Morphological and Electrochemical Cycling Effects in MnO2 Nanostructures by 3D Electron Tomography. (12th February 2014)

• Record Type: Journal Article
• Authors: Chen, Wei; Rakhi, Raghavan B.; Wang, Qingxiao; Hedhili, Mohamed N.; Alshareef, Husam N.
• Is Part Of: Advanced functional materials. Volume 24:Number 21(2014)
• Page Start: 3130
• Page End: 3143
• Publication Date: 2014-02-12
• Subjects: Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201303508
• Languages: English
• ISSNs: 1616-301X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>In this study, MnO₂ nanostructures with well‐controlled morphology and crystal phase are successfully prepared by chemical synthesis, and characterized by three‐dimensional electron tomography for use as supercapacitor electrode materials. The growth process of the various MnO₂ nanostructures is revealed in detail, and correlated to their electrochemical performance as supercapacitor materials. The specific capacitance of MnO₂ electrodes is found to be strongly correlated with the inner morphology and crystal phase of the MnO₂ nanostructures. Furthermore, it is demonstrated that the increased capacity with electrochemical cycling of the materials is due to the formation of defective regions embedded in the MnO₂ nanostructures; these regions form during electrochemical cycling of the electrodes, resulting in increased porosity, surface area, and consequently, increased electrochemical capacity.</p> </abstract>