Enhancement of oxygen reduction activity with addition of carbon support for non-precious metal nitrogen doped carbon catalyst

► Non-precious metal N-doped carbon catalysts with the addition of Ketjen black carbon support. ► Catalysts for oxygen reduction reaction. ► Phenol resin and cobalt phenanthroline complex as catalyst precursors. ► Increasing additive amount of Ketjen black carbon support improves catalytic activities and dispersion state of catalysts.