双功能
尖晶石
电化学
催化作用
兴奋剂
拉曼光谱
材料科学
析氧
石墨烯
氧气
化学工程
纳米技术
无机化学
冶金
化学
电极
光电子学
工程类
有机化学
物理化学
光学
物理
生物化学
作者
Yinggang Sun,Tingwei Zhang,Peng Sun,Jigang Wang,Wenjie Duan,Yanqiong Zhuang,Likai Wang,Zhongfang Li
标识
DOI:10.1016/j.jechem.2024.03.019
摘要
The preparation of bifunctional catalysts for oxygen reduction (ORR) and oxygen evolution (OER) is crucial for Zn-air batteries. Here, we report a La doped CoFe2O4 spinel catalyst supported on three-dimensional graphene (3D-G), where La can facilitate electron transfer from Co to Fe, leading to increased electron cloud density in Fe and improved catalytic performance. The redshift of the G peak in the Raman spectra indicates the interaction between the π bond of 3D-G and d orbitals in La0.2CoFe1.8O4. La0.2CoFe1.8/3D-G exhibits superior ORR performance (E1/2= 0.86 V vs. RHE) and OER performance (Ej=10= 1.55 V vs. RHE) to CoFe2O4/3D-G (E1/2= 0.831 V vs. RHE, Ej=10= 1.603 V vs. RHE). Furthermore, it demonstrates excellent bifunctional oxygen catalytic performance while maintaining high power density and stability in liquid zinc-air batteries (ZABs) and flexible ZABs (F-ZABs). This work presents a viable strategy for utilizing rare earth element doped spinels to enhance oxygen catalyst and ZABs performance.
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