Alloying–realloying enabled high durability for Pt–Pd-3d-transition metal nanoparticle fuel cell catalysts

Zhi Peng Wu, Dominic T. Caracciolo, Yazan Maswadeh, Jianguo Wen, Zhijie Kong, Shiyao Shan, Jorge A. Vargas, Shan Yan, Emma Hopkins, Keonwoo Park, Anju Sharma, Yang Ren, Valeri Petkov, Lichang Wang, Chuan Jian Zhong

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

Alloying noble metals with non-noble metals enables high activity while reducing the cost of electrocatalysts in fuel cells. However, under fuel cell operating conditions, state-of-the-art oxygen reduction reaction alloy catalysts either feature high atomic percentages of noble metals (>70%) with limited durability or show poor durability when lower percentages of noble metals (<50%) are used. Here, we demonstrate a highly-durable alloy catalyst derived by alloying PtPd (<50%) with 3d-transition metals (Cu, Ni or Co) in ternary compositions. The origin of the high durability is probed by in-situ/operando high-energy synchrotron X-ray diffraction coupled with pair distribution function analysis of atomic phase structures and strains, revealing an important role of realloying in the compressively-strained single-phase alloy state despite the occurrence of dealloying. The implication of the finding, a striking departure from previous perceptions of phase-segregated noble metal skin or complete dealloying of non-noble metals, is the fulfilling of the promise of alloy catalysts for mass commercialization of fuel cells.

Original languageEnglish
Article number859
JournalNature Communications
Volume12
Issue number1
DOIs
StatePublished - Dec 1 2021

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