Abstract
Although as the most active platinum group metal (PGM) free catalysts, M‐N‐C catalysts have shown satisfactory activity to replace PGM catalysts in the cathode of proton exchange membrane fuel cells (PEMFCs), the stability issue is still rather challenging, which greatly restricts the practical application of M‐N‐C catalysts. To address the stability problem, firstly the related degradation mechanisms of M‐N‐C catalysts should be elucidated. Peng et al. summarized the five widely accepted degradation mechanisms of M‐N‐C catalysts, namely demetallation, carbon corrosion, attack of H2O2, N protonation, and water flooding. More details are discussed in the article by Zhao et al. on page 710—724.image
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