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

Abstract

Preparation of new types of electrode material is of great importance to supercapacitors. Herein, a graphene/bismuth vanadate (GR/BiVO 4 ) free-standing monolith composite has been prepared via a hydrothermal process. Flexible GR sheets act as a skeleton in the GR/BiVO 4 monolith composites.When used as a binder-free electrode in a three-electrode system, the GR/BiVO 4 composite electrode can provide an impressive specific capacitance of 479 F g À1 in a potential window of À1.1 to 0.7 V vs. SCE at a current density of 5 A g À1. A symmetrical supercapacitor cell which can be reversibly chargeddischarged at a cell voltage of 1.6 V has been assembled based on this GR/BiVO 4 monolith composite.The symmetrical capacitor can deliver an energy density of 45.69 W h kg À1 at a power density of 800 W kg À1. Moreover, it ensures rapid energy delivery of 10.75 W h kg À1 with a power density of 40 kW kg À1 .

Facile Chemical Synthesis and Potential Supercapattery Energy Storage Application of Hydrangea-type Bi2MoO6

“…The Ragone plot of the symmetric supercapattery device at different current densities is given in Figure 5d, where the above results were based on the mass of the two active electrodes. It can be understood that the Bi 2 MoO 6 //Bi 2 MoO 6 symmetrical supercapattery device exhibited a remarkable energy density/power density (45.6 W h kg –1 /989 W kg –1 ), which is greater than those of symmetrical cells reported previously for CS@Bi 2 MoO 6 //CS@Bi 2 MoO 6 (10.8 W h kg –1 /410 W kg –1 ), 40 RuO 2 /graphene//RuO 2 /graphene (11 W h kg –1 /76 W kg –1 ), 64 Ni@FeCo 2 O 4 @MnO 2 //Ni@FeCo 2 O 4 @MnO 2 (22.2 W h kg –1 /978.3 kW kg –1 ), 65 and GR/BiVO 4 //GR/BiVO 4 (45.69 W h kg –1 /800 kW kg –1 ) 66 devices. The energy density/power density value (45.6 W h kg –1 /989 W kg –1 ) obtained in the present work was appealing.…”

High-performance aqueous rechargeable nickel//bismuth batteries with Bi2MoO6@rGO and Co0.5Ni0.5MoO4@rGO as electrode materials

“…The Ni//Bi battery exhibited a maximum energy and power density of 53.1 W h kg −1 and 3471.2 W kg −1 , which were comparable to other energy storage devices reported in the literature, such as 34.29 W h kg −1 and 329 W kg −1 of NiO//Bi 2 O 3 @C Ni//Bi batteries 8 , 21.8 W h kg −1 and 660 W kg −1 of Ni(OH) 2 @3D Ni//AC SCs, 73 and 36.2 W h kg −1 and 160 W kg −1 of CoNiO 2 //AC SCs, 74 and other energy storage devices. 75–82 As shown in Fig. S7b (ESI†), two Ni//Bi batteries models connected in series could light up a red LED bulb.…”

Experimental and computational investigation on the charge storage performance of a novel Al2O3 -grpahene hybrid electrode

“…2(e, f). The BET isotherms exhibit the typical type (IV) adsorptiondesorption isotherms, which is characteristic of mesoporous materials 27,28 . The BET surface areas of The micro-scale surface investigation of the samples was done with the help of FE-SEM, which is depicted in Fig.…”