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Updated: Oct 11, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
Reconciling temperature-dependent factors affecting mass transport losses in polymer electrolyte membrane
ChungHyuk Lee1, Jason K Lee1, Michael G George1
1Thermofluids for Energy and Advanced Materials (TEAM) Laboratory Department of Mechanical and Industrial Engineering, University of Toronto Institute for Sustainable Energy Faculty of Applied Science and Engineering, University of Toronto, Toronto Ontario, Canada M5S 3G8.
Abstract:
In this work, we investigated the impact of temperature on two-phase transport in low temperature (LT)-polymer electrolyte membrane (PEM) electrolyzer anode flow channels via in operando neutron imaging and observed a decrease in mass transport overpotential with increasing temperature. We observed an increase in anode oxygen gas content with increasing temperature, which was counter-intu.itive to the trends in mass transport overpotential. We attributed this counterintuitive decrease in mass transport overpotential to the enhanced reactant distribution in the flow channels as a result of the temperature increase, determined via a one-dimensional analytical model. We further determined that gas accumulation and fluid property changes are competing, temperature-dependent contributors to mass transport overpotential; however, liquid water viscosity changes led to the dominate enhancement of reactant water distributions in the anode. We present this temperature-dependent mass transport overpotential as a great opportunity for further increasing the voltage efficiency of PEM electrolyzers.
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