In-situ growth of nanowire WO_(2.72) on carbon cloth as a binder-free electrode for flexible asymmetric supercapacitors with high performance

For the first time,WO_(2.72) nanowires were in-situ grown on carbon cloth by a simple solvothermal reaction.The nanowire WO_(2.72)/carbon cloth(NW WO_(2.72)/CC) electrode showed good electrochemical performance with specific capacitance(C_s) reaching up to 398 F g^(-1) at a current density of 2 A g^(-1).The capacitance of 240 F g^(-1) was retained at a high current density of 16 A g^(-1).To further evaluate the energy storage performance,flexible asymmetric supercapacitors(FASC_s) were fabricated using the activated carbon/carbon cloth(AC/CC) as negative electrode and NW WO_(2.72)/CC as positive electrode,respectively.The FASC_s delivered a high energy density of 28 Wh kg^(-1) at a power density of 745 W kg^(-1) and 13 Wh kg^(-1) even at a high power density of 22.5 k W kg^(-1).More impressively,81% of the specific capacitance of the FASC_s was retained after 10,000 cycles,indicating excellent cycle stability.This work indicates the NW WO_(2.72)/CC holds a great potential for application in energy storage devices.