Title

Structural Evolution Of Multi-Walled Carbon Nanotube/Mno 2 Composites As Supercapacitor Electrodes

Keywords

Charge/discharge cycles; Manganese oxide; Multi-walled carbon nanotube; Structural evolution; Supercapacitor

Abstract

Multi-walled carbon nanotube (MWCNT)/MnO 2 supercapacitor electrodes containing MnO 2 nanoflakes in the MWCNT network are fabricated through the oxidation of manganese acetate with poly(4- styrenesulfonic acid) (PSS) dispersed MWCNTs. The structural evolution of the electrodes under charge/discharge (reduction/oxidation) cycles and its impact on the electrodes' electrochemical properties are evaluated. Structural evolution involves the dissolution of MnO 2 upon reduction, the diffusion of the reduced Mn species from the MWCNT network toward the electrolyte solution, and the deposition of MnO 2 on the electrode surface upon oxidation. Electrode structural changes, including the electrode dissolution and the growth of the MnO 2 crystals, are scan rate dependent and have deteriorating effect on the electrode's electrochemical properties including the specific capacitance and cyclic stability. © 2011 Elsevier Ltd. All Rights Reserved.

Publication Date

1-1-2012

Publication Title

Electrochimica Acta

Volume

59

Number of Pages

548-557

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.electacta.2011.11.017

Socpus ID

84655167166 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84655167166

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