Octahedral PtNi nanoparticles with controlled surface structure and composition for oxygen reduction reaction

作     者：逯一中 Larissa Thia Adrian Fisher Chi-Young Jung Sung Chul Yi 王昕 

作者机构：School of Chemical and Biomedical EngineeringNanyang Technological UniversitySingapore 639798Singapore Cambridge Centre of Advanced Research in Energy Eficiency in Singapore(CARES)Singapore 138602Singapore Department of Chemical Engineering and BiotechnologyUniversity of CambridgeNew Museums SitePembroke StreetCambridgeCB2 3RA(UK). Department of Chemical EngineeringHanyang UniversityHaengdang·dongSeongdong-guSeoul 133-791Republic of Korea 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2017年第60卷第11期

页      面：1109-1120页

核心收录：

学科分类：081705[工学-工业催化] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Research Foundation,Prime Minister’s Office,Singapore under its CREATE Programme financial support by the Defence Acquisition Program Administration and Agency for Defence Development(UD120080GD),Republic of Korea 

主　　题：PtNi octahedral concave surface structure oxygenreduction reaction 

摘      要：Controlling the surface structure and composi- tion at the atomic level is an effective way to tune the cat- alytic properties of bimetallic catalysts. Herein, we demon- strate a generalized strategy to synthesize highly monodis- perse, surfactant-free octahedral PtxNi1-x nanoparticles with tunable surface structure and composition. With increasing the Ni content in the bulk composition, the degree of concave- ness of the octahedral PtxNi1-x nanoparticles increases. We systematically studied the correlation between their surface structure/composition and their observed oxygen reduction activity. Electrochemical studies have shown that all the octa- hedral PtxNi1-x nanoparticles exhibit enhanced oxygen reduc- tion activity relative to the state-of-the-art commercial Pt/C catalyst. More importantly, we find that the surface struc- ture and composition of the octahedral PtxNi1-x nanoparti- cles have significant effect on their oxygen reduction activ- ity. Among the studied PtxNi1-x nanoparticles, the octahedral PtlNi1 nauoparticles with slight concaveness in its （111） facet show the highest activity. At 0.90 V vs. RHE, the Pt mass and specific activity of the octahedral PhNil nanoparticles are 7.0 and 7.5-fold higher than that of commercial Pt/C catalyst, re- spectively. The present work not only provides a generalized strategy to synthesize highly monodisperse, surfactant-free octahedral PtxNi1-x nanoparticles with tunable surface struc- ture and composition, but also provides insights to the struc- ture-activity correlation.