The amorphous CoMoS4 is prepared using a simple precipitation method and for the first time used as a supercapacitor material. Surprisingly, it possesses very good electrochemical behavior owing to its amorphous structure and multiple oxidation states. In a three-electrode system, the ratio capacitance of CoMoS4 sample can reach 661 F g(-1) at a current density of 1 A g(-1). In the actual application of CoMoS4, the CoMoS4 symmetric device shows the ratio capacitance of 142 F g(-1) at 2 A g(-1); the assembled CoMoS4//rGO hybrid supercapacitor also owns a high ratio capacitance of 68 F g(-1) at 1 A g(-1) with energy and power densities of 27.2 Wh kg(-1) at 400 W kg(-1) and 17 Wh kg(-1) at 2400 W kg(-1). Further the hybrid supercapacitor has good capacitance retention (86% after 10,000 cycles), low internal and Warburg resistances. (C) 2016 Elsevier B.V. All rights reserved.