Abstract
Development of polymer electrolyte membranes (PEMs) that can be operated over 200 °C is an ideal solution for the transition to a hydrogen society. Currently used PEM fuel cells are limited by their low operating temperature, which restricts their use in a variety of applications. Here we developed a new PEM made of cerium hydrogen phosphate (CeHP) and para-polybenzimidazole (p-PBI) comprising a self-assembled network (SAN). Self-assembled, echinoid-shaped CeHP were overlapped together and well-dispersed in the PEM, outperforming proton transport above 200 °C compared to p-PBI and the conventional CeHP-PBI. SAN-CeHP-PBI reached a maximum peak power density of 2.35 W cm-2 (250 °C, dry H2/O2) with negligible degradation for 500 h (thermal cycles of 160 ~ 240 °C, H2/Air) and 4,575 h (80 ~ 160 °C, H2/Air), respectively. SAN-CeHP-PBI also demonstrates excellent CO tolerance, emphasizing its potential for integration into a combined fuel processor-fuel cell system with high energy efficiency.
Published Version
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