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

Mardi, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s10008-018-4060-6
  3. Abstract:
  4. 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°. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature
  5. Keywords:
  6. Nanostructure ; Capacitance ; Chemical activation ; Chemical analysis ; Crystal structure ; Fourier transform infrared spectroscopy ; Manganese oxide ; Nanostructures ; Scanning electron microscopy ; Supercapacitor ; Thick films ; Chemical compositions ; Electrochemical activation ; Electrochemical data ; Electrodeposition methods ; Flexible ; MnO2 ; Solid-state supercapacitors ; Supercapacitor electrodes ; Electrochemical electrodes
  7. Source: Journal of Solid State Electrochemistry ; Volume 22, Issue 11 , 2018 , Pages 3507-3514 ; 14328488 (ISSN)
  8. URL: https://link.springer.com/article/10.1007/s10008-018-4060-6