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Sodium dodecyl sulphate assisted hydrothermally synthesized hexagonal prismatic nanocrystalline zinc cobaltite for high performance supercapacitors

  • N. Varalakshmi
  • A. Lakshmi Narayana
  • D. Rekha
  • O. M. Hussain
  • N. Y. SreedharEmail author
Original Paper


Hexagonal prismatic nanocrystalline ZnCo2O4 (HPNZCO) has been successfully synthesized via sodium dodecyl sulphate-assisted facile hydrothermal method. The crystallographic analysis revealed that the obtained compound is in pure ZnCo2O4 phase with Fd \( \overline{\ 3} \)m space group and the estimated crystallite size is 10 nm. The surface morphological features depict homogenously distributed hexagonal prism grains with an average grain size of less than 10 nm. TEM analysis revealed that the hexagonal morphology prisms are closely packed together as a group and facilitate large electrochemical active sites for the redox reactions and accelerate ion transport during the electrochemical process. The HPNZCO electrode delivered the highest specific capacitance (CS) of 1060 F g−1 at a current density of 1 A g−1 and retained 93% of capacitance even after 5000 cycles, suggesting its excellent cycling stability. The demonstrations infer that the HPNZCO electrode opens up new opportunities for next-generation high performance supercapacitors.


Binary metal oxides Hexagonal prismatic nanocrystalline ZnCo2O4 (HPNZCO) Hydrothermal method Microstructure Electrochemical properties Supercapacitors 



One of the Author N.Varalakshmi gratefully acknowledge the university grants commission for providing BSR fellowship. Also,the tecchnical support provided by prof.M.V.Shankar,Department of materials science and nanotechnology ,yogivemana university ,kadapa is greatly acknowledged.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • N. Varalakshmi
    • 1
  • A. Lakshmi Narayana
    • 2
  • D. Rekha
    • 1
  • O. M. Hussain
    • 2
  • N. Y. Sreedhar
    • 1
    Email author
  1. 1.Electroanalytical Laboratory, Department of ChemistrySri Venkateswara UniversityTirupatiIndia
  2. 2.Thin Films Laboratory, Department of PhysicsSri Venkateswara UniversityTirupatiIndia

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