催化作用
沸石咪唑盐骨架
双金属片
铂金
钴
咪唑酯
化学工程
材料科学
纳米颗粒
金属有机骨架
化学
无机化学
纳米技术
有机化学
吸附
工程类
作者
Lina Chong,Jianguo Wen,Joseph Kubal,Fatih Şen,Jianxin Zou,Jeffery P. Greeley,Maria K. Y. Chan,Heather Barkholtz,Wenjiang Ding,Di-Jia Liu
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2018-12-14
卷期号:362 (6420): 1276-1281
被引量:722
标识
DOI:10.1126/science.aau0630
摘要
Achieving high catalytic performance with the lowest possible amount of platinum is critical for fuel cell cost reduction. Here we describe a method of preparing highly active yet stable electrocatalysts containing ultralow-loading platinum content by using cobalt or bimetallic cobalt and zinc zeolitic imidazolate frameworks as precursors. Synergistic catalysis between strained platinum-cobalt core-shell nanoparticles over a platinum-group metal (PGM)-free catalytic substrate led to excellent fuel cell performance under 1 atmosphere of O2 or air at both high-voltage and high-current domains. Two catalysts achieved oxygen reduction reaction (ORR) mass activities of 1.08 amperes per milligram of platinum (A mgPt-1) and 1.77 A mgPt-1 and retained 64% and 15% of initial values after 30,000 voltage cycles in a fuel cell. Computational modeling reveals that the interaction between platinum-cobalt nanoparticles and PGM-free sites improves ORR activity and durability.
科研通智能强力驱动
Strongly Powered by AbleSci AI