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林产化学与工业 ›› 2020, Vol. 40 ›› Issue (6): 61-69.doi: 10.3969/j.issn.0253-2417.2020.06.008

• 研究报告 • 上一篇    下一篇

聚吡咯@二氧化锰@剑麻微晶纤维素柔性超级电容器的制备及其电化学性能研究

梁春柳1, 臧利敏1,*(), 刘鑫1, 左武升1, 刘启凡2   

  1. 1. 桂林理工大学 材料科学与工程学院; 有色金属及材料加工新技术教育部重点实验室, 广西 桂林 541004
    2. 秋田县立大学 系统科学学部, 日本 秋田 015-0055
  • 收稿日期:2020-06-18 出版日期:2020-12-28 发布日期:2020-12-29
  • 通讯作者: 臧利敏 E-mail:zanglimin0705@163.com
  • 作者简介:臧利敏, 女(壮族), 副研究员, 硕士生导师, 主要从事柔性储能材料和可穿戴储能器件的研究; E-mail:zanglimin0705@163.com
    梁春柳(1994-), 女(壮族), 广西河池人, 硕士生, 主要从事纤维素基复合材料的研究工作
  • 基金资助:
    广西自然科学基金资助项目(2019GXNSFAA245028);广西自然科学基金资助项目(2017GXNSFBA198085)

Preparation and Properties of Flexible Supercapacitor from Polypyrrole@Manganese Dioxide@Sisal Microcrystalline Cellulose

Chunliu LIANG1, Limin ZANG1,*(), Xin LIU1, Wusheng ZUO1, Qifan LIU2   

  1. 1. MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Collegeof Material Science and Engineering, Guilin University of technology, Guangxi 541004, China
    2. Department of Machine Intelligence and Systems Engineering, Faculty of Systems Science and Technology, Akita Prefectural University, Yurihonjo 015-0055, Japan
  • Received:2020-06-18 Online:2020-12-28 Published:2020-12-29
  • Contact: Limin ZANG E-mail:zanglimin0705@163.com

摘要:

以剑麻废屑制备得到的剑麻微晶纤维素(SMC)为柔性基体,先在其表面化学沉积MnO2,再将吡咯(Py)单体原位聚合得到PPy@MnO2@SMC复合电极材料。探讨了MnO2沉积时间(10、20、30 min)对电极材料性能的影响,并将材料用于组装超级电容器。通过场发射扫描电子显微镜(SEM)和X射线衍射(XRD)对电极材料进行表征,并采用循环伏安(CV)、恒流充放电(GCD)、交流阻抗(EIS)等方法分析了材料的电化学性能。研究结果表明:通过化学沉积后MnO2纳米片成功包覆在SMC表面,经过原位聚合后无定形的PPy成功包覆在MnO2@SMC表面;MnO2沉积时间为20 min时得到的PPy@MnO2@SMC-2电极的电化学性能最佳,在0.25 A/g电流密度下,比电容高达474.3 F/g。将PPy@MnO2@SMC-2电极组装成电容器,该电容器在0.25 A/g电流密度下比电容为81.6 F/g,最大能量密度和功率密度分别为7.3 W·h/kg和475.7 W/kg;经过折弯测试,表现出良好的柔性;通过5 000次循环充放电后电容保持率达99.5%,表现出优异的循环稳定性能;通过相应的串并联和点灯演示,展现了其实际应用价值。

关键词: 剑麻纤维素, 二氧化锰, 聚吡咯, 柔性电极

Abstract:

Sisal microcrystalline cellulose(SMC) prepared from sisal wastes was used as flexible substrate and the manganese dioxide(MnO2) was deposited on its surface by chemical deposition. Then, the pyrrole monomers were in situ polymerized to obtain the PPy@MnO2@SMC composite electrodes. The effects of deposition time of MnO2(10, 20 and 30 min) on the performance of composite electrodes were investigated, and the composite electrodes were used to assemble supercapacitors. The composite electrodes were characterized by field emission scanning electron microscopy(SEM) and X-ray diffraction(XRD), and the electrochemical properties were analyzed by cyclic voltammetry(CV), galvanostatic charge-discharge(GCD) and electrochemical impedance spectroscopy(EIS). The SEM and XRD results indicated that the MnO2 nanosheets were successfully coated on the surface of SMC by chemical depositionand and PPy with amorphous structure was successfully coated on the surface of MnO2@SMC by in situ polymerization. The electrochemical test results showed that when the deposition time of MnO2 was 20 min the as-prepared PPy@MnO2@SMC-2 composite electrode exhibited the best electrochemical performance. At the current density of 0.25 A/g, its specific capacitance was up to 474.3 F/g. The supercapacitor based on PPy@MnO2@SMC-2 composite electrode had high specific capacitance of 81.6 F/g at current density of 0.25 A/g, and its maximum energy density and power density were 7.3 Wh/kg and 475.7 W/kg, respectively.The supercapacitor showed good flexibility which was proved by the bending test and kept 99.5% of its initial capacitance after 5 000 charge-discharge cycles which indicated its excellent cycle stability. Besides, the corresponding performances about the series and parallel connection and an example of lighting up a lamp demonstrated that the supercapacitor could be applied in practical application.

Key words: sisal cellulose, manganese dioxide, polypyrrole, flexible electrodes

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