• 文献标题:   Promotional Effect of Fe Impurities in Graphene Precursors on the Activity of MnOX/Graphene Electrocatalysts for the Oxygen Evolution and Oxygen Reduction Reactions
  • 文献类型:   Article
  • 作  者:   MORALES DM, MASA J, ANDRONESCU C, SCHUHMANN W
  • 作者关键词:   oxygen evolution reaction, oxygen reduction reaction, fe impuritie, graphene, manganese oxide
  • 出版物名称:   CHEMELECTROCHEM
  • ISSN:   2196-0216
  • 通讯作者地址:   Ruhr Univ Bochum
  • 被引频次:   5
  • DOI:   10.1002/celc.201700496
  • 出版年:   2017

▎ 摘  要

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.