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The large‐scale commercialization of proton‐exchange‐membrane fuel cells (PEMFCs) is extremely limited by their costly platinum‐group metals (PGMs) catalysts, which are used for catalyzing the sluggish oxygen reduction reaction (ORR) kinetics at the cathode. Among the reported PGM‐free catalysts so far, metal–nitrogen–carbon (M–Nx/C) catalysts hold a great potential to replace PGMs catalysts for the...
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