Department of Materials Science and Engineering, McMaster University, Hamilton, ON L8S 4L7, Canada.
Molecules. 2022 Mar 3;27(5):1659. doi: 10.3390/molecules27051659.
The high theoretical capacitance of MnO renders it a promising material for the cathodes of asymmetric supercapacitors. The good dispersion of MnO and conductive additives in a nanocomposite electrode is a key factor for efficient electrode performance. This article describes, for the first time, the application of rhamnolipids (RL) as efficient natural biosurfactants for the fabrication of nanocomposite MnO-carbon nanotube electrodes for supercapacitors. RL act as co-dispersants for MnO and carbon nanotubes and facilitate their efficient mixing, which allows for advanced capacitive properties at an active mass of 40 mg cm in NaSO electrolytes. The highest capacitance obtained from the cyclic voltammetry data at a scan rate of 2 mV s is 8.10 F cm (202.6 F g). The highest capacitance obtained from the galvanostatic charge-discharge data at a current density of 3 mA cm is 8.65 F cm (216.16 F g). The obtained capacitances are higher than the capacitances of MnO-based electrodes of the same active mass reported in the literature. The approach developed in this investigation is simple compared to other techniques used for the fabrication of electrodes with high active mass. It offers advantages of using a biocompatible RL biosurfactant.
MnO 的理论比电容高，使其成为制造非对称超级电容器阴极的有前途的材料。纳米复合电极中 MnO 和导电添加剂的良好分散是实现高效电极性能的关键因素。本文首次描述了鼠李糖脂（RL）作为高效天然生物表面活性剂在超级电容器用纳米复合 MnO-碳纳米管电极中的应用。RL 作为 MnO 和碳纳米管的共分散剂，促进其有效混合，从而在 NaSO 电解质中在 40mgcm 的活性质量下实现先进的电容性能。在扫描速率为 2mV s 时，从循环伏安数据中获得的最高电容为 8.10Fcm（202.6Fg）。在电流密度为 3mAcm 时，从恒流充放电数据中获得的最高电容为 8.65Fcm（216.16Fg）。所获得的电容高于文献中报道的相同活性质量的基于 MnO 的电极的电容。与用于制造具有高活性质量的电极的其他技术相比，本研究中开发的方法更为简单。它具有使用生物相容性 RL 生物表面活性剂的优势。
