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

Author(s)

da Silveira Firmiano, Edney Geraldo ^[1] ; Rabelo, Adriano C. ^[1] ; Dalmaschio, Cleocir J. ^[1] ; Pinheiro, Antonio N. ^[1] ; Pereira, Ernesto C. ^[1] ; Schreiner, Wido H. ^[2] ; Leite, Edson Robeto ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Chem, BR-13560 Sao Carlos, SP - Brazil

^[2] Univ Fed Parana, Dept Phys, BR-80060000 Curitiba, Parana - Brazil

• Document type: Journal article
• Source: ADVANCED ENERGY MATERIALS; v. 4, n. 6 APR 2014.
• Web of Science Citations: 208

Abstract

Layered molybdenum disulfide (MoS2) is deposited by microwave heating on a reduced graphene oxide (RGO). Three concentrations of MoS2 are loaded on RGO, and the structure and morphology are characterized. The first layers of MoS2 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 HClO4 solution for hybrids with low concentrations of MoS2 layers (LCMoS2/RGO) and between 0.25 and 0.65 V for medium (MCMoS2/RGO) and high concentrations (HCMoS2/RGO) of MoS2 layers on graphene. The specific capacitance measured values at 10 mV s(-1) are 128, 265, and 148 Fg(-1) for the MoS2/RGO with low, medium, and high concentrations of MoS2, respectively, and the calculated energy density is 63 W h kg(-1) for the LCMoS2/RGO hybrid. This supercapacitor electrode also exhibits superior cyclic stability with 92% of the specific capacitance retained after 1000 cycles. (AU)

• FAPESP's process: 13/02468-0 - Synthesis of two-dimensional materials formed by layered transition metal dichalcogenides and it application on electrochemical system for energy generation and storage
• Grantee: Edson Roberto Leite
• Support Opportunities: Regular Research Grants