钴酸盐
尖晶石
材料科学
超级电容器
电化学
化学工程
电极
比表面积
无机化学
磷酸铁
磷酸盐
化学
催化作用
冶金
物理化学
有机化学
工程类
作者
Yang Zhao,Yun Zeng,Wei Tang,Cheng‐Lu Jiang,Hengyuan Hu,Xiaoqiang Wu,Jun‐Heng Fu,Zhenhua Yan,Minglei Yan,Yong Wang,Liang Qiao
标识
DOI:10.1016/j.jcis.2022.10.159
摘要
Spinel iron cobaltite (FeCo2O4) with high theoretical capacity is a promising positive electrode material for building high-performance supercapacitors. However, its inherent poor conductivity and deficient electrochemical active sites hinder the improvement of its electrochemical kinetics behavior. Herein, phosphate ions modified FeCo2O4 is obtained in the presence of oxygen vacancies (P-FeCo2O4-x) by a simple metal organic framework gel-derived strategy. Phosphate ions added on the surface of P-FeCo2O4-x greatly enhances its surface activity, thus prompting the faster charge storage kinetics of the electrode material. Due to its ample electrochemical active sites and rapid ion diffusion and electron mobility, the optimized P-FeCo2O4-x electrode delivers a superior specific capacity of 1568.8 F g-1 (784.4 C g-1) at a current density of 1 A/g and has an excellent cycling stability with 93.3 % initial capacity retention ratio after 5000 cycles. More impressively, the assembled asymmetric supercapacitor consisting of P-FeCo2O4-x and activated carbon which act as positive and negative electrode materials, respectively displays a favorable energy density of 60.2 Wh kg-1 at a power density of 800 W kg-1 and has a long cycling lifespan. These results demonstrate the potential importance of modifying the surface of spinel cobaltite with phosphate ions and incorporating oxygen defects in it as a facile strategy for enhancing the electrochemical kinetics of electrode materials.
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