Title

Structural evolution of multi-walled carbon nanotube/MnO2 composites as supercapacitor electrodes

Authors

Authors

Q. Li; J. M. Anderson; Y. Q. Chen;L. Zhai

Comments

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Abbreviated Journal Title

Electrochim. Acta

Keywords

Multi-walled carbon nanotube; Manganese oxide; Charge/discharge cycles; Structural evolution; Supercapacitor; PERFORMANCE ELECTROCHEMICAL ELECTRODES; CHARGE-STORAGE PROPERTIES; MANGANESE OXIDE; ASYMMETRIC SUPERCAPACITORS; HYDROTHERMAL SYNTHESIS; MNO2 ELECTRODES; HIGH-POWER; CAPACITORS; ALPHA-MNO2; DEPOSITION; Electrochemistry

Abstract

Multi-walled carbon nanotube (MWCNT)/MnO2 supercapacitor electrodes containing MnO2 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 MnO2 upon reduction, the diffusion of the reduced Mn species from the MWCNT network toward the electrolyte solution, and the deposition of MnO2 on the electrode surface upon oxidation. Electrode structural changes, including the electrode dissolution and the growth of the MnO2 crystals, are scan rate dependent and have deteriorating effect on the electrode's electrochemical properties including the specific capacitance and cyclic stability. Published by Elsevier Ltd.

Journal Title

Electrochimica Acta

Volume

59

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

548

Last Page

557

WOS Identifier

WOS:000299911500078

ISSN

0013-4686

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