MOF-derived Fe-N-Celectrocatalyst for efficient oxygen reduction reactions
Due to the large consumption of traditional energy and environmental pollution,it is more and more impor-tant to explore efficient and clean new energy sources.Zinc-empty battery has been widely concerned as a kind of green and clean energy,but its slow cathodic oxygen reduction(ORR)reaction limits its large-scale application.Therefore,it is very important to develop an efficient and green economic non-precious metal catalyst for oxygen reduction reaction.In this paper,metal-organic framework(MOF)is used as the precursor,Fe-N doped carbon electrocatalyst(Fe-N-C)was synthesized by high temperature pyrolysis.Fe-N-C catalyst can avoid the aggregation and dissolution of metal atoms due to its strong metal-nitrogen coordination structure,so that the metal atoms are uniformly dispersed on the nitrogen-doped carbon carrier,and achieve high ORR performance.The prepared Fe-N-C-2 catalyst has abundant pore structure and a large number of Fe-Nx active sites.The half-wave potential is 0.91 V in alkaline electrolyte and 0.75 V in acidic e-lectrolyte.At the same time,it is applied to zinc-air batteries with an open circuit voltage of up to 1.47 V and a power density of 163.1 mW/cm2.This strategy provides a promising approach for designing two-dimensional structures to con-struct high-performance electrocatalysts.
non-precious metal catalystmetal-organic frameworkFe-N-Coxygen reduction reactionzinc-air battery
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