Low-dimensional high entropy oxide (FeCoCrMnNi)3O4 for supercapacitor applications

被引:30
作者
Yin, Yi [1 ]
Zhang, Wei-Bin [1 ]
Zhang, Xian-Li [1 ]
Theint, Myat Myintzu [1 ,2 ,3 ]
Yang, Jing-Lei [1 ]
Yang, Ze-Qin [1 ]
Li, Jia-Jun [1 ]
Liang, Shan [1 ]
Ma, Xue-Jing [1 ]
机构
[1] Chengdu Univ Technol, Coll Mat & Chem & Chem Engn, Chengdu 610059, Peoples R China
[2] Dept Mines, Mineral Dev Sect Int Relat, Nay Pyi Taw 15011, Myanmar
[3] Minist Nat Resources & Environm, Nay Pyi Taw 15011, Myanmar
关键词
ENERGY-STORAGE; PERFORMANCE; ELECTRODE;
D O I
10.1039/d3dt00909b
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Previous studies have found that high entropy oxides can be used as electrode materials for supercapacitors. However, there is still the problem of their low energy density. We tried to increase the energy density while increasing the specific capacitance of high entropy oxides from the potential window. Transition metal elements Fe, Co, Cr, Mn and Ni were selected for their electrochemical activity, and high entropy oxides were prepared by a sol-gel method under different calcination temperatures. The calcination temperature affects the structural morphology and crystallinity of the high entropy oxides and thus also affects the electrochemical performance. The spinel-phase (FeCoCrMnNi)(3)O-4 with a high specific surface area of 63.1 m(2) g(-1) was prepared at a low calcination temperature of 450 degrees C. The specific capacitance is 332.2 F g(-1) at a current density of 0.3 A g(-1) in 1 M KOH electrolyte with a wide potential window of (-1, 0.6). An improved energy density of 103.8 W h kg(-1) is reached via the designed microstructure of the high entropy oxide electrode.
引用
收藏
页码:9005 / 9016
页数:12
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