Lyu Shaoyi, Chen Yanping, Zhang Longfei, Han Shenjie, Lu Yun, Chen Yuan, Yang Na, Chen Zhilin, Wang Siqun
Research Institute of Wood Industry, Chinese Academy of Forestry, Hunan Collaborative Innovation Center for Effective Utilizing of Wood & Bamboo Resources Beijing 100091 China
Beijing Engineering Research Center of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology Beijing 100081 China.
RSC Adv. 2019 Jun 6;9(31):17824-17834. doi: 10.1039/c9ra02449b. eCollection 2019 Jun 4.
The development of a hierarchical structured multicomponent nanocomposite electrode is a promising strategy for utilizing the high efficiency of an electroactive material and improving the electrochemical performance. We propose cellulose nanofibril (CNF) aerogels with a nanoscale fiber-entangled network as the skeleton ( layer-by-layer (LbL) assembly) of electroactive materials polyaniline (PANi), carboxylic multiwalled carbon nanotubes (CMWCNTs), and graphene oxide (GO) to obtain structurally ordered polymer-inorganic hybrid nanocomposite electrodes for high-capacity flexible supercapacitors. The uniformly distributed multilayer nanoarchitecture, interconnected network, and hydrophilicity of the electrode provide a high specific surface area, excellent ion diffusion channels, and large effective contact area, thereby improving the electrochemical performance of the supercapacitor electrode. The specific capacitance of the CNF-[PANi/CMWCNT] (CPC) and CNF-[PANi/RGO] (CPR) electrodes reaches 965.80 and 780.64 F g in 1 M aqueous HSO electrolyte, respectively; the corresponding values in PVA/HPO electrolyte are 1.59 and 1.46 F cm. In addition, the assembled symmetric supercapacitors show good energy densities of 147.23 and 112.32 mW h cm, as well as excellent durability and flexibility. Our approach offers a simple and effective method for fabricating an ideal well-structured nanocomposite electrode for green and flexible energy storage devices LbL assembly.
开发具有分层结构的多组分纳米复合电极是一种利用电活性材料的高效率并改善电化学性能的有前景的策略。我们提出以具有纳米级纤维缠结网络的纤维素纳米纤维（CNF）气凝胶作为电活性材料聚苯胺（PANi）、羧基多壁碳纳米管（CMWCNT）和氧化石墨烯（GO）的骨架（逐层（LbL）组装），以获得用于高容量柔性超级电容器的结构有序的聚合物-无机杂化纳米复合电极。电极的均匀分布的多层纳米结构、互连网络和亲水性提供了高比表面积、优异的离子扩散通道和大的有效接触面积，从而改善了超级电容器电极的电化学性能。CNF-[PANi/CMWCNT]（CPC）和CNF-[PANi/RGO]（CPR）电极在1 M 水性HSO电解质中的比电容分别达到965.80和780.64 F g；在PVA/HPO电解质中的相应值分别为1.59和1.46 F cm。此外，组装的对称超级电容器显示出良好的能量密度，分别为147.23和112.32 mW h cm，以及优异的耐久性和柔韧性。我们的方法为制造用于绿色和柔性储能装置的理想结构良好的纳米复合电极提供了一种简单有效的方法——逐层组装。
