质子交换膜燃料电池
双金属片
催化作用
电催化剂
材料科学
化学工程
铂金
热解
阴极
沸石咪唑盐骨架
纳米颗粒
碳纤维
合金
咪唑酯
纳米技术
化学
复合材料
电化学
电极
金属有机骨架
有机化学
吸附
物理化学
工程类
复合数
作者
Saadia Hanif,Xuan Shi,Naseem Iqbal,Tayyaba Nооr,Rehan Anwar,A.M. Kannan
标识
DOI:10.1016/j.apcatb.2019.117947
摘要
High performance cathode catalysts with minimum platinum amount for the electrocatalyzed oxygen reduction reaction (ORR) in PEMFCs remain as a significant challenge for commercial application. Zeolitic Imidazolate Framework (ZIF) based catalyst can provide void 3D framework of N-doped nano-porous carbon for promising ORR activity. Here we report a bimetallic pyrolyzed NiCo-ZIF supported fine Pt/Pt alloy electrocatalyst for ORR. After pyrolysis, nano-porous carbon is obtained with well dispersed Pt/Pt alloy nanoparticles (˜ 3 nm). This catalyst shows superior performance and stability in acidic medium against the commercial catalyst comprising of Pt/C. In a single cell PEMFC, high peak power density value of 1067 mW. cm−2 is attained at 70 °C by using low platinum amount of 0.12 mg cm-2 on cathode. The enhanced activity and durability is credited to the synergistic impact of N-doped nano-porous carbon originated from NiCo-ZIF and the defect rich carbon support to anchor Pt/Pt alloy nanoparticles.
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