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Nanostructured Manganese Oxide Supported on Carbon Nanotubes for Electrocatalytic Water Splitting

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons21873

Mette,  Katharina
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22164

Tessonnier,  Jean-Philippe
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Chemical Engineering, University of Delaware;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21590

Hävecker,  Michael
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Helmholtz-Zentrum Berlin fuer Materialien und Energy GmbH, Division Solar Energy Research, Elektronenspeicherring BESSY II;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22269

Yao,  Lide
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22071

Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21347

Behrens,  Malte
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Mette, K., Bergmann, A., Tessonnier, J.-P., Hävecker, M., Yao, L., Ressler, T., et al. (2012). Nanostructured Manganese Oxide Supported on Carbon Nanotubes for Electrocatalytic Water Splitting. ChemCatChem: heterogeneous & homogeneous & bio-catalysis, 4(6), 851-862. doi:10.1002/cctc.201100434.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-C6F8-3
Abstract
Incipient wetness impregnation and a novel deposition symproportionation precipitation were used for the preparation of MnOx/CNT electrocatalysts for efficient water splitting. Nanostructured manganese oxides have been dispersed on commercial carbon nanotubes as a result of both preparation methods. A strong influence of the preparation history on the electrocatalytic performance was observed. The as-prepared state of a 6.5 wt. % MnOx/CNT sample could be comprehensively characterized by comparison to an unsupported MnOx reference sample. Various characterization techniques revealed distinct differences in the oxidation state of the Mn centers in the as-prepared samples as a result of the two different preparation methods. As expected, the oxidation state is higher and near +4 for the symproportionated MnOx compared to the impregnated sample, where +2 was found. In both cases an easy adjustability of the oxidation state of Mn by post-treatment of the catalysts was observed as a function of oxygen partial pressure and temperature. Similar adjustments of the oxidation state are also expected to happen under water splitting conditions. In particular, the 5 wt. % MnO/CNT sample obtained by conventional impregnation was identified as a promising catalytic anode material for water electrolysis at neutral pH showing high activity and stability. Importantly, this catalytic material is comparable to state-of-art MnOx catalyst operating in strongly alkaline solutions and, therefore, offers advantages for hydrogen production from waste and sea water under neutral, hence, environmentally benign conditions.