• 文献标题:   Use of graphene-supported manganite nano-composites for methanol electrooxidation
  • 文献类型:   Article
  • 作  者:   SHARMA CS, SINHA ASK, SINGH RN
  • 作者关键词:   hybrid material, nanocomposite, methanol oxidation, direct methanol fuel cell
  • 出版物名称:   INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • ISSN:   0360-3199 EI 1879-3487
  • 通讯作者地址:   Banaras Hindu Univ
  • 被引频次:   6
  • DOI:   10.1016/j.ijhydene.2014.10.019
  • 出版年:   2014

▎ 摘  要

Binary nano-composites of palladium and a metal (Fe or Cu) manganite on graphene nanosheets (GNS) have been prepared by a microwave-assisted polyol reduction method and investigated as electrocatalysts for the methanol oxidation reaction (MOR) in 1 M KOH at 25 degrees C. Structural and electrocatalytic surface characterizations of composites are carried out by X-ray diffraction, transmission electron microscopy, X-ray photoelectron microscopy, cyclic voltammetry and chronoamperometry. Results show that new composite catalysts, particularly 40 wt%Pd-x wt%FeMn2O4/GNS (where x = 5, 8, 10 & 15) are MOR active and that the activity is the greatest with the catalyst containing 8 wt% of the oxide. The composite, Pd-8 wt%FeMn2O4/GNS, exhibits much superior catalytic activity as well as stability compared to the base (Pd/GNS) electrode. The enhanced catalytic activity and stability of the Pd/GNS catalyst in presence of the oxide can be ascribed to increased population of adsorbed OH- ions/OH radicals at the electrode surface. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.