壳聚糖衍生多孔炭的制备及其电容特性研究

Chitosan-derived Carbon Materials with Enriched Pores and Enhanced Capacitive Performance

为了实现兼具廉价、环保和结构可控等优点的多孔炭的制备,以Zn-BTC(均苯三甲酸)为软模板,通过高温热解获得了一种富含微孔-介孔的壳聚糖衍生碳材料。通过SEM、TEM、XRD、N_(2)吸脱附、Raman光谱等系统表征了材料的微观结构,通过恒流充放电和交流阻抗分析了材料的电化学特性,考察了Zn-BTC的添加量、热解温度对衍生碳结构及电容行为的影响。研究结果表明,材料由超薄片层构成,呈分级多孔结构,比表面积高达612 cm^(2)·g^(-1)。与壳聚糖直接衍生碳相比,其比电容提高近3倍,器件在3万次循环充放电后的比电容保留率为100%。

For the low-cost,environmental and structure-controllable preparation of porous carbon materials,taking Zn-BTC(Zn-benzotricarboxylic acid complex)as a soft template,a chitosan-derived porous carbon material was obtained by the facile pyrolysis of Chitosan-Zn-BTC sol.The fine structure of as-prepared material was systematically characterized by SEM,TEM,XRD,N_(2)adsorption/desorption test,Raman spectroscopy,etc.and their electrochemical properties were mainly analyzed by galvanostatic charge-discharge(GCD)and electrochemical impedance spectroscopy.The effects of Zn-BTC addition amount and the pyrolysis temperature on the structure and capacitive behavior of as-derived carbon were investigated.The material was featured by ultra-thin layer assembled porous structure that has large specific surface area of 612 cm^(2)g^(-1).The specific capacitance was increased by nearly 3 times as compared with that of the carbon directly carbonized from chitosan;as-assembled symmetrical supercapacitor displayed 100%capacitance retention after 30000 GCD cycles.