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Engineered perovskite LaCoO3/rGO nanocomposites for asymmetrical electrochemical supercapacitor application

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Abstract

Here, we report the synthesis route of LaCoO3 and nanocomposite with reduced graphene oxide (rGO) via solvothermal approach. The study of structural phase, phase purity, surface oxidation states, morphological, and electrochemical properties of synthesized materials is performed via various techniques: X-ray diffraction, high-resolution transmission electron microscope, scanning electron microscope, and Potentiostat SP-150, etc. It is evident from the various results obtained that the oxygen vacancy and nanocomposite enhance the electrical conductivity and ion/electron transfer leading to fast charge storage mechanism that, in turn, significantly enhances the electrochemical performance. The electrode designed of pristine LaCoO3 delivered the specific capacitance of 225 F/g in comparison of nanocomposite LaCoO3/rGO electrode as 317 F/g at current density of 1.75 A/g and exhibited remarkable cycle life retention 95% and 96% after 1000 life charging discharging cycles, respectively. Furthermore, the designed asymmetric supercapacitor delivered the specific capacitance up to 38 F/g at current density of 2 A/g and held 76% retention after 5000 charging discharging cycles. The remarkable performance of nanocomposite materials indicates its propitious candidature for next-generation energy storage by overcoming the dependency on spinel-type structure material.

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Acknowledgements

The author (AKV1,2) is grateful to the Ministry of Education, Government of India for providing fellowship. The author (AK3) acknowledges the financial support of the Council of Scientific and Industrial Research (CSIR) [Grant No. 22(0778)/18/EMR-II], and Department of Science and Technology (DST) (Grant No. SR/FST/COLLEGE-/2020/997).

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Authors and Affiliations

  1. School of Material Science and Nanotechnology, National Institute of Technology Kurukshetra, Haryana, 136119, India

    Amit Kumar Vats & Ashavani Kumar

  2. Department of Physics, National Institute of Technology Kurukshetra, Haryana, 136119, India

    Amit Kumar Vats & Ashavani Kumar

  3. Department of Applied Sciences, National Institute of Technical Teachers Training and Research Chandigarh, Chandigarh, 160019, India

    Ashok Kumar

  4. Beamline Development and Application Section, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India

    Parasmani Rajput

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Vats, A.K., Kumar, A., Rajput, P. et al. Engineered perovskite LaCoO3/rGO nanocomposites for asymmetrical electrochemical supercapacitor application. J Mater Sci: Mater Electron 33, 2590–2606 (2022). https://doi.org/10.1007/s10854-021-07464-3

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  • DOI: https://doi.org/10.1007/s10854-021-07464-3

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