- 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
- Reviewed
- Hits: 995
- Visitors: 953
- Downloads: 0
Thumbnail | File | Description | Size | Format |
---|