High-yield preparation of molybdenum disulfide/polypyrrole hybrid nanomaterial with non-covalent interaction and its supercapacitor application

Molybdenum disulfide (MoS2) incorporated with a conducting polymer can be a promising nanomaterial for use as low-cost electrodes in supercapacitors. MoS2 nanosheets are generally prepared by the high-pressure hydrothermal method, which has a few drawbacks such as low exfoliation yield, safety issues, and longtime processing. Herein, we report a simple and effective method for the high-yield (similar to 72.5%) preparation of a MoS2/polypyrrole (MPY) hybrid nanomaterial via sonochemical exfoliation of ground bulk MoS2 in a polar aprotic solvent and subsequent chemical oxidative polymerization of pyrrole (PY) onto the MoS2 nanosheets. The strong non-covalent Mo-N bonding lowers the interfacial resistance, and the morphology of polypyrrole (PPY) can be easily controlled by varying the PY content. The MPY hybrid nanomaterial exhibited a maximum surface conductivity of 991 S sq., which is very high compared to that of pristine MoS2 nanosheet (similar to 3.6 x 10(-7) S sq.). When used in supercapacitors, the specific capacitance of the hybrid nanomaterial is 312 F g(-1). Thus, improved capacitance retention with increase in the scan rate and enhanced diffusion process during electrochemical reactions result in good supercapacitor performance, which is important for the mass production of energy-storage devices. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The MoS2/polypyrrole (MPY) hybrid nanomaterial prepared by sonochemical exfoliation and chemical oxidative polymerization exhibits high surface conductivity and excellent specific capacitance, showing promising performance in supercapacitors.