摘要
Developing high-performance,durable,and cost-effective oxygen reduction reaction(ORR)catalysts is essential for advancing next-generation energy devices like zinc-air batteries(ZABs).Herein,we engineer a hybrid Fe-N-C catalyst(FeSA-Fe_(NP)/CeO_(2)@NC)integrating atomically dispersed Fe-Nx sites,Fe nanoparticles,and oxygen vacancy-rich CeO_(2) nanoparticles within a nitrogen-doped carbon matrix.Interfacial charge transfer and oxygen vacancy-mediated electron redistribution,synergistically enhanced by strong metal-support interactions(SMSI),optimize the electronic configuration of Fe-Nx sites and reduce their electron density.The resulting catalyst exhibits exceptional ORR activity and stability,featuring a half-wave potential of 0.925 V(vs.RHE)in alkaline media and minimal degradation(1%and 2.8%negative shifts after 10,000/20,000 cycles).In ZABs,it achieves a peak power density of 310.29 mW·cm-2 while sustaining stable operation for over 600 h.This work demonstrates dual role of CeO_(2) in enhancing activity and stability,establishing a design principle for high-performance electrocatalysts in energy conversion systems.
基金
support from the National Key R&D Program of China:Strategic International Innovation Cooperation(2024YFE020940O)
the National Natural Science Foundation of China(52373187,52573228)
the National Youth Top-notch Talent Support Program of China,the Natural Science Foundation of Jiangxi Province(20224ACB204006)
the"Double Thousand Plan"Science and Technology Innovation High-End Talent Project of Jiangxi Province(jxsq2023201094).
