High-yield preparation of molybdenum disulfide/polypyrrole hybrid nanomaterial with non-covalent interaction and its supercapacitor application
- Authors
- Kim, Y.K.; Jeon, H.; Han, D.; Shin, K.-Y.
- Issue Date
- Jul-2021
- Publisher
- Elsevier Ltd
- Keywords
- Chemical oxidative polymerization; High-yield production; Molybdenum disulfide; Polypyrrole; Supercapacitor; Surface conductivity
- Citation
- Journal of Alloys and Compounds, v.868
- Journal Title
- Journal of Alloys and Compounds
- Volume
- 868
- URI
- https://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/40676
- DOI
- 10.1016/j.jallcom.2021.159263
- ISSN
- 0925-8388
1873-4669
- Abstract
- 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 long-time processing. Herein, we report a simple and effective method for the high-yield (~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 (~3.6 × 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. © 2021 Elsevier B.V.
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