化工学报 ›› 2023, Vol. 74 ›› Issue (3): 1379-1389.DOI: 10.11949/0438-1157.20221497

• 材料化学工程与纳米技术 • 上一篇    下一篇

聚苯胺/二氧化锰/聚吡咯复合纳米球的制备及其电化学储能性

徐东1(), 田杜1, 陈龙1, 张禹1, 尤庆亮1, 胡成龙1(), 陈韶云1(), 陈建2   

  1. 1.江汉大学光电材料与技术学院,光电化学材料与器件教育部重点实验室,湖北 武汉 430056
    2.中山大学测试中心,广东 广州 510275
  • 收稿日期:2022-11-17 修回日期:2023-01-29 出版日期:2023-03-05 发布日期:2023-04-19
  • 通讯作者: 胡成龙,陈韶云
  • 作者简介:徐东(1998—),男,硕士研究生,2682552123@qq.com
  • 基金资助:
    国家自然科学基金项目(51973244)

Preparation and electrochemical energy storage of polyaniline/manganese dioxide/polypyrrole composite nanospheres

Dong XU1(), Du TIAN1, Long CHEN1, Yu ZHANG1, Qingliang YOU1, Chenglong HU1(), Shaoyun CHEN1(), Jian CHEN2   

  1. 1.Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Optoelectronic Materials & Technology, Jianghan University, Wuhan 430056, Hubei, China
    2.Instrumental Analysis and Research Center, Sun Yat-sen University, Guangzhou 510275, Guangdong, China
  • Received:2022-11-17 Revised:2023-01-29 Online:2023-03-05 Published:2023-04-19
  • Contact: Chenglong HU, Shaoyun CHEN

摘要:

利用化学合成法成功制备了尺寸分布均一的聚吡咯(polypyrrole,PPy)纳米球,通过酸解法将KMnO4分解成MnO2纳米片原位生长在PPy纳米球表面,然后采用稀溶液合成法将聚苯胺(polyaniline,PANI)生长在MnO2表面,得到PANI@MnO2@PPy三元复合材料。扫描电子显微镜、透射电镜、拉曼光谱、X射线粉末衍射和X射线光电子能谱证实PANI@MnO2@PPy成功合成。通过溶液涂覆法,将PANI@MnO2@PPy三元复合材料制备成电极并测定其电化学储能性,在1 mol·L-1 Na2SO4电解质溶液中,当电流密度为0.5 A·g-1时,PANI@MnO2@PPy电极的比电容量约为357 F·g-1,是MnO2@PPy电极的1.96倍;当电流密度从0.5 A·g-1增加到5.0 A·g-1时,PANI@MnO2@PPy电极的电容损失率为26.9%,说明复合体系具有良好的倍率性能;当电流密度为10.0 A·g-1时,PPy、MnO2@PPy和PANI@MnO2@PPy电极经过1000次的循环恒电流充放电后电容保持率分别为45%、70%和76%,其中PANI@MnO2@PPy电极电容保持率最高,说明PPy、PANI 和MnO2三者的协同作用,能有效提高三元复合体系的长寿命循环稳定性。

关键词: 聚合物, 复合材料, 纳米结构, 电极材料, 超级电容器

Abstract:

Polypyrrole (PPy) nanospheres with uniform size distribution were successfully prepared by chemical synthesis, and then KMnO4 was decomposed into MnO2 by acid hydrolysis. Finally, the polyaniline (PANI) in-situ grew on the surface of MnO2 by dilute solution synthesis to form PANI@MnO2@PPy ternary composite. Scanning electron microscope, transmission electron microscope, Raman spectroscopy, X-ray powder diffraction and X-ray photoelectron spectroscopy confirmed that the PANI@MnO2@PPy was successfully synthesized. The PANI@MnO2@PPy ternary composite was prepared as electrode by solution coating and its electrochemical energy storage capacity was measured in 1 mol·L-1 Na2SO4 electrolyte solution. The specific capacitance of PANI@MnO2@PPy electrode was about 357 F·g-1 at a current density of 0.5 A·g-1, which was 1.96 times compare to the MnO2@PPy electrode. The capacitance loss of PANI@MnO2@PPy electrode was 26.9% when the current density increased from 0.5 A·g-1 to 5.0 A·g-1, indicating it had good rate capability. When the current density was 10.0 A·g-1, the capacitance retention rate of PPy, MnO2@PPy and PANI@MnO2@PPy electrodes were 45%, 70% and 76% respectively, after 1000 cycles of constant current charge and discharge, which showed that the chemical modification of PPy through PANI and MnO2 could effectively improve the long-life cycle stability of PANI@MnO2@PPy.

Key words: polymers, composites, nanostructure, electrode materials, supercapacitor

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