Hydrothermal synthesis of SnO_2-V_2O_5 mixed oxide and electrochemical screening of carbon nano-tubes (CNT), V_2O_5, V_2O_5-CNT, and SnO_2-V_2O_5-CNT electrodes for supercapacitor applications

摘要

Nano-scaled SnO_2-V_2O_5 mixed oxide is synthesized by a hydrothermal method in an autoclave. For comparative evaluation, V_2O_5 single oxide is prepared by a conventional process from ammonium vanadate. The capacitive behaviour of the following electrodes is studied by cyclic voltammetry in 0.1M KCl solutions: carbon nano-tubes (CNT), V_2O_5, V_2O_5-CNT, and SnO_2-V_2O_5-CNT. At a scan rate of 100mVs~(-1), the SnO_2-V_2O_5-CNT electrode provides the best performance, viz., 121.4 F g~(-1). The nano-scaled mixed oxide is characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and Raman spectra.