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Study on Preparation of Carbon@Metal Oxide Composite Materials and Their Electrochemical Properties

Author: ChenJingXing
Tutor: YuanDingSheng
School: Jinan University
Course: Inorganic Chemistry
Keywords: Metal-organic coordination polymers Mesoporous Carbon Oxide Specific surface area Capacitance Supercapacitor
CLC: TB333
Type: Master's thesis
Year: 2010
Downloads: 194
Quote: 0
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Abstract


This paper aims to explore the use of cheap raw materials and simple synthesis techniques, preparation of high specific capacitance of mesoporous carbon materials, mesoporous metal oxide materials, and carbon / metal oxide composite materials for supercapacitor electrode materials, and synthetic materials The structure and performance analysis and characterization. Can be summarized as follows: (1) a metal organic coordination polymers (MOCP) for the carbon precursor, glycerol as additive directly synthesized by high temperature calcination has a bimodal pore size distribution of the worm-like mesoporous carbon. With X-ray diffraction analyzer, and the specific surface area analyzer, of different polymers and additives may be added after the precursor of the final pore mesoporous carbon materials structure and microcrystalline structures; using cyclic voltammetry, constant current charge and discharge, and Electrochemical impedance characterization method is prepared under different conditions of the electrochemical properties of mesoporous carbon materials. The experimental results showed that: carbon precursor by adding an appropriate amount of bismuth nitrate, to effectively improve the specific surface area mesoporous carbon material at the same time, focus on the preparation of the pore size distribution of about 2.6nm and 6.3nm bimodal distribution of the worm-like mesoporous carbon material, Maximum surface area of ??up to 2857m2 / g; in 6mol / L KOH aqueous solution, the current density of 50mA / g, the specific capacitance of a single electrode carbon material up to 344F / g. (2) bismuth nitrate as the raw material solution, NaOH solution as the precipitant, polyethylene glycol (PEG-400) as surfactant, the use of Direct hydrothermal synthesis of Bi2O3 electrode material. And its structure, morphology and electrochemical properties were analyzed. The results show that the hydrothermal synthesis of Bi2O3 electrode material for the rod-like structure, and morphology of uniform. XRD diffraction analysis revealed that the electrode material is α-phase. Cyclic voltammetry and galvanostatic charge-discharge cycle life test results show that the electrode material has excellent performance and high current ultra-capacitor charge and discharge performance, 100mA / g than the current conditions single electrode capacitance up to 1333F / g; 5A / g discharge current conditions specific capacitance after 600 cycles is still as high 720F / g. (3) to the worm-like mesoporous carbon material as a carrier, respectively, of different concentrations of bismuth nitrate and manganese nitrate solution impregnation solution adsorption method using microwave radiation using microwave energy short-prepared mesoporous carbon / Bi2O3, mesoporous carbon / Mn3O4 composite electrode material. Through the structure and morphology of the composites were characterized, and their electrochemical properties for detailed analysis. The results showed that short-term high-energy radiation in the microwave worm-like mesoporous carbon load on Bi2O3, Mn3O4 more uniform particle dispersion, particle size between 30 ~ 200nm, which will help the electrolyte through the mesoporous oxide in contact with carbon Kongdao Shun Lee in process to fully discharge redox reactions occur, so that the composite material can provide both the electric double layer capacitors and pseudo capacitors, and thus significantly improve the performance of a capacitor electrode material.

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