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Facile synthesis of layered reduced graphene oxide–copper sulfide (rGO-CuS) hybrid electrode for all solid-state symmetric supercapacitor

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Abstract

A straightforward process for synthesis of hybrid porous electrode material composed of reduced graphene oxide (rGO) and copper sulfide (CuS) with layered structure on the stainless steel substrate is developed. As-synthesized hybrid electrode shows hexagonal crystal structure of CuS with 77 m2 gm−1 specific surface area and 22 nm average pore size. The specific capacitance obtained with rGO-CuS5 hybrid electrode is 1201 F g−1 at the sweep rate of 5 mV s−1 in 1 M LiClO4 aqueous electrolyte. The majority of charge stored by diffusion-controlled process indicates benefits of layered structures for solid-state energy storage. The rGO-CuS5-based hybrid symmetric supercapacitor delivers a specific capacitance (Cs) as high as 109 F g−1 at a sweep rate of 5 mV s−1 with polyvinyl alcohol (PVA)-LiClO4 gel electrolyte. Also, the specific energy of 44 Wh kg−1 and specific power of 1.4 kW kg−1 with 87% stability after 6000 cycles at an applied current of 5 mA are obtained. The simple process of synthesis of layered hybrid electrode material for flexible supercapacitor promises its use in smart textile and wearable electronic devices.

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Funding

The Department of Science and Technology, Govt. of India, financially supported this study through a research project, Materials for Energy Storage (sanction no. DST/TMD/MES.2K17/04 (C&G)) dated 17 July 2018. Also, this research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2018R1A6A1A03023788).

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Authors and Affiliations

  1. Centre for Interdisciplinary Research, D. Y. Patil Education Society, Kolhapur, 416006, India

    Dhanaji B. Malavekar, Vikas J. Mane, Shital B. Kale, Umakant M. Patil & Chandrakant D. Lokhande

  2. Department of Electronics Communication and Computer Engineering, Chonnan National University, Gwangiu, 500757, South Korea

    Vaibhav C. Lokhande

  3. Department of Polymer Science and Engineering, Korea National University of Transportation, Chungju, 380-702, South Korea

    Ravindra N. Bulakhe & Insik In

  4. Department of IT Convergence (Brain Korea PLUS 21), National University of Transportation, Chungju, 380-702, South Korea

    Insik In

Authors
  1. Dhanaji B. Malavekar
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  2. Vaibhav C. Lokhande
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  3. Vikas J. Mane
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  4. Shital B. Kale
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  5. Ravindra N. Bulakhe
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  6. Umakant M. Patil
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  7. Insik In
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  8. Chandrakant D. Lokhande
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Correspondence to Chandrakant D. Lokhande.

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Highlights

1. The sequential layered hybrid nanostructure of rGO and CuS with specific surface area of 77 m2 gm−1 is synthesized by a facile successive ionic layer adsorption and reaction method.

2. The rGO-CuS electrode stores charges through diffusion-controlled process at low sweep rate.

3. The rGO-CuS//rGO-CuS supercapacitor device shows the highest specific energy 44 Wh kg−1 and specific power 1.4 kW kg−1.

4. The rGO-CuS electrode-based symmetric supercapacitor device exhibits good cycling stability (87%) and also retains 90% specific capacitance after bending.

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Malavekar, D.B., Lokhande, V.C., Mane, V.J. et al. Facile synthesis of layered reduced graphene oxide–copper sulfide (rGO-CuS) hybrid electrode for all solid-state symmetric supercapacitor. J Solid State Electrochem 24, 2963–2974 (2020). https://doi.org/10.1007/s10008-020-04713-z

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  • DOI: https://doi.org/10.1007/s10008-020-04713-z

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