Effect of MoS2 and electrolyte temperature on the electrochemical performance of NiCoS@rGO-based electrode material for energy storage, oxygen reduction reaction and electrochemical glucose sensor
Mabkhoot Alsaiari, Muhammad Imran, Amir Muhammad Afzal, Muhammad Waqas Iqbal, Jari S. Algethami, Farid A. Harraz
Abstract
Two-dimensional transition metal dichalcogenides (2D-TMDs) are essential in energy storage devices. MoS 2 /rGO nanostructures have improved energy storage capacity because of their layered shape, proximity effect, inherent broad surface area, and edge locations. Herein, we have synthesized NiCoS@MoS 2 @rGO composite electrode material for supercapattery energy storage devices and electrochemical glucose sensors via the hydrothermal method . The electrochemical performance of NiCoS, NiCoS@MoS 2 and NiCoS@MoS 2 @rGO were first investigated in three electrode assemblies at different electrolyte temperatures (27 °C to 50 ° C). Among all the samples, NiCoS@MoS 2 @rGO shows the superior value of Qs (1138C/g or 1896.66 F/g) with 1 M KOH electrolyte solution at 50 ° C. The asymmetric NiCoS@MoS 2 @rGO//AC device showed a high specific capacity (301C/g, at 1 A/g), energy and power densities of 65.44 (Wh/Kg), and 1267.18 (W/Kg), respectively. A significant value of Coulombic efficiency of 92.79 % and capacity retention of 83.42 % was acquired after 5000 galvanostatic charging/discharging (GCD) cycles. Further, the NiCoS@MoS 2 @rGO nanocomposite electrode material is used for oxygen reduction reaction activity. The initial potential for the oxygen reduction was 0.67 V vs. RHE, and the electrode showed high stability. Besides, the hybrid device is used as an electrochemical glucose sensor to detect glucose with a highly precise detection response. This research will open new ideas for developing more efficient TMDs sulfide-based nanocomposite materials for future energy storage systems and biomedical applications.