CoS nanowires grown on Ti₃C₂T_x are promising electrodes for supercapacitors: High capacitance and remarkable cycle...

Benefitting from the large interlayer spacing, ultrahigh conductivity and abundant surface chemistry, Ti₃C₂T_x has been a promising electrode material for supercapacitors (SCs). CoS has attracted much attention due to its low cost, weak Co-S bond and relatively high theoretical capacity. Herein, CoS nanowires were grown on few-layered Ti₃C₂T_x by one-step solvothermal method as a SC electrode. Within the composite, Ti₃C₂T_x could function as conductive network and buffer matrix to provide ultra-fast electronic transport and relieve volume expansion of CoS nanowires. Simultaneously, the active CoS nanowires with high capacitance act as interlayer spacer to restrain the restacking of Ti₃C₂T_x nanosheets. As a result, CoS/Ti₃C₂T_x-5 electrode exhibits a remarkable improvement specific capacitance of 528 F g^-1 at a current density of 1 A g^-1 and ultrahigh capacitance retention of 99.3% after 20 000 cycles at a current density of 10 A g^-1. The attempts and efforts made in this work provide a prototype for achieving excellent electrochemical properties.