Ultrathin PtNiM (M = Rh, Os, and Ir) Nanowires as Efficient Fuel Oxidation Electrocatalytic Materials

Weiyu Zhang, Yong Yang, Bolong Huang, Fan Lv, Kai Wang, Na Li, Mingchuan Luo, Yuguang Chao, Yingjie Li, Yingjun Sun, Zhikun Xu, Yingnan Qin, Wenxiu Yang, Jinhui Zhou, Yaping Du, Dong Su, Shaojun Guo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

74 Citations (Scopus)

Abstract

The development of new electrocatalysts with high activity and durability for alcohol oxidation is an emerging need of direct alcohol fuel cells. However, the commonly used Pt-based catalysts still exhibit drawbacks including limited catalytic activity, high overpotential, and severe CO poisoning. Here a general approach is reported for preparing ultrathin PtNiM (M = Rh, Os, and Ir) nanowires (NWs) with excellent anti-CO-poisoning ability and high activity. Owing to their superior nanostructure and optimal electronic interaction, the ultrathin PtNiM NWs show enhanced electrocatalytic performance for both methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR). The optimal PtNiRh NWs show mass activity of 1.72 A mg −1 and specific activity of 2.49 mA cm −2 for MOR, which are 3.17 and 2.79 times higher than those of Pt/C. In particular, the onset potentials of PtNiRh NWs for MOR and EOR shift down by about 65 and 85 mV compared with those of Pt/C. Density functional theory calculations further verify their high antipoison properties for MOR and EOR from both an electronic and energetic perspective. Facilitated by the introduction of Rh and Ni, the stable pinning of the Pt 5d band associated with electron-rich and depletion centers solves the dilemma between reactivity and anti-CO poisoning.

Original languageEnglish
Article number1805833
JournalAdvanced Materials
Volume31
Issue number15
DOIs
Publication statusPublished - 12 Apr 2019

Keywords

  • bifunctional mechanism
  • electrocatalysis
  • ethanol oxidation reaction
  • methanol oxidation reaction
  • ultrathin nanowires

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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