中南大学任博华团队报道了COF辅助构建立体质量电荷通道，以提高高性能燃料电池的活性。相关研究成果发表在2025年1月20日出版的《德国应用化学》。

二维层状材料分散了铂位点，最大限度地减少了燃料电池的贵金属使用，而堆叠层的质量传输阻力会导致器件失效，膜电极组件（MEA）的性能显著下降。

该文中，研究人员将多孔和刚性磺化共价有机框架（COF）植入石墨烯基催化层中，用于构建空间质电荷通道，这极大地促进了旋转盘电极（RDE）测量和MEA装置测试中氧还原反应的活性。具体而言，在RDE测试中添加合适的COF修饰后，归一化质量活度显著提高了3.7倍，达到1.56 A mgpt^-1。

特别是，在H₂/空气条件下，MEA实现了1.015 W cm^-2的优异最大功率密度，通过这种空间质量电荷通道的结构，提高了22%。同时，在10000次稳定性测试后，燃料电池的开路电压仅下降了0.8%。

研究人员进一步将这种构建质荷通道的方法，扩展到颗粒PtCo和商用Pt/C催化剂，为刺激燃料电池中的催化活性提供了重要动力。

附：英文原文

Title: COF-assisted construction of steric mass-charge channels to boost activity for high-performance fuel cells

Author: Shuangyin Wang, Guobin Wen, Liancheng Sun, Yanzhou Qin, Shengnan Liu, Luyao Ma, Ningce Zhang, Shuxuan Liu, Yan Yin, Bohua Ren

Issue&Volume: 2025-01-20

Abstract: The two-dimensional lamellar materials disperse platinum sites and minimize noble-metal usage for fuel cells, while mass transport resistance at the stacked layers spurs device failure with a significant performance decline in membrane electrode assembly (MEA). Herein, we implant porous and rigid sulfonated covalent organic frameworks (COF) into the graphene-based catalytic layer for the construction of steric mass-charge channels, which highly facilitates the activity of oxygen reduction reactions in both the rotating disk electrode (RDE) measurements and MEA device tests. Specifically, the normalized mass activity is remarkably boosted by 3.7 times to 1.56 A mgpt-1 after additions of suitable COF modifications in the RDE tests. Especially, an excellent maximum power density of 1.015 W cm-2 is realized on the MEA in H2/Air condition, representing a 22% improvement through such constructions of steric mass-charge channels. Meanwhile, the open-circuit voltage of fuel cells demonstrates only 0.8% reductions after 10,000 cycles of stability tests. We further extended such methodology of constructing mass-charge channels to granular PtCo and commercial Pt/C catalysts, which demonstrates a significant impetus for stimulating the catalytic activity in fuel cells.

DOI: 10.1002/anie.202424179

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202424179