L-cysteine-assisted synthesis of ruthenium sulfide/thermally reduced graphene oxide nanocomposites: Promising electrode materials for high-performance energy storage applications
- Authors
- Bolagam, Ravi; Um, Sukkee
- Issue Date
- Aug-2018
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Ruthenium sulfide; Thermally reduced graphene oxide; Supercapacitor; Hydrothermal method; Electrochemical impedance spectrum
- Citation
- ELECTROCHIMICA ACTA, v.281, pp.571 - 581
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 281
- Start Page
- 571
- End Page
- 581
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/16783
- DOI
- 10.1016/j.electacta.2018.06.004
- ISSN
- 0013-4686
- Abstract
- This paper describes a facile, single-step hydrothermal method to prepare ruthenium sulfide/thermally reduced graphene oxide (RuS₂/TRGO) nanocomposites. In this synthesis procedure, aqueous solutions of RuCl₃, L-cysteine, and graphene oxide are employed as the metal, sulfur, and graphene sources, respectively. The chemical structures and morphologies of the nanocomposites are characterized by Xray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. Cyclic voltammetry, galvanostatic charge-discharge cycling, and electrochemical impedance spectroscopy are used to examine their electrochemical performances. The RuS₂ nanoparticles (similar to 10 nm) uniformly disperse on the surfaces of the TRGO layers to form the RuS₂/TRGO composite, which adequately inhibits aggregation of the RuS₂ to fully exploit its impressive electrochemical activity and capacitance as a pseudocapacitive electrode material. The combination of the TRGO interconnected conductive networks and uniformly anchored RuS₂ generates a specific capacitance of 193 F g(-1) at a 5 mV s(-1) scan rate, 150 F g(-1) at a 0.5 A g(-1) current density, good rate capability (57.3% retention at 6.25 A g(-1)), and reasonable cycle stability (90% retention of capacitance over 2000 cycles at a current density of 0.75 A g(-1)). Further, the RuS₂/TRGO-30 composite electrode achieves energy densities of 20.84 and 6.11 Wh kg(-1) at power densities of 250 and 3666.7 W kg(-1), respectively. The RuS₂/TRGO composites are promising for high-level energy storage applications because of their superior electrochemical activities.
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