论文类型：Research Article
第一作者：Liang,Jiashun
通讯作者：Guo,Shaojun,Li,Qing
合写作者：Huang,Yunhui,Wang,Guoxiong,Han,Jiantao,Lu,Gang,Luo,Mingchuan,Sun,Yingjun,Zhang,Siyang,Junyi,Deng,Zhi,Xu,Jia,Li,Shenzhou,Fan,Liu,Xuan,Lv,Houfu,Wan,Yangyang
发表刊物：Nature Materials
所属单位：华中科技大学
刊物所在地：英国
卷号：23
期号：9
页面范围：1259-1267
ISSN号：1476-4660
关键字：Oxygen Reduction Reaction; Total-Energy Calculations; Nanoparticles; Exchange; Transition; Catalysts; Strain; Boosts; Phase
DOI码：10.1038/s41563-024-01901-4
发表时间：2024-05-20
影响因子：37.2
摘要：Structurally ordered L10-PtM (M = Fe, Co, Ni and so on) intermetallic nanocrystals, benefiting from the chemically ordered structure and higher stability, are one of the best electrocatalysts used for fuel cells. However, their practical development is greatly plagued by the challenge that the high-temperature (>600 °C) annealing treatment necessary for realizing the ordered structure usually leads to severe particle sintering, morphology change and low ordering degree, which makes it very difficult for the gram-scale preparation of desirable PtM intermetallic nanocrystals with high Pt content for practical fuel cell applications. Here we report a new concept involving the low-melting-point-metal (M′ = Sn, Ga, In)-induced bond strength weakening strategy to reduce Ea and promote the ordering process of PtM (M = Ni, Co, Fe, Cu and Zn) alloy catalysts for a higher ordering degree. We demonstrate that the introduction of M′ can reduce the ordering temperature to extremely low temperatures (≤450 °C) and thus enable the preparation of high-Pt-content (≥40 wt%) L10-Pt-M-M′ intermetallic nanocrystals as well as ten-gram-scale production. X-ray spectroscopy studies, in situ electron microscopy and theoretical calculations reveal the fundamental mechanism of the Sn-facilitated ordering process at low temperatures, which involves weakened bond strength and consequently reduced Ea via Sn doping, the formation and fast diffusion of low-coordinated surface free atoms, and subsequent L10 nucleation. The developed L10-Ga-PtNi/C catalysts display outstanding performance in H2–air fuel cells under both light- and heavy-duty vehicle conditions. Under the latter condition, the 40% L10-Pt50Ni35Ga15/C catalyst delivers a high current density of 1.67 A cm−2 at 0.7 V and retains 80% of the current density after extended 90,000 cycles, which exceeds the United States Department of Energy performance metrics and represents among the best cathodic electrocatalysts for practical proton-exchange membrane fuel cells.