Simultaneous electrochemical deposition of an e-rGO/β-CD/MnO₂ ternary composite for a self-powered supercapacitor based caffeine sensor

Abstract

A self-powered supercapacitor based on a caffeine sensor electrode has been developed using an electrochemically deposited rGO/β-CD/MnO2 ternary composite with ionic liquid assistance.

Hybrid Reduced Graphene Oxide/Manganese Diselenide Cubes: A New Electrode Material for Supercapacitors

“…To understand the internal resistance and fundamental capacitive behavior of the fabricated cell, electrochemical impedance spectroscopy (EIS) was performed for the MnSe 2 ‐ and G‐MnSe 2 ‐based symmetric cells . The EIS spectra of the MnSe 2 ‐ and G‐MnSe 2 ‐based symmetric cells at the initial stage and after 4500 charge–discharge cycles are shown in Figure b.…”

“…[43c,d] To understand the internal resistance and fundamental capacitive behavior of the fabricated cell, electrochemical impedance spectroscopy (EIS) was performed for the MnSe 2and G-MnSe 2 -based symmetric cells. [44] TheE IS spectra of the MnSe 2 -a nd G-MnSe 2 -based symmetric cells at the initial stage and after 4500 charge-discharge cycles are shown in Figure 6b.A ll Nyquist plots showed as emicircular arc in the high-frequency region and as traight line in the low-frequency region.T he x-axis intercept of the semicircle observed in the high-frequency region represents the electrochemical series resistance (ESR) of the symmetric cell. Thes emicircle observed in the high-medium-frequency region was attributed to the charge-transfer resistance (R ct )a tt he electrodeelectrolytei nterface.T he low-frequency region showed an almost9 0 8 straight line,w hich represents the ideal capacitive behavior of the electrodem aterial.…”

Solar Power and Energy Storage Systems

“…45c,d To understand the internal resistance and fundamental capacitive behavior of the fabricated cell, electrochemical impedance spectroscopy (EIS) was performed on the MnSe 2 -and G-MnSe 2 -based symmetric cells. 46 Compared to MnSe 2 , the G-MnSe 2 hybrid electrode showed lower R ct values, indicating the facile charge transfer and higher electrical conductivity. After 4500 cycles, the R ct value of the G-MnSe 2 hybrid material electrode further decreased from 1.2 to 0.6 , which confirmed the synergistic effects of the rGO and MnSe 2 materials, its good electrical conductivity, and facile charge-transfer kinetics.…”

Reduced Graphene Oxide Carbon Yarn Electrodes for Drug Sensing

“…During CV, a potential range of −1.4 to +1.4 V (vs Ag/AgCl) was scanned for 5, 10, 15 and 20 cycles to deposit rGO onto carbon fibres (Lin et al, 2019). The electrochemical reduction of GO is described by the equation below (Selvam et al, 2016):…”

“…Graphene and its composites have been the focus of much research due to its electrical conductivity, large surface area and high electrocatalytic activity. rGO and its hybrids are widely studied as potential electrode materials for electrochemical sensors and biosensors (Selvam et al, 2016;Yang et al, 2018;Ramezani et al, 2019;Shukla et al, 2020). rGO is produced by the reduction of graphene oxide (GO) from aqueous solutions, making it suitable for a wide variety of biobased applications.…”