Fabrication and characterization of titania nanotube/cobalt sulfide supercapacitor electrode in various electrolytes

By Rupashree S. Ray and Biplab Sarma and Abraham L. Jurovitzki and Mano Misra
Published in Chemical Engineering Journal NULL 2015

Abstract

A facile electrochemical technique has been employed to fabricate titania nanotube (T-NT)/cobalt sulfide (CoS) composite electrode for high performance supercapacitor application. The morphology and phase evaluation of the electrode were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques. The pseudocapacitance behavior of the T-NT/CoS composite electrode has been evaluated in four different aqueous electrolytes: KOH, KCl, Na2SO4 and Na2SO3. Cyclic voltammetric studies in aqueous \KOH\ electrolyte indicated that a very high specific capacitance (370 F g?1) can be achieved in this electrolyte together with excellent cycle stability even after 300 consecutive \CV\ cycles. Further, the capacitance behavior of the T-NT/CoS electrode in KCl, Na2SO4, and Na2SO3 electrolytes exhibited a mixture of electric double layer (EDL) and redox-induced supercapacitance as displayed in the cyclic voltammetry, galvanostatic charge

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