Electrochemical properties of CNT doped nanoporous tin oxide hybrid electrode formed on cold spray tin coating for supercapacitor application

In this study, a hybrid electrode was formed from a nanoporous tin oxide thin film and carbon nanotubes on a tin cold sprayed coating. Structural investigations were performed by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Characterization results showed that using the pulsed electrophoretic method for the deposition of carbon nanotubes on nanoporous tin oxide leads to the formation of uniform distribution of carbon nanotube particles on the surface. The electrochemical characteristics of the resultant electrode were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). The appropriate electrochemical performance of the hybrid electrode is attributed to high surface area and high conductivity due to the presence of carbon nanotubes. The presence of carbon nanotubes in the structure of porous tin oxide causes a significant increase in capacitance. The nanoporous tin oxide-CNT hybrid electrode had a specific capacitance of 0.036 F/cm(2) at 50 mV center dot s(-1), whiles the nanoporous tin oxide electrode had a capacitance of 0.011 F/cm(2) at the same scan rate. Also, the adsorption and desorption reaction of the hybrid electrode is largely controlled by penetration. The results demonstrated that the nanoporous tin oxide-CNT hybrid electrode could be potentially used in energy storage applications.