Performance evaluation of asymmetric supercapacitor based on Ti3C2Tx-paper

Abstract Ti 3 C 2 T x is promising negative electrode materials for asymmetric supercapacitor (ASC). The Ti 3 C 2 T x sheets are obtained by etching Ti 3 AlC 2 powders in the mixture solution of HCl and LiF, then vacuum filtrated to achieve a free-standing Ti 3 C 2 T x -paper. The electrochemical performance of Ti 3 C 2 T x -paper was measured and a high volumetric capacitance of 295.4 F cm −3 was achieved. Meanwhile, it exhibited a high capability rate of 79.7% from 2 mV s −1 to 100 mV s −1 and long cycle life with 94.4% retention of its initial after charged and discharged for 15000 cycles at a current density of 10 A g −1 . ASC devices were fabricated using Ti 3 C 2 T x -paper as negative electrode and carbonized filter paper as positive electrode. The energy density and power density of ASC device are 4.5 Wh kg −1 and 1.3 kW kg −1 , respectively. The application of the device has been demonstrated by lighting red light emitting diode, endowing prospect of the Ti 3 C 2 T x -paper as negative electrode for supercapacitors.