Electrochemical energy storage and conversion applications of CoSn(OH)6 materials.

Supercapacitors are a boon in today's modern world. The role of a supercapacitor is important in providing electrical energy in the most efficient way for the usefulness of the society. Herein, co-precipitation technique was adapted to prepare electrodes for energy storage and water-splitting purposes. Role of ammonia at different concentrations was deliberated. Better 269 and 364 F/g capacitance was attained for best electrode from cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) curves, respectively. The capacitive and diffusion contribution of all electrodes were estimated and found to be 91.88 and 8.12 for the best sample. A better diffusion contribution of the higher-concentration ammonia sample revealed a higher specific capacitance. In this study, 91.33% capacitive retention and 90.38% columbic efficiency were calculated after 5000 cycles of charge and discharge. Further electrochemical method like linear sweep voltammetry (LSV) and chronoamperometry (CA) was explored for water-splitting applications and 367 mA/g current density with 264 mV overpotential was achieved in the LSV plot. CA test was carried out for 10 h to reveal 189 mA/g current density and delivered 74% stability. Therefore, the present study describes different technique to extend electrochemical supercapacitor and water-splitting purposes. • A simple co-precipitation method used to synthesis CoSn(OH) 6 nanoparticles. • Higher ammonia additive revealed 269 F/g, 364 F/g from CV and GCD. • Higher ammonia additive revealed 8.12% capacitive and 91.88% diffusive contributions. • 91.33% capacitive retention, 90.38% columbic efficiency was calculated over 5000 cycles. • 367 mA/g current density with 264 mV over potential was achieved in LSV. [ABSTRACT FROM AUTHOR]