Substantially integrated fuel cell with new self-assembled proton-conductor
발표자
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초록
내용
Modern H2-based energy storage and conversion devices require a polymer electrolyte membrane (PEM) fuel cell–based power system with synergistic heat integration. The key issue in the integrated power systems is developing a PEM that can operate at 200–300 °C. However, currently used phosphoric-acid-based PEM fuel cells limited stability at higher operating temperatures. Herein, we introduce a cerium hydrogen phosphate (CeHP) PEM comprising a self-assembled network (SAN) with polybenzimidazole (PBI) that allows a well-consolidated proton transport pathway above 200 °C. SAN-CeHP-PBI reached maximum power densities of 2.4 W cm-2 and operated stably for over 7000 minutes without any voltage decay at 250 °C under H2/O2 and anhydrous conditions. The developed fuel cell can be combined with an external hydrogen generator that uses a liquid hydrogen carrier such as N-ethylcarbazole and methanol as fuel, thereby achieving a high energy efficiency.