Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 15, Issue 3, Pages 587-592Publisher
SPRINGER
DOI: 10.1007/s10008-010-1128-3
Keywords
Electrochemical capacitors; Porous tricobalt tetraoxide; Polystyrene spheres; Carbowax; Templates
Categories
Funding
- National Natural Science Foundation of China [50972165]
- Hunan Provincial Nonferrous Group [Y 2008-01-007]
- Hunan Provincial Education Department [09C1055]
Ask authors/readers for more resources
Meso-macroporous Co3O4 electrode is synthesized by drop coating with a mixed solution containing Co(OH)(2) colloid, polystyrene spheres, and carbowax (namely polyethylene glycol), followed by calcining at 400 A degrees C to remove polystyrene spheres and carbowax. For comparison, nonporous Co3O4 and mesoporous Co3O4 electrodes are prepared by drop coating with Co(OH)(2) colloid and with a mixed solution containing Co(OH)(2) colloid and carbowax under the same condition, respectively. Capacitive property of these electrodes is measured by cyclic voltammetry, potentiometry and electrochemical impedance spectroscopy. The results show that meso-macroporous Co3O4 electrode exhibits larger specific capacitance than those of nonporous Co3O4 electrode and mesoporous Co3O4 electrode at various current densities. The specific capacitance of meso-macroporous Co3O4 electrode at the current density of 0.2 A g(-1) is 453 F g(-1). Meanwhile, meso-macroporous Co3O4 electrode possesses the highest specific capacitance retention ratio at the current density ranging from 0.2 to 1.0 A g(-1), indicating that meso-macroporous Co3O4 electrode suits to high-rate charge-discharge.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available