Reshaping the Cathodic Catalyst Layer for Anion Exchange Membrane Fuel Cells: from Heterogeneous Catalysis to Homogeneous Catalysis.
Reshaping the Cathodic Catalyst Layer for Anion Exchange Membrane Fuel Cells: from Heterogeneous Catalysis to Homogeneous Catalysis.
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DOI：
10.1002/anie.202012547
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发表时间：
2020-11
影响因子：
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通讯作者：
R. Ren;Xiaojiang Wang;Hengquan Chen;H. Miller;Ihtasham Salam;J. Varcoe;Liang Wu;You-jiang Chen;H. Liao;Ershuai Liu;F. Bartoli;F. Vizza;Q. Jia;Qinggang He
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文献类型：
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作者：
R. Ren;Xiaojiang Wang;Hengquan Chen;H. Miller;Ihtasham Salam;J. Varcoe;Liang Wu;You-jiang Chen;H. Liao;Ershuai Liu;F. Bartoli;F. Vizza;Q. Jia;Qinggang He
在阴离子交换膜燃料电池中，催化反应发生在明确限定的三相界面处，其中常规的非均相催化剂层结构加剧了诸如低催化剂利用率和有限的传质的问题。我们开发了一种结构工程策略，将分子催化剂四（4-甲氧基苯基）卟啉钴（II）（TMPPCo）固定在离聚物（聚芴，PF）的侧链上，以获得复合材料（PF-TMPPCo），从而在离子流通道内实现均匀的催化环境，由于100%利用催化剂分子，大大提高了传质和周转频率。由互连纳米反应器组成的均相催化体系的独特的全新结构表现出低过电位和高燃料电池功率密度的优点。这种催化剂层结构的重塑策略可以作为许多分子催化剂在燃料电池中应用的新平台。
In anion exchange membrane fuel cells, catalytic reactions occur at a well-defined three-phase interface, wherein conventional heterogeneous catalyst layer structures exacerbate problems such as low catalyst utilization and limited mass transfer. We developed a structural engineering strategy to immobilize a molecular catalyst tetrakis(4-methoxyphenyl)porphyrin cobalt(II) (TMPPCo) on the side chains of an ionomer (polyfluorene, PF) to obtain a composite material (PF-TMPPCo), thereby achieving a homogeneous catalysis environment inside ion flow channels, with greatly improved mass transfer and turnover frequency due to 100% utilization of the catalyst molecules. The unique brand-new structure of the homogeneous catalysis system comprising interconnected nanoreactors exhibits advantages of low overpotential and high fuel cell power density. This strategy of reshaping of the catalyst layer structure may serve as a new platform for applications of many molecular catalysts in fuel cells.