凹凸棒NaY分子筛模板炭材料的制备及其电化学性能研究

Preparation and Electrochemical Performance of Carbon Materials by Using NaY Molecular Sieves as the Template

以凹凸棒为原料,采用水热原位晶化法合成了NaY分子筛,然后采用模板法以制备得到的纳米级NaY分子筛为模板,麦芽糖为碳源,制备得到一种微孔模板炭材料。采用XRD、FESEM、N2吸附/脱附等手段对NaY分子筛和微孔模板炭材料的物理性能进行表征。测试结果表明,NaY分子筛的粒径小于100 nm,比表面积为487 m2/g;模板炭材料的比表面积为789.2 m2/g、总孔容为0.62 m3/g,平均孔径为1.5 nm。随后,采用恒电流充放电测试、循环伏安测试对模板炭材料的电化学性能进行测试。恒电流充放电测试表明,当电流密度为600 m A/g时,材料的比电容可达163.3 F/g,循环伏安测试中材料表现出了良好的循环伏安曲线的矩形特征,较好的说明了材料具有良好的倍率性能。

Using attapulgite as raw materials, nano-scale NaY molecular sieves were synthesized by in-situ crystallization method. Then porous carbon materials were synthesized by using the NaY molecular sieves as hard template and maltose as carbon precursor. XRD, FESEM, N2 adsorption/desorption tests were conducted to investigate physical properties of NaY molecular sieves and porous carbon materials. The results show that the size of NaY molecular sieves is less than 100nm and BET area is 487 m^2/g; specific surface area and pore volume of the porous carbon materials reach up to 789.2 m^2/g, 0.62 cm^3/g, respectively. The constant current charge/discharge tests and cyclic voltammetry tests were employed to investigate the electrochemical performance of the prepared porous carbon material. When the current density is 600 mA/g, the maximum specific capacitance of the material is 163.3 F/g. The cyclic voltammetry curves maintain a typical quasi-rectangular feature when the scan rate increases from 5 mV/s to 100 mV/s, which proves that the material has well rate performance.