Fig. 5: Outpacing Pt oxidation in fuel cell catalyst layer during accelerated stress tests.
From: Metal-oxide phase transition of platinum nanocatalyst below fuel cell open-circuit voltage
a Reconstructions of the applied potential cycle profiles between 0.60 and 1.0 V vs. RHE: 3 s – 3 s square wave and triangular waves at 5, 10, 100, 500 and 1000 mV s−1, (b) lattice constant variations with (c) associated Kernel density distribution. d surface-fraction-normalised scattering intensity variations. e Maximum of surface crystallinity loss induced by each potential profile type (cycle depth) and (f) rate of surface crystallinity loss induced by each potential cycle profile (cycle efficiency). The PEM cell was operated at 80 °C with H2/N2 at anode/cathode, 104/400 sccm flow rates, 52 % relative humidity and 100 mbar backpressure. The cathode potential is corrected from the cell's high-frequency resistance. Errors bars correspond to the standard deviations associated with the refinement or computation of the different parameters. Source data for panels (b, d) are provided as a Source Data file.
