Crystallization design of MnO2 towards better supercapacitance

Yuanjian Zhang; Congting Sun; Pai Lu; Keyan Li; Shuyan Song; Dongfeng Xue

doi:10.1039/C2CE25610J

Crystallization design of MnO₂ towards better supercapacitance†

Yuanjian Zhang,^a Congting Sun,^ab Pai Lu,^a Keyan Li,^a Shuyan Song^b and Dongfeng Xue*^ab

Author affiliations

* Corresponding authors

^a School of Chemical Engineering, Dalian University of Technology, Dalian, China
E-mail: dongfeng@ciac.jl.cn

^b State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China

Abstract

Nanostructured manganese oxides with different crystallization behaviors were fabricated by a simple redox reaction between KMnO₄ and NaNO₂ aqueous solution. MnO₂ nanostructures with sphere-, rod-, wire-, plate- and flower-like morphologies were crystallized, and the relationship between crystallization characteristics and their electrochemical performances were studied. The electrochemical energy storage behaviors of these samples were investigated by cyclic voltammetry and galvanostatic charge–discharge measurements processed using noncorrosive Na₂SO₄ as the electrolyte. A maximum specific capacitance 200 F g⁻¹ was obtained for poorly crystallized α-MnO₂ at a current density of 1 A g⁻¹. For different crystallographic MnO₂ phases, their specific capacitance values increase in the order: β < γ < δ < α, meanwhile, for any particular MnO₂ phase, their electrochemical energy storage performances decrease with increasing crystalline nature and particle size.

This article is part of the themed collection: A celebration of 25 volumes of CrystEngComm

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Article information

DOI: https://doi.org/10.1039/C2CE25610J
Article type: Paper
Submitted: 20 Apr 2012
Accepted: 12 Jun 2012
First published: 13 Jun 2012

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CrystEngComm, 2012,14, 5892-5897

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Crystallization design of MnO₂ towards better supercapacitance

Y. Zhang, C. Sun, P. Lu, K. Li, S. Song and D. Xue, CrystEngComm, 2012, 14, 5892 DOI: 10.1039/C2CE25610J

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