Structure, morphology and electrochemical behaviour of manganese oxides prepared by controlled decomposition of permanganate

Title: Structure, morphology and electrochemical behaviour of manganese oxides prepared by controlled decomposition of permanganate
Creator: Donne, S. W.; Hollenkamp, A. F.; Jones, B. C.
Relation: Journal of Power Sources Vol. 195, Issue 1, p. 367-373
Publisher Link: http://dx.doi.org/10.1016/j.jpowsour.2009.06.103
Publisher: Elsevier
Resource Type: journal article
Date: 2010
Description: Hydrothermal decomposition of permanganate, conducted in a range of pH-controlled solutions (from strongly acidic to strongly basic), is used to prepare manganese dioxides that are well-suited for use as supercapacitor electrode materials. While permanganate is thermodynamically unstable, the kinetics of its decomposition in an aqueous environment are very slow, until the temperature is raised to ~200 °C. Although the resultant materials are relatively crystalline and have low total pore volume, their prominent meso-porosity leads to good electrochemical performance. Best behaviour is obtained for material from permanganate decomposition in 0.01 M H₂SO₄ solution, for which composite electrodes (150 μm thick) yield ~150 F g⁻¹ at 5 mV s⁻¹ in a 9 M KOH electrolyte.
Subject: manganese dioxide; birnessite; supercapacitor; composite electrode; pseudo-capacitance
Identifier: uon:9682
Identifier: http://hdl.handle.net/1959.13/923211
Identifier: ISSN:0378-7753
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