贵金属
耐久性
催化作用
材料科学
合金
纳米颗粒
化学工程
三元运算
过渡金属
相(物质)
冶金
金属
纳米技术
化学
复合材料
工程类
生物化学
有机化学
程序设计语言
计算机科学
作者
Zhi Peng Wu,Dominic Caracciolo,Yazan Maswadeh,Jianguo Wen,Zhi Hui Kong,Shiyao Shan,Jorge Vargas,Shan Yan,Emma Hopkins,Keonwoo Park,Anju Sharma,Yang Ren,Valeri Petkov,Lichang Wang,Chuan‐Jian Zhong
标识
DOI:10.1038/s41467-021-21017-6
摘要
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.
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