A variation in fluctuation dynamics of the noise component of the electric potential of a fuel cell was studied. A fuel cell with polymer membrane and gas diffusion layer was tested and treated with a fast degradation procedure. The characteristics of electrochemical noise were obtained using a flicker noise spectroscopy that provides an analysis of a cosine-spectrum of autocorrelation function and second order difference moment of voltage noise. A sequence of fast degradation steps results in a change of maximum load current of a polymer electrolyte membrane fuel cell. The main effect of fast degradation on the noise parameters is the change in the ratio of areas (i.e. power) of the low- frequency peak (a range of ΔfLF = 0.001 – 0.003 Hz) to the high-frequency peak (a range of ΔfHF = 0.258 – 0.262 Hz) in cosine-spectrum of the autocorrelation function.
展开▼
