liquid electrodeposition process. XPS and EXAFS data show that the surface of the MnOₓ contains phosphorous at P to Mn ratio of similar to 1:2, indicating that the surface layer contains both phosphate characteristics and oxide characteristics. The catalyst stability was significantly enhanced compared to the previously reported manganese oxide catalysts and more than 25 h of continuous water oxidation is demonstrated.

Item ID: 28913
Item Type: Article (Research - C1)
ISSN: 1873-4308
Keywords: ionic liquid, water oxidation, manganese (IV) oxide
Funders: Australian Research Council (ARC)
Date Deposited: 21 Aug 2013 09:22
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030201 Bioinorganic Chemistry @ 100%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850504 Solar-Photovoltaic Energy @ 50%
97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 50%
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