浙江大学化学与生物工程学院和庆刚课题组发现通过重塑阴离子交换膜燃料电池的阴极催化剂层可以提高燃料电池工作效率。 相关论文于2020年11月13日发表于《德国应用化学》。

研究人员通过一种结构工程学策略将分子催化剂四(4-甲氧苯基)钴(II)卟啉（TMPPCo）固定在一种离聚物聚芴（PF）上，制成了一种复合材料PF-TMPPCo，从而在离子流动通道内实现了一个均相催化环境，进而100%地利用了催化剂分子，极大地促进了传质和转化效率。这种具有互相连接的纳米反应器的独特的全新结构的均相催化系统，表现出较低的过电势和较高的燃料电池功率密度等优势。这一重塑催化剂层结构的策略为多种分子催化剂在燃料电池中的应用提供了一个新的平台。

据介绍，在阴离子交换膜燃料电池中，催化反应发生在一个定义明确的三相界面上，而传统异相催化剂层的结构放大了诸如较低的催化剂利用率和有限的传质速率等问题。

附：英文原文

Title: Reshaping the Cathodic Catalyst Layer for Anion Exchange Membrane Fuel Cells: from Heterogeneous Catalysis to Homogeneous Catalysis

Author: Rong Ren, Xiaojiang Wang, Hengquan Chen, Hamish Andrew Miller, Ihtasham Salam, John Robert Varcoe, Liang Wu, Youhu Chen, Hong-Gang Liao, Ershuai Liu, Francesco Bartoli, Francesco Vizza, Qingying Jia, Qinggang He

Issue&Volume: 13 November 2020

Abstract: 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.

DOI: 10.1002/anie.202012547

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202012547