{"title":"Gas-Pressure-Driven\u0000Phase Engineering of PdZn Ordered\u0000Intermetallics for Enhanced Oxygen Reduction Electrocatalysis","authors":"Jiabing Yan,Pei Zhang,Xing Hu,Yibo Liu,Hao Han,Ruifan Li,Yanan Feng,Shan Zhu,Kezhu Jiang,Shijian Zheng","doi":"10.1021/acs.nanolett.6c03757","DOIUrl":"https://doi.org/10.1021/acs.nanolett.6c03757","url":null,"abstract":"Abstract Precise phase engineering at the atomic scale is central to advanced catalyst design, yet controlling high-temperature phase transitions remains challenging because of large kinetic barriers. Here, we report a gas-pressure-induced strategy that establishes gas pressure as an independent dimension for nanoscale phase engineering. Mechanistic studies reveal that modulating the gas-phase diffusion coefficient via the gas pressure can control the structural evolution of crystal phases. As a demonstration of this methodology, an optimal pressure effectively overcomes high-temperature constraints and retards the escape of volatile species, enabling the precise construction of phase-pure ordered PdZn intermetallics. This strategy extends to ternary PdZnCu ordered alloys, inducing significant compressive strain while preserving the long-range ordered lattice. The resulting catalyst delivers a high oxygen reduction mass activity of 1.09 A mgPd–1 and long-term durability over 30 000 cycles. This gas-pressure-induced approach circumvents conventional thermodynamic and kinetic constraints, providing a pathway for the design of advanced intermetallic catalysts.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"16 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}