耐久性
材料科学
铂金
氧还原
还原(数学)
氧还原反应
氧气
复合材料
化学工程
纳米技术
催化作用
电化学
电极
生物化学
化学
几何学
数学
有机化学
物理化学
工程类
作者
Mingkai Liu,Siyu Zhou,Marc Figueras,Yong Ding,Zhiheng Lyu,Manos Mavrikakis,Younan Xia
标识
DOI:10.1002/adfm.202404677
摘要
Abstract The synthesis of cone‐shaped Pt nanoparticles featuring compressively‐strained {111} facets by depositing Pt atoms on the vertices of Pd icosahedral nanocrystals, followed by selective removal of the Pd template via wet etching, is reported. By controlling the lateral dimensions down to ca. 3 nm, together with a thickness of ca. 2 nm, the Pt cones show greatly enhanced specific and mass activities toward oxygen reduction, with values being 2.8 and 6.4 times those of commercial Pt/C, respectively. Both the strain field and the observed activity trend are rationalized using density functional theory calculations. With the formation of ultrathin linkers among the Pt cones derived from the same Pd icosahedral seed, the interconnected Pt cones acquire stronger interactions with the carbon support, preventing them from detachment and aggregation during the catalytic reaction. Even after 20 000 cycles of accelerated durability test, the Pt cones still show a mass activity 5.3 times higher than the initial value of the Pt/C.
科研通智能强力驱动
Strongly Powered by AbleSci AI