Free-standing graphene/bismuth vanadate monolith composite as a binder-free electrode for symmetrical supercapacitors

被引:51
作者
Deng, Lingjuan [1 ]
Liu, Jiahuan [1 ]
Ma, Zhanying [1 ]
Fan, Guang [1 ]
Liu, Zong-huai [2 ,3 ]
机构
[1] Xianyang Normal Univ, Coll Chem & Chem Engn, Xianyang 712000, Shaanxi, Peoples R China
[2] Shaanxi Normal Univ, Minist Educ, Key Lab Appl Surface & Colloid Chem, Xian 710062, Shaanxi, Peoples R China
[3] Shaanxi Normal Univ, Sch Mat Sci & Engn, Xian 710062, Shaanxi, Peoples R China
关键词
HIGH-PERFORMANCE SUPERCAPACITOR; ELECTROCHEMICAL ENERGY-STORAGE; BISMUTH OXIDE; NICKEL FOAM; NI-FOAM; HYBRID; CARBON; BIVO4; NANOSTRUCTURES; MICROSPHERES;
D O I
10.1039/c8ra04200d
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Preparation of new types of electrode material is of great importance to supercapacitors. Herein, a graphene/bismuth vanadate (GR/BiVO4) free-standing monolith composite has been prepared via a hydrothermal process. Flexible GR sheets act as a skeleton in the GR/BiVO4 monolith composites. When used as a binder-free electrode in a three-electrode system, the GR/BiVO4 composite electrode can provide an impressive specific capacitance of 479 F g(-1) in a potential window of -1.1 to 0.7 V vs. SCE at a current density of 5 A g(-1). A symmetrical supercapacitor cell which can be reversibly charged-discharged at a cell voltage of 1.6 V has been assembled based on this GR/BiVO4 monolith composite. The symmetrical capacitor can deliver an energy density of 45.69 W h kg(-1) at a power density of 800 W kg(-1). Moreover, it ensures rapid energy delivery of 10.75 W h kg(-1) with a power density of 40 kW kg(-1).
引用
收藏
页码:24796 / 24804
页数:9
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