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Journal of Solid State Electrochemistry

, Volume 22, Issue 11, pp 3507–3514 | Cite as

Fabrication and the electrochemical activation of network-like MnO2 nanoflakes as a flexible and large-area supercapacitor electrode

  • Saeed Mardi
  • Omran Moradlou
  • Alireza Z. Moshfegh
Original Paper
  • 118 Downloads

Abstract

Porous network-like MnO2 thick films are successfully synthesized on a flexible stainless steel (SS) mesh using a simple and low-cost electrodeposition method followed by an electrochemical activation process. Morphology, chemical composition, and crystal structure of the prepared electrodes before and after the activation process are determined and compared by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) analyses. The results show that the implementation of the electrochemical activation process does not change the chemical composition and crystal structure of the films, but it influences the surface morphology of the MnO2 thick layer to a flaky nanostructure. Based on the electrochemical data analysis, the maximum specific capacitance of 1400 mF (381 F g−1) and 3700 mF (352 F g−1) are measured for small (2.6 cm2) and large (10 cm2) surface area electrodes, respectively. In addition, a flexible symmetric MnO2//MnO2 solid-state supercapacitor shows a capacitance of 0.3 F with about 98% retention at different bending angles from 0 to 360°.

Keywords

Supercapacitor MnO2 Electrochemical activation Nanostructure Flexible 

Notes

Acknowledgements

The authors would like to thank Dr. M. Qorbani for valuable and useful discussions. Financial assistance of Research and Technology Council of Sharif University of Technology and partial support from Iran National Science Foundation through project number 940009 is greatly acknowledged.

Supplementary material

10008_2018_4060_MOESM1_ESM.docx (2.1 mb)
ESM 1 (DOCX 2118 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of PhysicsSharif University of TechnologyTehranIran
  2. 2.Department of Chemistry, Faculty of Physics and ChemistryAlzahra UniversityTehranIran
  3. 3.Institute for Nanoscience and NanotechnologySharif University of TechnologyTehranIran

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