Abstract
Understanding the degradation mechanism of Fe/N/C cathode catalysts in proton exchange membrane fuel cells (PEMFCs) is extremely important. In this study, an Fe/N/C catalyst prepared from polyimide nano-particles was placed in an in-situ cell for X-ray absorption spectroscopy, and its Fe K-edge adsorption spectra were acquired during a continuous operation of the fuel cell. The valence of the Fe specie at the initial stage was 3+. The spectra gradually changed during the fuel cell operation, suggesting that the dissolution of the Fe species from the active sites.
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