† With the increase in doping of Fe(NO 3 ) 3 ·9H 2 O, the average pore diameter showed a decreasing trend, which was attributed to the potential influence of Fe atoms on the pore structure and morphology of the catalyst. 24 Among them, Fe-BN-C-20 has a high specific surface area of 435.8 m 2 g −1 and an average mesoporous structure of 6.96 nm, which ensures high flux mass transfer. 25,26 In addition, the hydrophilic angle test of the Fe-BN-C-20 catalyst (Fig.
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Preparation of Fe-BN-C catalysts derived from ZIF-8 and their performance in the oxygen reduction reaction.
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