Optimizing PtFe intermetallics for oxygen reduction reaction: From DFT screening to: In situ XAFS characterization

Mingxing Gong, Jing Zhu, Mingjie Liu, Peifang Liu, Zhiping Deng, Tao Shen, Tonghui Zhao, Ruoqian Lin, Yun Lu, Shize Yang, Zhixiu Liang, Seong Min Bak, Eli Stavitski, Qin Wu, Radoslav R. Adzic, Huolin L. Xin, Deli Wang

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Rational designing of catalysts to promote the sluggish kinetics of the cathode oxygen reduction reaction in proton exchange membrane fuel cells is still challenging, yet of crucial importance to its commercial application. In this work, on the basis of theoretical DFT calculations which suggest that order structured fct-phased PtFe (O-PtFe) with an atomic Pt shell exhibits superior electrocatalytic performance towards the ORR, the desired structure was prepared by using a scalable impregnation-reduction method. The as-prepared O-PtFe delivered enhanced activity (0.68 A mg-1Pt) and stability (73% activity retention after 10000 potential cycles) compared with the corresponding disordered PtFe alloy (D-PtFe) and Pt. To confirm the excellent durability, in situ X-ray absorption fine structure spectroscopy was conducted to probe the local and electronic structure changes of O-PtFe during 10000 cycle accelerated durability testing. We hope that this facile synthesis method and the in situ XAFS experiment could be readily adapted to other catalyst systems, facilitating the screening of highly efficient ORR catalysts for fuel cell application.

Original languageEnglish
Pages (from-to)20301-20306
Number of pages6
JournalNanoscale
Volume11
Issue number42
DOIs
Publication statusPublished - 2019 Nov 14

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2019.

All Science Journal Classification (ASJC) codes

  • General Materials Science

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