Facile in-situ etching current collector prepares corresponding oxide or sulfide, which is directly used as faradic electrode material, supplying faster electron transportation and better connection, and thus displaying good supercapacitor performance. Here, we prepare CuxS via etching copper foam and investigate the influence of etching time on the morphology and electrochemical performance. The results show that compared with the nano-rod CuxS-1h/CF, nano-rod/wire CuxS-2h/CF and block/nanorod CuxS-4h/CF, the nano-rod/ribbon CuxS-3h/CF electrode exhibits the highest specific capacity (448.8Cg−1 at current density of 5mAcm−2). We fabricate asymmetric supercapacitor based on CuxS-3h/CF as positive electrode and AC as negative electrode to further evaluate the supercapacitor property and the device achieves a high energy density of 35 Wh kg−1 at power density of 266Wkg−1. Furthermore, the outstanding cycling stability of 88% capacitance retention after 5000 charge-discharge cycles more enable the CuxS-3h/CF become promising faradic electrode material.