Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 47, Pages 11098-11104Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201901400
Keywords
electrocatalysis; electrochemistry; organic-inorganic hybrid composites; oxygen evolution; polyoxometalates
Categories
Funding
- Ulm University
- Deutsche Forschungsgemeinschaft [STR1164/4, STR1164/12, TRR234]
- Helmholtz-Institute Ulm (HIU)
- National Natural Science Foundation of China [91545125]
- Chinese Academy of Sciences President's International Fellowship Initiative [2018VMA0041]
- China Scholarship Council (CSC)
- Graphene Flagship
- DFG
- Ministry of Science, Research and the Arts (MWK) of Baden-Wuerttemberg
- Alexander-von-Humboldt-Foundation
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The rapid development of renewable-energy technologies such as water splitting, rechargeable metal-air batteries, and fuel cells requires highly efficient electrocatalysts capable of the oxygen-reduction reaction (ORR) and the oxygen-evolution reaction (OER). Herein, we report a facile sonication-driven synthesis to deposit the molecular manganese vanadium oxide precursor [Mn4V4O17(OAc)(3)](3-) on multiwalled carbon nanotubes (MWCNTs). Thermal conversion of this composite at 900 degrees C gives nanostructured manganese vanadium oxides/carbides, which are stably linked to the MWCNTs. The resulting composites show excellent electrochemical reactivity for ORR and OER, and significant reactivity enhancements compared with the precursors and a Pt/C reference are reported. Notably, even under harsh acidic conditions, long-term OER activity at low overpotential is reported. In addition, we report exceptional activity of the composites for the industrially important Cl-2 evolution from an aqueous HCl electrolyte. The new composite material shows how molecular deposition routes leading to highly active and stable multifunctional electrocatalysts can be developed. The facile design could in principle be extended to multiple catalyst classes by tuning of the molecular metal oxide precursor employed.
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