High efficient carbon coated TiO₂electrode for ultra-capacitor applications

Abstract

The present paper reports the investigation of structural, optical, chemical bonding, and electrical properties of the carbon black (CB)/TiO 2 composite synthesized via the standard sol-gel method. The structural and morphological properties have been investigated using x-ray diffraction and also field emission scanning electron microscopy to confirm the formation of the nanocomposite. The electrochemical performance of the two-electrode symmetric fabricated supercapacitor (SC) has been examined by complex impedance spectroscopy, cyclic voltammetry, and galvanostatic charge-discharge (GCD). The electrode CT15 (15% TiO 2 in CB matrix) shows a high specific capacitance of 236 F g −1 at scan rate 10 mV s −1 . The GCD illustrates good specific capacitance retention of 90.3% after 10 000 cycles and with energy density and power density values as 22 Wh kg −1 and 625 kW kg −1 respectively (at 1 A g −1 ) in the voltage window of 1.2 V. The CT15 electrode cell demonstrates superior electrochemical performance as compared to other electrodes. Electrochemical impedance spectroscopy (EIS) demonstrates the capacitive behaviour of the composite electrode with a low value of resistance. The SC cell having optimum performance has been chosen to demonstrate the glowing red light emitting diode. A mechanism has also been proposed based on received data parameters to validate the SC performance.

High performance of the sodium‐ion conducting flexible polymer blend composite electrolytes for electrochemical double‐layer supercapacitor applications

“…The calculated value of ESR estimated in our work is much less than other published reports 81 . Our important electrochemical parameters such as energy and power density of the fabricated cell determined using the equation: and Here, E d , P d , C , and V represent the energy density, power density, specific capacitance, and potential window, respectively 82‐84 . The calculated energy and power density at a current density of 10 mA cm −2 as 27.7 Wh kg −1 at 9972 W kg −1 is represented in Figure 9D and Figure 10A.…”

“…Here, E d , P d , C, and V represent the energy density, power density, specific capacitance, and potential window, respectively. [82][83][84] The calculated energy and power density at a current density of 10 mA cm À2 as 27.7 Wh kg À1 at 9972 W kg À1 is represented in Figure 9D and Figure 10A. The energy along power density is almost constant for 100 cycles.…”

Construction of three‐dimensional marigold flower‐shaped Ni3V2O8 for efficient solid‐state supercapacitor applications

“…40,41 The R ct values of all three cells are 1.08, 1.38, and 0.36 Ω for Cell-1, Cell-2, and Cell-3, respectively. 42 The lowest charge-transfer resistance for the Cell-3 infers the fast faradic processes. A theoretical fitting has been employed to see the accuracy of the experimentally obtained parameters.…”

“…The charge transfer resistance ( R ct ) is obtained corresponding to the semi‐circle at high frequency and explores the OH − migration 40,41 . The R ct values of all three cells are 1.08, 1.38, and 0.36 Ω for Cell‐1, Cell‐2, and Cell‐3, respectively 42 . The lowest charge‐transfer resistance for the Cell‐3 infers the fast faradic processes.…”

Theoretical screening of single atom doping on β-Ga2O3 (100) for photoelectrochemical water splitting with high activity and low limiting potential

“…Various semiconducting oxides have been studied as photoelectrodes for PEC, such as TiO 2 , Fe 2 O 3 , RuO 2 , and ZnO. [5][6][7] Ga 2 O 3 is electrically conducting and it has attracted much attention in many areas, such as transparent conductors and ultraviolet (UV) photodetectors. [8][9][10] Moreover, among the five distinct crystalline structures of Ga 2 O 3 (α, β, γ, δ, and ε), monoclinic gallium oxide (β-Ga 2 O 3 ) is the most stable crystal phase, and β-Ga 2 O 3 is a chemically, thermally, and catalytically stable native oxide, 11 and has higher photocatalytic activity than the other phases.…”