Reshaping the Cathodic Catalyst Layer for Anion Exchange Membrane Fuel Cells: From Heterogeneous Catalysis to Homogeneous Catalysis,Angewandte Chemie International Edition

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Reshaping the Cathodic Catalyst Layer for Anion Exchange Membrane Fuel Cells: From Heterogeneous Catalysis to Homogeneous Catalysis
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-11-13 , DOI: 10.1002/anie.202012547
Rong Ren ₁ , Xiaojiang Wang ₁ , Hengquan Chen ₁ , Hamish Andrew Miller ₂ , Ihtasham Salam ₃ , John Robert Varcoe ₃ , Liang Wu ₄ , Youhu Chen ₅ , Hong‐Gang Liao ₅ , Ershuai Liu ₆ , Francesco Bartoli ₂ , Francesco Vizza ₂ , Qingying Jia ₆ , Qinggang He _{1,

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Affiliation

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 as a result of 100 % utilization of the catalyst molecules. The unique 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.

中文翻译：

重塑阴离子交换膜燃料电池的阴极催化剂层：从非均相催化到均相催化

在阴离子交换膜燃料电池中，催化反应发生在明确定义的三相界面上，其中传统的非均相催化剂层结构加剧了问题，例如催化剂利用率低和传质受限。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），从而实现了离子流通道内部的均相催化环境，由于100％利用了催化剂分子，因此大大提高了传质和转换频率。包含相互连接的纳米反应器的均相催化系统的独特结构具有低超电势和高燃料电池功率密度的优势。

更新日期：2020-11-13

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