Co2SnO4/activated carbon composite electrode for supercapacitor

A new kind of Co2SnO4-based electrode materials for supercapacitor was synthesized by co-precipitation method. The microstructure and surface morphology of Co2SnO4 were characterized by X-ray diffraction and scanning electron microscopy, respectively. Cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopy were employed for the determination of specific capacitance and the equivalent series resistance of Co(2)Sna(4)/activated carbon composite electrode in KCl solution. It was shown that the composite electrode with 25 wt% Co(2)Sna(4) had excellent specific capacitance up to 285.3 F g(-1) at the current density of 5 rnA cm(-2). In addition, the composite electrode exhibited excellent long-term stability and, after 1000 cycles, 70.6% of initial capacitance was retained. Regarding the low cost, easy preparation, steady performance and environment friendliness, Co2SnO4/activated carbon composite electrode could have potentially promising application for supercapacitor. (C) 2012 Elsevier B.V. All rights reserved.