In this study, CoS/MnCo2O4-MnO2 (CMM) nanocomposites were synthesized by hydrothermal and then electrochemical deposition. Their electrochemical properties were systematically investigated for supercapacitors and energy-saving H-2 production. As an electrode material for supercapacitor, CMM demonstrates a specific capacitance of 2320F g(-1) at 1 A/g, and maintains a specific capacitance of 1216F g(-1) at 10 A/g. It also shows 72.8 % capacitance retention after 8000 cycles. The aqueous asymmetric supercapacitor exhibited high energy storage capacity (887.86F g(-1) specific capacitance at a curr...
