Enhancement of oxygen reduction reaction activity by grain boundaries in platinum nanostructures

Enbo Zhu, Wang Xue, Shiyi Wang, Xucheng Yan, Jingxuan Zhou, Yang Liu, Jin Cai, Ershuai Liu, Qingying Jia, Xiangfeng Duan, Yujing Li, Hendrik Heinz*, Yu Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Systematic control of grain boundary densities in various platinum (Pt) nanostructures was achieved by specific peptide-assisted assembly and coagulation of nanocrystals. A positive quadratic correlation was observed between the oxygen reduction reaction (ORR) specific activities of the Pt nanostructures and the grain boundary densities on their surfaces. Compared to commercial Pt/C, the grain-boundary-rich strain-free Pt ultrathin nanoplates demonstrated a 15.5 times higher specific activity and a 13.7 times higher mass activity. Simulation studies suggested that the specific activity of ORR was proportional to the resident number and the resident time of oxygen on the catalyst surface, both of which correlate positively with grain boundary density, leading to improved ORR activities. [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)3310-3314
Number of pages5
JournalNano Research
Volume13
Issue number12
DOIs
Publication statusPublished - 1 Dec 2020

Keywords

  • grain boundaries
  • nanowire
  • oxygen reduction reaction
  • peptide

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