碳纳米管电极压片成型条件优化与脱盐性能研究

以碳纳米管（CNT）为活性材料,聚偏氟乙烯（PVDF）为黏结剂,石墨（G）为导电剂,采用压片成型法制作用于电容法脱盐（CDI）过程的电极。研究分析了黏结剂比例和成型压力等制作条件对电极电化学性能和脱盐性能的影响规律。结果表明：随着黏结剂比例的增加,电极的比表面积和电导率均呈逐渐降低趋势,而电极比电容和比吸附量则呈先增加后减小的变化规律;随着成型压力的增加,电极的比表面积逐渐减小,导电率逐渐增大,比电容与比吸附量呈先增加后减小的趋势。在PVDF的质量分数为10%、G的质量分数为5%、成型压力为10 MPa的条件下,制作得到的电极性能最好,其比电容和比吸附量分别为80.4 F/g和14.1 mg/g。

Modeling Condition Optimization and Desalting Performance Evaluation of Carbon Nanotubes Electrode

With carbon nanotubes as active materials,polyvinylidene fluoride（PVDF） as adhesive and graphite as conductive material,electrodes for CDI process were fabricated through compression moulding method.Effect of the fabrication conditions-adhesive proportion and moulding pressure on the electrode electrochemical performance and desalination were studied and analyzed.The results show that,with the increase of the adhesive proportion,the specific surface area and conductivity of the electrodes are tending to gradually reduce,while the specific capacitance and the specific adsorption of the electrode increase initially and decrease afterwards.Along with the increase of molding pressure,the electrode specific surface area decreases gradually,however,its conductivity increases accordingly.The electrode specific capacitance and the specific adsorption increase at the first and then decrease as the pressure rising.When the PVDF weight content is 10%,the graphite content is 5% and the molding pressure is 10 MPa,the electrode has the best performance with the electrode specific capacitance of 80.4 F/g and the specific adsorption of 14.1 mg/g.