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

Journal Article · · Nature Energy

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. Here, 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.

Research Organization:
Univ. of Delaware, Newark, DE (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0000771
OSTI ID:
1545542
Journal Information:
Nature Energy, Vol. 4, Issue 5; ISSN 2058-7546
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 330 works
Citation information provided by
Web of Science

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Molecular Design of Single‐Atom Catalysts for Oxygen Reduction Reaction journal February 2020
Enhanced Electrocatalytic Hydrogen Oxidation on Ni/NiO/C Derived from a Nickel‐Based Metal–Organic Framework journal June 2019
Understanding the pH Dependence of Underpotential Deposited Hydrogen on Platinum journal October 2019
Enhanced Electrocatalytic Hydrogen Oxidation on Ni/NiO/C Derived from a Nickel-Based Metal-Organic Framework journal June 2019
Understanding the pH Dependence of Underpotential Deposited Hydrogen on Platinum journal December 2019
Partially fluorinated copolymers containing pendant piperidinium head groups as anion exchange membranes for alkaline fuel cells journal January 2019
Effects of the N -alicyclic cation and backbone structures on the performance of poly(terphenyl)-based hydroxide exchange membranes journal January 2019
Ether-free polyfluorenes tethered with quinuclidinium cations as hydroxide exchange membranes journal January 2019
High-Performance Hydroxide Exchange Membrane Fuel Cells through Optimization of Relative Humidity, Backpressure and Catalyst Selection journal January 2019