Oxidative precipitation of ruthenium oxide for supercapacitors: Enhanced capacitive performances by adding cetyltrimethylammonium bromide
| Autor: | Tsan-Yao Chen, I-Li Chen, Chi-Chang Hu, Tsang-Lang Lin, Yu Chen Wei |
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| Rok vydání: | 2014 |
| Předmět: |
X-ray absorption spectroscopy
Materials science Renewable Energy Sustainability and the Environment Annealing (metallurgy) Inorganic chemistry Energy Engineering and Power Technology Ruthenium oxide law.invention chemistry.chemical_compound symbols.namesake chemistry Nanocrystal Chemical engineering Bromide law symbols Crystallite Electrical and Electronic Engineering Physical and Theoretical Chemistry Crystallization Raman spectroscopy |
| Zdroj: | Journal of Power Sources. 268:430-438 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2014.06.035 |
| Popis: | Thermally stable and porous RuO 2 · x H 2 O with superior rate-retention capability is prepared by the H 2 O 2 -oxidative precipitation method modified with the cetyltrimethylammonium bromide (CTAB) template. The specific capacitance and rate-retention of RuO 2 · x H 2 O are considerably enhanced by the CTAB modification and annealing at 200 °C because of extremely localized crystallization and pore opening of slightly sintered RuO 2 · x H 2 O nanoparticles trapped with CTAB. This unique structure, confirmed by the X-ray absorption spectroscopic (XAS), Raman spectroscopic, and transmission electron microscopic (TEM) analyses, favors the utilization of RuO 2 · x H 2 O nanocrystals and increases the electrolyte accessibility in comparing with RuO 2 · x H 2 O without CTAB modification. The preferential orientation growth along the {101} facet of RuO 2 nanocrystals in some local regions is acquired by the CTAB modification and annealing in air at temperatures ≥350 °C. Such preferential orientation growth of RuO 2 crystallites is attributable to the oxidation of trapped surfactants during the thermal annealing process, which adsorb on the high surface energy planes of RuO 2 . |
| Databáze: | OpenAIRE |
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