Supperlattice-like Strcuture: Ordered Mass Transfer Endows High Quality Output of Fuel Cell

Jian Wang, Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, School of Chemistry and Chemical Engineering, Chongqing University, Shapingba 174, Chongqing (China);
Wenhui Xuan, Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, School of Chemistry and Chemical Engineering, Chongqing University, Shapingba 174, Chongqing (China);
Qian He, Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, School of Chemistry and Chemical Engineering, Chongqing University, Shapingba 174, Chongqing (China);
Jingxia Jiang, Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, School of Chemistry and Chemical Engineering, Chongqing University, Shapingba 174, Chongqing (China);
Yuanyuan Zhou, Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, School of Chemistry and Chemical Engineering, Chongqing University, Shapingba 174, Chongqing (China);
Yao Yao
Nie Nie, Chongqing Key Laboratory of Green Synthesis and Applications, College of Chemistry, Chongqing Normal University, Chongqing 401331, China;
Qiang Liao, Institute of Engineering Thermophysics, School of Energy and Power Engineering Chongqing University, Shapingba 174, Chongqing (China);
Minhua Shao, Department of Chemical and Biomolecular Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong
Wei Ding, Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, School of Chemistry and Chemical Engineering, Chongqing University, Shapingba 174, Chongqing (China);
Zidong Wei, Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, School of Chemistry and Chemical Engineering, Chongqing University, Shapingba 174, Chongqing (China);

Abstract

The current or voltage fluctuation in fuel cell operation is harmful to the fuel cell system and power application equipment. Here, we report a technique to eliminate such a fluctuation by the aid of new type of catalysts, superlattice-like mesoporous PtCo catalysts. The current fluctuation in fuel cells catalyzed by two invented catalysts are fixed at as low as 25 mA·cm-2 with a power of 0.75 W·cm-2 or 120 mA·cm-2 with a power of 1.01 W·cm-2, respectively, and no noticeable current decay were detected over 100 h. By contrast, a cell catalyzed by conventional Pt/C catalysts with the same Pt loading delivers a current fluctuation as large as 180 mA·cm-2 even at low power output of 0.30 W·cm-2, which also showed 32% current decay rate in 50 h. The superlattices-like mesoporous structure not only enhances the mass transfer and depresses the water flooding but also effectively increases the Pt utilization within its 3D carbon frameworks. Its power output is as high as 11.69 W·mgPt-1 (MEA), which is 46.1% higher than the 2025 target of DOE, USA, 8.0 W·mgPt -1(MEA).