With respect to the potential degradation only at C H

The delta V-measurements at thermo-cyclic operation compared to those at isothermal operation at different temperatures (Fig. 6c and d) yield some unexpected results: First, the delta V-temperature profiles (ΔVTPs) for H2 and CO are very reproducible (Fig. 6a and b), but considerably different. They represent different potential generating electrode processes and different temperature behaviors of the contributing reaction steps involved, like gas adsorption/desorption, surface diffusion and oxidation reaction kinetics. The overall oxidation reactions are assumed to proceed according to Eqs.