碳纳米管浓度对CNT@BC纳米复合膜的理化及电化学性能的影响

Effect of CNT Concentration on the Physical and Electrochemical Properties of CNT@BC Nanocomposite Film

为了使细菌纤维素(BC)具有一定的导电性能,采用静态原位培养法,将BC与碳纳米管(CNT)原位培养,得到具有导电性能的CNT@BC纳米复合膜。通过对0.05%(w/V)、0.15%(w/V)和0.25%(w/V)不同浓度CNT培养的CNT@BC复合膜的形貌、匀度与厚度、力学性能、红外、孔径及比表面积、热重、CV、LSV、EIS表征,探究CNT浓度对CNT@BC纳米复合膜的理化及电化学性能的影响。结果表明,CNT的加入对BC膜的杨氏模量有增强作用,CNT浓度越大则复合膜力学性能越强;CNT提高了BC膜的热稳定性,且随着CNT浓度的增加,复合膜的热稳定性越高;加入CNT后,复合膜的孔径增大,比表面积降低。电化学分析可知CNT增加了复合膜的电导率,并且电导率随着CNT浓度的增大而增大,其中0.15%CNT@BC复合膜的电流密度最大(4.17 mA/cm2)、起峰电位最早(-0.02 VRHE),这说明0.15%CNT@BC复合膜具有优异的电化学性能,在电化学领域具有良好的应用前景。

In order to make bacterial cellulose(BC)have a certain electrical conductivity,BC and carbon nanotubes(CNT)were in situ cultivated by using static culture method to obtain CNT@BC nanocomposite films.The morphology,uniformity and thickness,mechanical properties,infrared spectra,pore size and specific surface area,thermogravimetric,CV,LSV and EIS of the CNT@BC composite films obtained by using the culture media containing different CNT concentrations of 0.05%(w/V),0.15%(w/V)and 0.25%(w/V)were characterized,and the effects of CNT concentration on the physicochemical and electrochemical properties of the CNT@BC nanocomposite films were investigated.The addition of CNT enhanced the Young's modulus of BC film.And the higher the concentration of CNT,the stronger the mechanical properties of the composite films were.The thermal stability of BC film was improved by addition of CNT,and with the increase of CNT concentration,the thermal stability of the composite film was higher.The addition of CNT increased the pore diameter and specific surface area of the composite films.Electrochemical analysis showed that the conductivity of the composite films increased with the increase of the CNT concentration,among which the 0.15%CNT@BC composite film had the highest current density(4.17 mA/cm2)and the earliest peak potential(-0.02 VRHE),indicating that the 0.15%CNT@BC composite film had excellent electrochemical performance and had a good application prospect in the electrochemical field.