Phase conversion of Pt3Ni2/C from disordered alloy to ordered intermetallic with strained lattice for oxygen reduction reaction

Lingxuan Chen, Jing Zhu, Jie Wang, Weiping Xiao, Wen Lei, Tonghui Zhao, Ting Huang, Ye Zhu, Deli Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)

Abstract

Tuning the surface strain and atom arrangement to control the surface chemistry process is one of efficient strategies to enhance the electrocatalytic performance of nanomaterials. This research introduces an ordered Pt3Ni2/C intermetallic nanoparticle as a new type of the Pt-Ni system for the ORR, which is rarely reported at present. Besides, it focuses on the phase conversion of Pt3Ni2/C nanocatalysts from a disordered phase to an ordered phase. X-ray diffraction (XRD) and transmission electron microscopy (TEM) measurements confirm the formation of ordered face-centered cubic (fcc) type Pt3Ni2/C nanocatalysts with homogeneous particle distribution and average crystallite size of 6.4 nm. The ordered fcc-Pt3Ni2/C exhibits improved electrocatalytic activities toward the oxygen reduction reaction (ORR) in 0.1 M HClO4 and 0.1 M KOH electrolyte when compared with Pt3Ni2/C disordered alloy. Besides, the robust ordered fcc-Pt3Ni2/C showed a smaller activity loss after durability tests in alkaline medium than acid electrolyte. The improved ORR activity and stability could be ascribed to the surface atom arrangement and reasonable surface strain originated from the ordered structure of Pt3Ni2/C nanoparticles relative to the disordered Pt3Ni2/C alloy, forcefully demonstrating that the Pt3Ni2/C intermetallic compound may act as highly efficient ORR electrocatalysts in energy conversion process.

Original languageEnglish
Pages (from-to)1253-1260
Number of pages8
JournalElectrochimica Acta
Volume283
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • Durability
  • Ordered intermetallic
  • Oxygen reduction reaction
  • PtNi/C catalyst

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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