Synthesis and Applications of Mesoporous Carbon/Silica Composite

• Main Authors: Wei-Che Tsao, 曹瑋哲
• Other Authors: Hong-Ping Ling
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/65562263891442071608

碩士 === 國立成功大學 === 化學系碩博士班 === 97 === This research uses different composing ways to synthesize Mesoporous carbon/Silica composite material as selective solar-absorber materials, and we use Nitrogen adsorption/desorption isothermal measurements and Thermogravimetric Analyzer –TGA to obtain the specimen’s data of carbon specific surface and its carbon content. Comparing with the rising-temperature data of the experiment which is illuminated by sunlight, we can know the former’s radiation absorptive capacity. This composing way makes use of PF resin, Polymer surfactants, and Sodium silicate and let them homogeneous mixing within highly alkaline solution (pH>11), and acidifies by vitriol solution to adjust gel solution‘s PH value from 4.0 to 6.0. It’s also via pyrolysis to generate Mesoporous carbon and Silica composite material with high Carbon specific surface (900~1900 m2g-1) and high Carbon content(25~33%). On the other hand, Silica template is the composing way of using polymer surfactants’ micelle within the certain concentration. This way can synthesize out the controllable-diametered (100 nm~2 um) Mesoporous carbon/silica composite material whose radiation absorptive capacity illuminated by sunlight is better than Bamboo Charcoal and Active carbon XC-72. Moreover, we attempt to combine nano cuprous oxide with Mesoporous carbon/silica composite material for increasing the composite’s heat conduction capacity, and also use different ways of controlling heat treatment to generate the metal nano-composites in varied oxidation state. As a result, there are some composing ways of synthesizing nano cuprous oxide into silica and carbon or carbon and silica support. Finally, we use Surface-active agent P123 and Sodium Silicate to synthesize Mesoporous carbon/silica composite material on the surface of Mesophase graphite powder (MGP).The anode materials in different MGP measurement experiment by coin cell charge/discharge test and cycle life test for analyzing their traits of cell charge/discharge and cycle life. As a result, the more MGP we increase, there is much capacitance. Besides, it can reach to the optimum condition. When doing experiment in optimum condition, we can increase MGP capacitance from 320 mAh/g to 420 mAh/g. In conclusion, the anode materials still maintain in constant capacitance after 0.1 C fifty cell charge/discharge cycles.