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Nat Commun. 2014 Jul 30;5:4470. doi: 10.1038/ncomms5470.

Robust carbon dioxide reduction on molybdenum disulphide edges.

Author information

1
1] Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA [2].
2
Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA.
3
Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
4
Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA.
5
Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA.
6
Dioxide Materials, Champaign, Illinois 61820, USA.
7
Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
8
1] Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA [2] Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA.

Abstract

Electrochemical reduction of carbon dioxide has been recognized as an efficient way to convert carbon dioxide to energy-rich products. Noble metals (for example, gold and silver) have been demonstrated to reduce carbon dioxide at moderate rates and low overpotentials. Nevertheless, the development of inexpensive systems with an efficient carbon dioxide reduction capability remains a challenge. Here we identify molybdenum disulphide as a promising cost-effective substitute for noble metal catalysts. We uncover that molybdenum disulphide shows superior carbon dioxide reduction performance compared with the noble metals with a high current density and low overpotential (54 mV) in an ionic liquid. Scanning transmission electron microscopy analysis and first principle modelling reveal that the molybdenum-terminated edges of molybdenum disulphide are mainly responsible for its catalytic performance due to their metallic character and a high d-electron density. This is further experimentally supported by the carbon dioxide reduction performance of vertically aligned molybdenum disulphide.

PMID:
25073814
DOI:
10.1038/ncomms5470

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