Supercapacitor Electrodes Obtained by Directly Bonding 2D MoS2 on Reduced Graphene Oxide

Layered molybdenum disulfide (MoS 2 ) is deposited by microwave heating on a reduced graphene oxide (RGO). Three concentrations of MoS 2 are loaded on RGO, and the structure and morphology are characterized. The first layers of MoS 2 are detected as being directly bonded with the oxygen of the RGO by covalent chemical bonds (Mo‐O‐C). Electrochemical characterizations indicate that this electroactive material can be cycled reversibly between 0.25 and 0.8 V in 1 m HClO 4 solution for hybrids with low concentrations of MoS 2 layers (LCMoS 2 /RGO) and between 0.25 and 0.65 V for medium (MCMoS 2 /RGO) and high concentrations (HCMoS 2 /RGO) of MoS 2 layers on graphene. The specific capacitance measured values at 10 mV s −1 are 128, 265, and 148 Fg −1 for the MoS 2 /RGO with low, medium, and high concentrations of MoS 2 , respectively, and the calculated energy density is 63 W h kg −1 for the LCMoS 2 /RGO hybrid. This supercapacitor electrode also exhibits superior cyclic stability with 92% of the specific capacitance retained after 1000 cycles.