Journal
CHEMELECTROCHEM
Volume 4, Issue 11, Pages 2835-2841Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201700496
Keywords
oxygen evolution reaction; oxygen reduction reaction; Fe impurities; graphene; manganese oxide
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [EXC1069]
- Bundesministerium fur Bildung und Forschung (BMBF) [FKZ 03EK3548]
- Deutscher Akademischer Austauschdienst (DAAD)
- Consejo Nacional de Ciencia y Tecnologia (CONACyT)
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Bifunctional oxygen electrocatalysts were fabricated following a three-step synthesis method, which consisted of i) liquid-phase exfoliation of graphite in the presence of nitrogen-containing manganese macrocyclic complexes, using DMF as the dispersion medium under formation of few-layer graphene sheets. Subsequently, ii) solvent removal by vacuum filtration and drying, and iii) pyrolysis of the resulting composites under an inert gas atmosphere with subsequent mild calcination yielded manganese oxides embedded within a graphitic carbon matrix (MnOX/G). We further demonstrate that traces of Fe impurities in the used graphite result in enhanced electrocatalytic activity of the MnOX/G towards both the oxygen reduction and the oxygen evolution reactions, owing to synergistic interaction of the iron impurities with the species formed upon thermal decomposition of Mn macrocyclic complexes.
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