摘要
An effective strategy of regulating active sites in bifunctional oxygen electrocatalysts is essentially desired,especially in rechargeable metal-air batteries(RZABs).Herein,a highly efficient electrocatalyst of CoFe alloys embedded in pyridinic nitrogen enriched N-doped carbon(CoFe/P-NC)is intelligently constructed by pyrolysis strategy.The high concentration of pyridinic nitrogen in CoFe/P-NC can significantly reprogram the redistribution of electron density of metal active sites,consequently optimizing the oxygen adsorption behavior.As expected,the pyridinic nitrogen guarantees CoFe/P-NC providing the low overpotential of the overall oxygen electrocatalytic process(ΔEORR-OER=0.73 V vs.RHE)and suppresses the benchmark electrocatalysts(Pt/C&RuO_(2)).Assembled rechargeable Zn-air battery using CoFe/P-NC demonstrates a promising peak power density of 172.0 mW cm^(-2),a high specific capacity of 805.0 mAh g^(-1)Zn and an excellent stability.This work proposes an interesting strategy for the design of robust oxygen electrocatalysts for energy conversion and storage fields.
基金
supported by National Natural Science Foundation of China(52302235,52462013)
Distinguished Young Scholars of Anhui Provincial Department of Education Research Plan(2022AH020068)
Excellent Young Scholars of Anhui Provincial Department of Education Research Plan(2024AH030037)
Excellent Young Teacher Training Program of Anhui(YQZD2024024)
China Postdoctoral Science Foundation(2023M730891)
Natural Science Foundation of Hainan Province(224QN185)
State Key Laboratory of Heavy Oil Processing(SKLHOP202202009).
