含氮活性炭作为超级电容器电极材料的研究化学工程与技术专业论文.docxVIP

内蒙古 内蒙古工业大学硕士学位论文 内蒙古 内蒙古工业大学硕士学位论文 作为超级电容器电极材料，比较头发基天然富氮活性炭和化学试剂富氮活性炭的 电化学性能。 关键词：头发；富氮；氧化还原；活性炭；超级电容器 Abstract Supercapacitors, also called electrochemical capacitors or ultracapacitors, have elicited much interest in the last decade because they have higher power density than batteries as well as higher energy density than conventional dielectric capacitorsThe capacitance and charge storage of supercapacitors depend on the materials utilized as supercapacitor electrodes. Thus, much effort has been exerted to discover ideal materials for supercapacitor electrodes. Activated carbon materials are the most studied materials for electrical double-layer capacitors (EDLCs) because of their advantages such as highly developed specific surface area, possibility of tailoring pore sizes for specific ions, excellent chemical stability, and environment friendly. Researchers have exerted much effort to manufacture carbon electrode materials with high specific capacitance for supercapacitors. Introducing electronic conductivity or pseudo-capacitance by doping nitrogen-containing groups in the carbon matrix is a more promising alternative compared with enhancing the specific surface area. Nitrogen-doped porous carbon is prepared by two methods. The first method is by treating porous carbons with chemical agents. The second method is by in situ doping using precursors with abundant nitrogen, which can facilitate the uniform incorporation of nitrogen into the carbon material with a controlled chemistry. Based on this analysis, in order to improve the energy density of the porous carbon eleetrode，firstly, the preparation of nitrogen-doped porous carbons with biomass waste via simple, environmental, and energy-saving technical methods is an effective process for the production of high performance and low cost nature-rich activated carbons. Seeondly, the commercial activated carbon, was modified by surface treatment with ammonia and urea in order to improve the electrochemical perfor