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  Nanostructured Manganese Oxide Supported on Carbon Nanotubes for Electrocatalytic Water Splitting

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.

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 Creators:
Mette, Katharina1, Author           
Bergmann, Arno2, Author
Tessonnier, Jean-Philippe1, 3, Author           
Hävecker, Michael1, 4, Author           
Yao, Lide1, Author           
Ressler, Thorsten5, Author           
Schlögl, Robert1, Author           
Strasser, Peter2, Author
Behrens, Malte1, Author           
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Department of Chemistry, Chemical and Materials Engineering Division, The Electrochemical Energy, Catalysis and Materials Science Laboratory, Technische Universität Berlin, Strasse des 17. Juni 124, 10623 Berlin (Germany), ou_persistent22              
3Department of Chemical Engineering, University of Delaware, 150 Academy Street, Newark, DE 19716 (USA), ou_persistent22              
4Helmholtz-Zentrum Berlin fuer Materialien und Energy GmbH, Division Solar Energy Research, Elektronenspeicherring BESSY II, ou_persistent22              
5Department of Chemistry, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin (Germany), ou_persistent22              

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Free keywords: carbon nanotubes;catalyst preparation; electrocatalysis; manganese oxide; oxygen evolution reaction
 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.

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Language(s): eng - English
 Dates: 2012-03-202012-06
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/cctc.201100434
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Title: ChemCatChem : heterogeneous & homogeneous & bio-catalysis
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 4 (6) Sequence Number: - Start / End Page: 851 - 862 Identifier: Other: 1867-3880
CoNE: https://pure.mpg.de/cone/journals/resource/1867-3880