Low Pt loading for high-performance fuel cell electrodes enabled by hydrogen-bonding microporous polymer binders

Hongying Tang (), Kang Geng, David Aili, Qing Ju, Ji Pan, Ge Chao, Xi Yin, Xiang Guo, Qingfeng Li () and Nanwen Li ()
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Hongying Tang: Chinese Academy of Sciences
Kang Geng: Chinese Academy of Sciences
David Aili: Technical University of Denmark, Elektrovej
Qing Ju: Chinese Academy of Sciences
Ji Pan: Soochow University
Ge Chao: Chinese Academy of Sciences
Xi Yin: Chinese Academy of Sciences
Xiang Guo: Chinese Academy of Sciences
Qingfeng Li: Technical University of Denmark, Elektrovej
Nanwen Li: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract A key challenge for fuel cells based on phosphoric acid doped polybenzimidazole membranes is the high Pt loading, which is required due to the low electrode performance owing to the poor mass transport and severe Pt poisoning via acid absorption on the Pt surface. Herein, these issues are well addressed by design and synthesis of effective catalyst binders based on polymers of intrinsic microporosity (PIMs) with strong hydrogen-bonding functionalities which improve phosphoric acid binding energy, and thus preferably uphold phosphoric acid in the vicinity of Pt catalyst particles to mitigate the adsorption of phosphoric acid on the Pt surface. With combination of the highly mass transport microporosity, strong hydrogen-bonds and high phosphoric acid binding energy, the tetrazole functionalized PIM binder enables an H2-O2 cell to reach a high Pt-mass specific peak power density of 3.8 W mgPt−1 at 160 °C with a low Pt loading of only 0.15 mgPt cm−2.

Date: 2022
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DOI: 10.1038/s41467-022-34489-x

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