Importance of Time‐Dependent Wetting Behavior of Gas‐Diffusion Electrodes for Reactivity Determination

Tin foil and SnOx/C gas-diffusions electrodes (GDEs) were investigated via electrochemical impedance spectroscopy (EIS) to extract the differential double-layer capacitance (Cdl) as a measure of wetted surface area. Time-dependent Cdl values revealed an immediate stationary wetting for tin while distinct increase – which becomes with time was observed GDEs. The time-dependent behavior GDEs substantiated by physical post-mortem characterization. Since area determines number reachable active sites performance should be normalized evaluation reactivity.