Co_2SnO_4/activated carbon composite electrode for supercapacitor

摘要

A new kind of Co_2SnO_4-based electrode materials for supercapacitor was synthesized by co-precipitation method. The microstructure and surface morphology of Co_2SnO_4 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_2SnO_4/activated carbon composite electrode in KG solution. It was shown that the composite electrode with 25 wt% Co_2SnO_4 had excellent specific capacitance up to 285.3 F g~(-1) at the current density of 5 mA 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, Co_2SnO_4/activated carbon composite electrode could have potentially promising application for supercapacitor.