Polypyrrole/Reduced Graphene Oxide Nanocomposite as Supercapacitor Electrode-Effects of Preparation Procedures and Doping Effect

• Main Authors: WU, YI-LIN, 吳一霖
• Other Authors: LIN, CHI-WEN
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/7cd8qn

碩士 === 國立雲林科技大學 === 化學工程與材料工程系 === 106 === The ain of this study is to investigate the effects of dopants and different preparation procedures for the preparation of polypyrrole(PPy)/reduced graphene oxide(RGO) nanocomposite electrode materials applied on the impact of supercapacitor electrode. Firstly, different groups of PPy are prepared by different (dopant types), and PPy-Dopant with better performance is selected, and then PPy-Dopant with different concentration ratios is synthesizes by different (oxidant concentration, dopant concentration). The best electrochemical performance of PPy-Dopant was selected. Finally, two groups of different dopants and different material concentration ratios of PPy were synthesized, which were PPy-DBSA and PPy-CTAB. During the experiment, it was found that the chemical in-situ polymerization of PPy and PPy/GO composite materials, the order of addition of dopants and pyrrole monomers, had a significant effect on the integrity after polymerization, by cyclic voltammetry ( CV) shows that the electrochemical active areas of PPy (CTAB), PPy (DBSA) and PPy (CTAB) 7GO3, PPy (DBSA) 7GO3 in two different processes are significantly different, and the electrochemical area is compared with each other. The order of adding the pyrrole after the dopant is greater than the order of adding the pyrrole and then adding the dopant. Because GO has poor conductivity and the electrochemical active area of RGO is larger than GO, PPy/GO is further prepared into PPy/RGO. There are three ways to process respectively: two-step synthesis (polymerization of PPy/GO, then reduction to PPy/RGO), two-step synthesis(reduction of RGO, then polymerization to PPy/RGO), one-step synthesis (simultaneous polymerization and PPy(DBSA)7RGO3 prepared by the preparation methods showd that the electrochemical activity area of PPy(DBSA)7RGO3 was larger than that of PPy(CTAB)7RGO3 prepared by three processes. The result proves that DBSA is The best dopant is used to prepare PPy7RGO3. It is known that DBSA is the best dopant for the preparation of PPy7RGO3, and PPy(DBSA)7RGO3 prepared by one-step synthesis (simultaneous polymerization and reduction) has the highest specific capacitance value 574 F/g at a scan rate of 5 mV/s, and PPy(DBSA)7RGO3 prepared by two-step synthesis (first polymerization) has the second highest specific capacitance value 538 F/g. Because of the different process methods, the electrochemical active area is also different, so two processes of PPy (DBSA) 7RGO3 were tested for a series of electrochemical activities. The results show that PPy(DBSA)7RGO3 prepared by two-step synthesis (first polymerization) has an optimum retention rate of 73% and a long charge and discharge time at 0.5 A/g constant current charge and discharge, and a one-step synthesis method. PPy(DBSA)7RGO3 prepared by simultaneous polymerization and reduction has the largest electrochemical active area and specific capacitance value under cyclic voltammetry (CV) of 5 mV/s.