Electrochemical synthesis and characterization of nanostructured tin oxide for electrochemical redox supercapacitors

摘要

Amorphous nanostructured tin oxide (SnO_2) was potentiodynamically deposited onto inexpensive stainless steel (SS) electrode. Potentiodynamic deposition was carried out at a scan rate of 200 mV s~(-1) from an electrolyte solution of 0.1 M tin dichloride + 0.5 M sodium nitrate + 0.4 M nitric acid. The SnO_2 deposited SS electrodes were characterized by cyclic voltammetry (CV) at various scan rates in 0.1 M Na_2SO_4 for electrochemical redox supercapacitors. A maximum specific capacitance (SC) of 285 F g~(-1) was obtained from CV at a scan rate of 10 mV s~(-1). For the same electrode, a SC value of 101 F g~(-1) was obtained even at a high scan rate of 200 mV s~(-1), indicating high power characteristics of the material. The SC was found to increase with the increase in specific mass of SnO_2. Long cycle-life and stability of SnO_2 were also demonstrated.