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Uniform cobalt and nitrogen co-doped carbon nanospheres (CoN–CNS) with high specific surface area (865 m2 g−1) have been prepared by a simple but efficient method. The prepared CoN–CNS catalyst exhibits outstanding catalytic performance for the oxygen reduction reaction (ORR) in both alkaline and acidic electrolytes. In alkaline electrolyte, the prepared CoN–CNS has more positive half-wave potential...
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