Abstract
Hybrid electrochemical capacitors of anhydrous IrO2 nanocrystal and hydrous RuO2 have been prepared via metal organic chemical vapor deposition (MOCVD) and electrochemical deposition. The structures were studied using scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM) and X-Ray Diffraction (XRD). The electrochemical properties were measured by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). In a miniaturized configuration, the CVD grown structure provides a connecting backbone of electron paths and open channels for ion migration to facilitate the charge delivery or acceptance from the electrodeposited hydrous RuO2 of high pseudocapacitance. The sample of thermally reduced nanocrystals encased in RuO2·0.46H2O exhibits a total capacitance of ~484.75 Fg-1 at 10 mVs-1, higher than that of the RuO2 0.46H2O coated as-grown nanocrystals of ~352 Fg-1.
Original language | English |
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Pages (from-to) | 552-559 |
Number of pages | 8 |
Journal | Science of Advanced Materials |
Volume | 2 |
Issue number | 4 |
DOIs | |
Publication status | Published - Dec 2010 |
Keywords
- Anhydrous IrO
- Capacitance
- Hydrous RuO
- Nanocrystal
- Thermal reduction