The BET specific surface areas of the four types of samples were compared and revealed a clear trend toward higher specific surface areas, following the order CoP@bio-C (291.82 m 2 g −1 ) < CoNP@bio-C (365.40 m 2 g −1 ) < bio-C (455.74 m 2 g −1 ) < CoNP@bio-C-a (475.55 m 2 g −1 ).
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Co<sub>2</sub>O<sub>3</sub>/Co<sub>2</sub>N<sub>0.67</sub> nanoparticles encased in honeycomb-like N, P, O-codoped carbon framework derived from corncob as efficient ORR electrocatalysts.
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