Porous NiO/Ag composite film for electrochemical capacitor application
2011
Abstract A highly porous NiO/Ag composite film is prepared by the combination of chemical bath deposition and silver mirror reaction. The as-prepared NiO/Ag composite film has an interconnecting reticular morphology made up of NiO flakes with highly dispersed Ag nanoparticles of about 6 nm. The pseudocapacitive behavior of the NiO/Ag composite film is investigated by cyclic voltammograms (CV) and galvanostatic charge–discharge tests in 1 M KOH. The NiO/Ag composite film exhibits weaker polarization, higher specific capacitance and better cycling performance as compared to the unmodified porous NiO film. The specific capacitance of the porous NiO/Ag composite film is 330 F g −1 at 2 A g −1 and 281 F g −1 at 40 A g −1 , respectively, much higher than that of the unmodified porous NiO film (261 F g −1 at 2 A g −1 and 191 F g −1 at 40 A g −1 ). The enhancement of pseudocapacitive properties is due to highly dispersed Ag nanoparticles in the composite film, which improves the electric conductivity of the film electrode.
Keywords:
- Electrolytic capacitor
- Dielectric spectroscopy
- Nanoparticle
- Capacitor
- Cycling
- Chemical bath deposition
- Pseudocapacitance
- Inorganic chemistry
- Chemistry
- Capacitance
- Electrochemistry
- Non-blocking I/O
- Scanning electron microscope
- Electrode
- Chemical engineering
- Transmission electron microscopy
- Analytical chemistry
- Mineralogy
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