Highly nitrogen doped carbon nanosheets as an efficient electrocatalyst for the oxygen reduction reactionElectronic supplementary information (ESI) available: Experimental section, Raman spectrum, and LSV curves of the Pt/C catalyst. See DOI: 10.1039/c5cc02973b

In this work, highly nitrogen doped carbon nanosheets (HNCNSs) have been successfully prepared by annealing EDTA calcium disodium salt. They exhibited a direct four-electron reaction pathway and high stability as an efficient metal-free catalyst for the oxygen reduction reaction. In this work, highly nitrogen doped carbon nanosheets (HNCNSs) have been successfully prepared by annealing EDTA calcium disodium salt. They exhibited a direct four-electron reaction pathway and high stability as an efficient metal-free catalyst for the oxygen reduction reaction.