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Fe-N-C catalyst with a core-graphitic shell nanostructure was synthesized by pyrolysis of polyacrylonitrile (PAN)-coated carbon black in the presence of iron salts. The attained catalyst exhibits high performance towards the oxygen reduction reaction (ORR) in both acid and alkaline electrolytes, with the half-wave potentials of 97mV negative and 39mV positive to Pt/C in 0.5M H2SO4 and 0.1M NaOH, respectively...
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