Binder-free reduced graphene oxide as electrode material for efficient supercapacitor with aqueous and polymer electrolytes

Abstract

The demand for energy and energy storage devices is the urgent need of our society due to heavy dependence on electric appliances. Hence, the demand of graphene-like smart materials has grown tremendously in the past years. Herein, we investigated the binder-free graphene allies named reduced graphene oxide (rGO) as electrode materials for the supercapacitor after the reduction of graphene oxide by sinking and leaving process. The rGO-based devices show the areal specific capacitance of 80.2 and 7.89 mF cm−2 with aqueous 1M phosphoric acid (H3PO4) and poly (vinyl alcohol)-H3PO4 polymer gel electrolytes, respectively, over the graphite sheet.

A waste to energy approach for the effective conversion of solid waste plastics into graphene nanosheets using different catalysts for high performance supercapacitors: a comparative study

“…This electrochemical workstation was used to perform the cyclic voltammetry (CV), galvanostatic charge/ discharge (GCD), and electrochemical impedance spectroscopy (EIS) tests, which are the most common and important tests for evaluating the performance of SCs. 27,35,36 CV is an important technique for evaluating the capacitance and cyclic behavior of SC cells over the operating voltage range. The cells showed curves with rectangular and nearly rectangular shapes over the operating voltage range of À1 V to 1 V at different scan rates.…”

“…In the present case, we have used aqueous electrolyte, which generally shows higher conductivity and faster ion transport compared to PGE; therefore, the electrolyte ions are accessible to the electrode surface, which is directly responsible for the higher specific capacitance. 35,52 Furthermore, the energy and power density were also calculated for the fabricated cells using eqn (4) and ( 5), respectively, and are shown in Table 5. It is clearly seen from this table that the use of different catalysts and templates in the synthesis of the GNs derived from waste plastic plays a significant role in enhancing their energy storage application, with energy densities of B1.6 W h kg À1 using ZGNs and B21 W h kg À1 using MGNs as the active electrode material; both materials provided almost the same power density of B1010 W kg À1 .…”

“…In present case, we have used the aqueous electrolyte which is generally showed the higher conductivity and faster ion transport as compared to PGE, therefore, electrolyte ions are accessible to the electrode surface which is directly responsible for the higher specific capacitance. 35,52 Further, the cyclic stability is another important factor for practical application of SC. To find out the stability of both cells, we performed sequential GCD measurement for 5000 cycles at a current density of 1 A/g for Cell-1 and Cell-2 (Figure 12 (c)).…”

Highly conducting polymer electrolyte-ionic liquid and porous carbon material for sandwich electric double layer capacitor

“…Apart from conductivity property of an ionic liquid some other properties also gain attention of researchers like chemical stability, high polarity, solubility (affinity), moderate viscosity, and negligible volatility. [1][2][3][4] Activated carbon (AC) is also called activated charcoal or activated coal, is a form of exotic carbonaceous material, having potential properties like large specific surface area due to highly porous in its structure and morphology, good semiconductor, non-hazardous, and environmentally safe. High surface area and zigzag morphology with defected short-range graphitic structure make it porous.…”

Polymer grafted magnetic graphene oxide as a potential nanocarrier for pH-responsive delivery of sparingly soluble quercetin against breast cancer cells

“…1(a) shows the 2D band at 2861.9 cm À1 which represents purity, formation of graphene structure and number of layers present in GO. 37 The intensity ratio of 2D and G band i.e., I 2D /I G shows the number of sheets in GO. According to the Raman spectra of GO, the I 2D /I G ratio is 0.48, representing the existence of more than two layers of GO.…”