Fe-N-C materials,boasting exceptional catalytic activity,stand out as ideal candidates for replacing platinum-group metals in catalyzing the oxygen reduction reaction(ORR).However,their stability is challenged by the ...Fe-N-C materials,boasting exceptional catalytic activity,stand out as ideal candidates for replacing platinum-group metals in catalyzing the oxygen reduction reaction(ORR).However,their stability is challenged by the attack of oxidative radicals generated from the incomplete reduction of H_(2)O_(2).Inspired by the antioxidant mechanisms of natural organisms,Se dopants were introduced with antioxidant properties into the Fe-N-C materials to serve as effective H_(2)O_(2) scavengers.Experimental results reveal that the Se-doped samples are capable of swiftly catalyzing the H_(2)O disproportion decomposition,markedly diminishing the H_(2)O yield and consequently decreasing the generation of reactive oxygen species(ROs).Furthermore,the incorporation of Se significantly enhances the corrosion resistance of the carbon substrate.Capitalizing on the synergistic impact detailed above,the series of Se-modified Fe-N-C catalysts all exhibit significantly superior stability compared to their undoped counterparts in acidic media.Our work provides a proactive defense strategy for enhancing the durability of the Fe-N-C catalysts and forges a novel route for the development of highly stable non-noble metal ORR catalysts.展开更多
基金supported by the National Natural Science Foundation of China(22209102)the Fundamental Research Program of Shanxi Province(202203021212398).
文摘Fe-N-C materials,boasting exceptional catalytic activity,stand out as ideal candidates for replacing platinum-group metals in catalyzing the oxygen reduction reaction(ORR).However,their stability is challenged by the attack of oxidative radicals generated from the incomplete reduction of H_(2)O_(2).Inspired by the antioxidant mechanisms of natural organisms,Se dopants were introduced with antioxidant properties into the Fe-N-C materials to serve as effective H_(2)O_(2) scavengers.Experimental results reveal that the Se-doped samples are capable of swiftly catalyzing the H_(2)O disproportion decomposition,markedly diminishing the H_(2)O yield and consequently decreasing the generation of reactive oxygen species(ROs).Furthermore,the incorporation of Se significantly enhances the corrosion resistance of the carbon substrate.Capitalizing on the synergistic impact detailed above,the series of Se-modified Fe-N-C catalysts all exhibit significantly superior stability compared to their undoped counterparts in acidic media.Our work provides a proactive defense strategy for enhancing the durability of the Fe-N-C catalysts and forges a novel route for the development of highly stable non-noble metal ORR catalysts.
