Poly(aryl piperidinium) membranes and ionomers for hydroxide exchange membrane fuel cells

Junhua Wang, Yun Zhao, Brian P. Setzler, Santiago Rojas-Carbonell, Chaya Ben Yehuda, Alina Amel, Miles Page, Lan Wang, Keda Hu, Lin Shi, Shimshon Gottesfeld, Bingjun Xu () and Yushan Yan ()
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Junhua Wang: Department of Chemical and Biomolecular Engineering, University of Delaware
Yun Zhao: Department of Chemical and Biomolecular Engineering, University of Delaware
Brian P. Setzler: Department of Chemical and Biomolecular Engineering, University of Delaware
Santiago Rojas-Carbonell: Department of Chemical and Biomolecular Engineering, University of Delaware
Chaya Ben Yehuda: Elbit Systems Ltd, Caesarea Business and Industrial Park
Alina Amel: Elbit Systems Ltd, Caesarea Business and Industrial Park
Miles Page: Elbit Systems Ltd, Caesarea Business and Industrial Park
Lan Wang: Department of Chemical and Biomolecular Engineering, University of Delaware
Keda Hu: Department of Chemical and Biomolecular Engineering, University of Delaware
Lin Shi: Department of Chemical and Biomolecular Engineering, University of Delaware
Shimshon Gottesfeld: Department of Chemical and Biomolecular Engineering, University of Delaware
Bingjun Xu: Department of Chemical and Biomolecular Engineering, University of Delaware
Yushan Yan: Department of Chemical and Biomolecular Engineering, University of Delaware

Nature Energy, 2019, vol. 4, issue 5, 392-398

Abstract: Abstract One promising approach to reduce the cost of fuel cell systems is to develop hydroxide exchange membrane fuel cells (HEMFCs), which open up the possibility of platinum-group-metal-free catalysts and low-cost bipolar plates. However, scalable alkaline polyelectrolytes (hydroxide exchange membranes and hydroxide exchange ionomers), a key component of HEMFCs, with desired properties are currently unavailable, which presents a major barrier to the development of HEMFCs. Here we show hydroxide exchange membranes and hydroxide exchange ionomers based on poly(aryl piperidinium) (PAP) that simultaneously possess adequate ionic conductivity, chemical stability, mechanical robustness, gas separation and selective solubility. These properties originate from the combination of the piperidinium cation and the rigid ether-bond-free aryl backbone. A low-Pt membrane electrode assembly with a Ag-based cathode using PAP materials showed an excellent peak power density of 920 mW cm−2 and operated stably at a constant current density of 500 mA cm−2 for 300 h with H2/CO2-free air at 95 °C.

Date: 2019
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DOI: 10.1038/s41560-019-0372-8

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