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Study on Ruthenium Oxides/Carbon Nanotube Electrodes for Electrochemical Supercapacitors

Author: DengGuoHong
Tutor: ChenJinHua
School: Hunan University
Course: Applied Chemistry
Keywords: Electrochemical capacitors Carbon nanotubes Oxidation nails CVD Composite electrode
CLC: TM535
Type: Master's thesis
Year: 2005
Downloads: 277
Quote: 2
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Abstract


Electrochemical Supercapacitors (ECs) as a new energy storage device, due to its large capacitance, high energy density, high power density, high charge-discharge efficiency, requires no maintenance and maintenance, long cycle life, excellent performance in recent years electrical back-up power and hybrid cars attracted widespread attention and rapid development. In the ultra-capacitor electrode is the core, the pros and cons of the performance and cost is directly related to the application and industrialization of the ultra-capacitor energy density and cost and ultra-capacitors. Currently, ruthenium oxide for its excellent performance in capacitance can not be compared with other substances and attracted much attention. But as ruthenium oxide expensive, so that large-scale application is limited. On the other hand, carbon nanotubes because of their excellent electrical properties, high specific surface area characteristics, has been widely used as a catalyst carrier material and the electric double layer capacitor electrode material. However, the specific capacitance of pure carbon nanotubes is relatively low. This paper combines the advantages of the ruthenium oxide and carbon nanotubes, using different methods to prepare three different ruthenium oxide / carbon nanotube composite electrode electrochemical supercapacitors performance in sulfuric acid solution was studied. Main work of the following aspects: 1. Three different electrodes prepared by different methods: (a) by cyclic voltammetry in disordered carbon nanotubes deposited on the surface of ruthenium oxide obtained the RuO x · nH 2 O / CNTs / G (G is the graphite sheet) composite electrode (electrode I); (b) using \process directly prepared the the RuO 2 · xH O / CNTs / G composite electrode (electrode II); (c) the growth of highly ordered carbon nanotube electrodes directly in the graphite matrix on cyclic voltammetry deposition of ruthenium oxide obtained the RuO x · NH 2 O / ACNTs / the the G composite electrode (electrode III). 2 by the results of surface analysis of the composite electrode scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the electrodes are prepared having a three-dimensional structure of ruthenium oxide is highly dispersed in the carbon nanotube surface. By the pulse deposition the RuO prepared 2 · xH 2 O / CNTs / G composite electrode of ruthenium oxide is not only distributed in the three-dimensional structure of the surface of the electrode, but also in the highly fragmented internal wall carbon nanotubes on the electrode, the carbon tube super capacitor performance has been greatly improved. Ordered carbon nanotubes prepared the RuO x · NH 2 O / ACNTs / G composite electrode SEM inspection showed that, after the deposition of ruthenium oxide and orderly carbon nanotubes surface are covered ruthenium oxide composite electrode orientation and structure of disordered carbon nanotubes composite electrode can not match the three-dimensional array. The prepared three electrodes in sulfuric acid system reflects the good electrochemical supercapacitors characteristics. Studies have shown that the composite electrode I the RuO 2 of load to 15.5 μg / cm 2 , the specific capacitance of 215 F / g, is similar to the loading amount under the same conditions on the graphite substrate prepared the RuO x · NH 2 O / G electrode is 2.4 times the power characteristics of the electrode than the RuO x · nH 2 O / G electrode is superior. RuO 2 · xH 2 O / CNTs / G composite electrode (electrode II) has a good electrochemical reversibility, charge and discharge the study found, in RuO 2 and the mass accounted for only 6 wt%, the composite electrode for the specific capacitance of up to 157 F / g is pure carbon nanotube electrodes 6 times, and

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CLC: > Industrial Technology > Electrotechnical > Electrical > Capacitor > Electrolytic capacitor
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