In situ synthesis of ultrafine β-MnO2/polypyrrole nanorod composites for high-performance supercapacitors
- 8 June 2011
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 21 (29), 10965-10969
- https://doi.org/10.1039/c1jm11491c
Abstract
We report a remarkable observation that is at odds with the established notion that β-MnO2 was regarded as an undesirable candidate for supercapacitor applications. The specific capacitance of β-MnO2 can reach as high as 294 F g−1, which is comparable to the best crystallographic structure, like α-MnO2. The key is to substantially decrease the size of β-MnO2 powders to ultra small regime. We demonstrate a facile, simple, and effective approach to synthesizing ultrafine (2/polypyrrole nanorod composite powders for high-performance supercapacitor electrodes. Our observation may encourage a revisit of the other good or even bad candidate active materials if we can decrease their size to extremely small scales. In addition, the proposed synthetic mechanism and the developed synthetic strategy may provide design guidelines in synthesizing other energy storage materials toward ultrafine 1D nanostructures.Keywords
This publication has 24 references indexed in Scilit:
- Materials for electrochemical capacitorsNature Materials, 2008
- Charge Storage Mechanism of MnO2 Electrode Used in Aqueous Electrochemical CapacitorChemistry of Materials, 2004
- Hydrothermal Synthesis of Hydrous Crystalline RuO[sub 2] Nanoparticles for SupercapacitorsElectrochemical and Solid-State Letters, 2004
- Carbon materials for the electrochemical storage of energy in capacitorsCarbon, 2001
- Self-discharge and potential recovery phenomena at thermally and electrochemically prepared RuO2 supercapacitor electrodesElectrochimica Acta, 1997
- Manganese oxides for lithium batteriesProgress in Solid State Chemistry, 1997
- Hydrous Ruthenium Oxide as an Electrode Material for Electrochemical CapacitorsJournal of the Electrochemical Society, 1995
- A New Charge Storage Mechanism for Electrochemical CapacitorsJournal of the Electrochemical Society, 1995
- Physical electrochemistry of ceramic oxidesElectrochimica Acta, 1991
- “Inner” and “outer” active surface of RuO2 electrodesElectrochimica Acta, 1990