Pd@Pt core-shell tetrapods as highly active and stable electrocatalysts for the oxygen reduction reaction

被引:74
作者
Zhao, Ruopeng [2 ]
Liu, Yi [2 ]
Liu, Chang [2 ]
Xu, Guangrui [1 ]
Chen, Yu [1 ]
Tang, Yawen [2 ]
Lu, Tianhong [2 ]
机构
[1] Shaanxi Normal Univ, Sch Mat Sci & Engn, Xian 710062, Peoples R China
[2] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Jiangsu, Peoples R China
关键词
PLATINUM; PERFORMANCE; NANOPARTICLES; NANOSTRUCTURES; NANOCRYSTALS; OVERGROWTH; STABILITY; NANOTUBES; CATALYSTS;
D O I
10.1039/c4ta04917a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Enhancing the electrocatalytic activity and stability of cathodic Pt electrocatalysts in proton exchange membrane fuel cells is an attractive research topic because of the importance of the oxygen reduction reaction (ORR) in PEMFCs. In this work, Pd@Pt core-shell tetrapods (CSNTPs) are prepared by a facile seeded growth process. During the synthesis, Pd tetrapods act as seeds to guide the growth of the dendritic Pt shell. Various physical techniques confirm that the as-prepared Pd@Pt CSNTPs have a core-shell structure and surface dendritic morphology. Moreover, the electrocatalytic activity and durability of the Pd@Pt CSNTPs for the ORR in acidic media were systemically studied by various electrochemical techniques such as cyclic voltammetry, ORR polarization measurements, and accelerated durability test (ADT). After an 8000 cycle ADT, Pd@Pt CSNTPs only lose 13% of their initial electrochemical surface area, whereas commercial Pt black loses 78%. Compared to Pt black, Pd@Pt CSNTPs show remarkably enhanced electrocatalytic activity and durability for the ORR owing to their specific structural characteristics and the synergistic effect between the Pt shell and Pd core.
引用
收藏
页码:20855 / 20860
页数:6
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