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The performance of polymer‐electrolyte fuel cells is heavily dependent on proper management of liquid water. One particular reason is that liquid water can collect in the gas diffusion layers (GDLs) blocking the reactant flow to the catalyst layer. This results in increased mass‐transport losses. At higher temperatures, evaporation of water becomes a dominant water‐removal mechanism and specifically...
A method for high purity aqueous electrochemical experiments at temperatures above the normal boiling point of water and at temperatures up to 140°C is described. A three-electrode cell in a self-pressurized glass autoclave is heated in an oil bath. Slow ramping of the temperature allows efficient acquisition of kinetic parameters such as activation energies, oxidation onset potentials and Tafel slopes...
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