Ultralow-loading platinum-cobalt fuel cell catalysts derived from imidazolate frameworks
Ultralow-loading platinum-cobalt fuel cell catalysts derived from imidazolate frameworks
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DOI：
10.1126/science.aau0630
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发表时间：
2018-12-14
期刊：
影响因子：
56.9
通讯作者：
Liu, Di-Jia
中科院分区：
文献类型：
--
作者：
Chong, Lina;Wen, Jianguo;Liu, Di-Jia
以尽可能少的铂量实现高催化性能对于降低燃料电池成本至关重要。在这里，我们描述了一种制备高活性但稳定的电催化剂的方法，含有超低负载量的铂含量，通过使用钴或钴和锌沸石咪唑骨架作为前体。应变铂钴核壳纳米粒子之间的协同催化铂族金属（PGM）的自由催化基板导致优异的燃料电池性能下1大气压的O-2或空气在高电压和高电流域。两种催化剂实现了每毫克铂1.08安培（A mg（Pt）（-1））和1.77 A mg（Pt）（-1）的氧还原反应（ORR）质量活性，并且在燃料电池中30，000次电压循环后保持了初始值的64%和15%。计算建模表明，铂-钴纳米颗粒与无PGM位点之间的相互作用改善了ORR活性和耐久性。
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 O-2 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 mg(Pt)(-1)) and 1.77 A mg(Pt)(-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.