Improving the electrochemical performance of Nano-PANI by adding manganese

摘要

In order to improve the electrochemical performance of PANI, we prepared Mn_(2+)or Mn~(2)O~(3)doped PANI nanomaterial by interfacial polymerization or in situ polymerization method. The SEM pictures showed that all samples were irregular short nano-rods; the FT-IR and XPS detected the quinone ring and benzene ring information in PANI and especially the XPS showed that manganese existed in the form of Mn~(2)O~(3)in a sample; the BET tests showed that the Mn doping is beneficial to increase the specific surface area of the doped sample. The electrochemical property of all samples was studied by a three-electrode system in 0.5 mol/L H~(2)SO~(4). It was found that at the current density of 1 A/g, the maximum specific capacitance of pure PANI was only 378 F/g, which was obviously lower than that of doped samples. Among the doped samples, Mn~(2)O~(3)/PANI had the best performance. Its specific capacitance was 719 F/g, and its capacitance retention was over 90% after 2000 charge–discharge cycles at 10 A/g. Afterwards, the mechanism of improving the electrochemical behavior of nano-PANI by adding manganese was also discussed.