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Improved supercapacitive performance of low pore size and highly stable nanostructured NiCo2O4 electrodes

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Abstract

The nanostructured nickel cobaltite has been synthesized by a cost-effective facile hydrothermal method and demonstrated excellent electrochemical capacitive properties. The microstructural properties of as-synthesized nanostructured nickel cobaltite are probed with various analytical techniques, viz. XRD, XPS, BET, SEM, and TEM. A high-intensity (311) orientation along with other characteristic peaks observed in XRD spectrum corresponds to cubic spinel NiCo2O4 (NCO) phase with Fd\( \overline{3} \)m (227) symmetry. The NCO material is comprised of homogenous distribution of cuboid-shaped nanocrystalline particles as observed from TEM analysis. Brunauer-Emmett-Teller (BET) analysis evidenced that the prepared nickel cobaltite material possesses a high specific surface area 138 m2 g−1 with an average pore radius 4 nm. The high surface area and low average pore size generally offer more electroactive sites for Li-ion adsorption-desorption and avoid the stress upon the structure of the compound which resulted exemplary electrochemical performance. The NCO electrode delivered a superior specific capacitance of 2040 F g−1 at 1 A g−1 and retained 85.5% of its capacitance even after 5000 cycles. The desirable integrated quality such as long calendar life with high capacitance of the newly fabricated electrode enables it to be a promising material for high-performance supercapacitor devices.

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Acknowledgements

The technical support provided by Prof. M. V. Shankar, Department of Materials Science and Nanotechnology, Yogivemana University, Kadapa, is greatly acknowledged.

Funding

One of the authors N. Varalakshmi gratefully acknowledges the University Grants Commission for providing UGC-BSRFELLOWSHIP Letter No. F. 25-1/2014-15 (BSR)/7-187/2007(BSR) dated: 13-03-2015.

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Authors and Affiliations

  1. Electroanalytical Lab, Department of Chemistry, Sri Venkateswara University, Tirupati, 517502, India

    N. Varalakshmi & N. Y. Sreedhar

  2. Shenzhen Engineering Laboratory of Flexible Transparent Conductive Films, Department of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China

    A. Lakshmi Narayana

  3. Thin Films Laboratory, Department of Physics, Sri Venkateswara University, Tirupati, 517502, India

    O. M. Hussain

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  1. N. Varalakshmi
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  2. A. Lakshmi Narayana
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  3. O. M. Hussain
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Correspondence to N. Y. Sreedhar.

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Varalakshmi, N., Narayana, A.L., Hussain, O.M. et al. Improved supercapacitive performance of low pore size and highly stable nanostructured NiCo2O4 electrodes. J Solid State Electrochem 25, 1411–1420 (2021). https://doi.org/10.1007/s10008-021-04911-3

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  • DOI: https://doi.org/10.1007/s10008-021-04911-3

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