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Preparation and Capacitance Performance of Carbon-Encapsulated Metal Oxides as Electrode for Supercapacitor

Author: SongJia
Tutor: SongHuaiHe
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: Carbon-coated nano metal oxide Electrode material Hollow structure Hydrothermal oxidation Supercapacitor
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 146
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Abstract


With the emergence of growing energy consumption and global warming and other environmental problems, people increasingly urgent demand for greenhouse gas emissions controlled new clean energy and advanced energy storage devices. Supercapacitor as a new kind of green, environmentally friendly energy storage devices came into being, high energy density, high power density, long life and other characteristics, with a very wide range of applications. Supercapacitor performance of high-power, high specific capacity of the electrode material development has important practical and theoretical value. New type of electrode material, coated with carbon nano-metal composite oxide as a metal oxide and carbon has the advantages of both the high power performance of the carbon material and a metal oxide of high specific capacity, making it the most of the electrode materials for supercapacitor best to select one. Carbon-coated nano metal particles (Carbon-encapsulated metal nanoparticles, CEMNP) precursor, the use of these two methods of direct oxidation and hydrothermal oxidation to prepare carbon-coated nano metal oxide particles, carbon-coated electrochemical properties of nano metal oxide particles as a supercapacitor electrode materials. Respectively, using scanning electron microscopy, transmission electron microscopy, high resolution transmission electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy for the external appearance and internal structure of the product, and the mass concentration of 30% KOH electrolyte , use of charge-discharge cycles, cyclic voltammetry and AC impedance means testing the electrochemical performance as supercapacitor electrode material. The study showed that using the carbon-coated nano-particle size of the nickel oxide particles (NiO @ C), prepared by direct oxidation method under the 300 ° C temperature transition at 10 to 20 nm. , Depending on the oxidation time, the oxidation of 10 hours the reaction product with the highest electrochemical performance in the current density of 0.1 A / g, the capacity can be achieved than 193 the F / g, and good power performance. Prepared by the direct oxidation method under a high temperature of 270 ℃ coated with carbon nano-cobalt oxide particles (Co3O4 @ C), particle diameter of 30-40 nm, while a certain amount of hollow structure of Co3O4 @ C particles generated the (sized Co3O4 _AT_ C-HNPs). Wherein the oxidation time is 24 h samples of the best electrochemical performance, capacity can be achieved than in the current density of 0.1 A / g, 108F / g, and has a good power performance. Hydrothermal oxidation of this article to explore the new method of preparation of carbon-coated nano metal oxide particles, carbon-coated nano metal particles as precursor of 30% H202 as an oxidizing agent, in the high-pressure water autoclave, 200 ° C the reaction time. Carbon coated nickel nano metal oxide particles prepared in this way, there has been a certain amount of hollow structure. Wherein Preferably, the performance of the electrochemical oxidation of 15 hours, than the capacity at a current density of 0.1 A / g up to 966 F / g, still 402 F / g, even at a high current density 2 A / g, showed excellent capacitance Performance. The results show that: Hydrothermal Synthesis of carbon-coated nano-the metal nickel oxide electrochemical performance is far superior to the direct oxidation of the samples prepared. The reason is because this method generates a large number of hollow structures for the oxidation-reduction reaction of the nickel oxide providing more reactive sites, while the surface of the carbon-coated layer is oxidized to form a functional group also contributed pseudocapacitive.

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