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Study on Capacitance Property of PANI and Composite Electrode

Author: HeXiaoShu
Tutor: CongWenBo
School: Harbin Engineering University
Course: Applied Chemistry
Keywords: Electrochemical capacitor Polyaniline Polyaniline/multi-walled carbon nanotubes composites Polyaniline/manganese dioxide composites Capacitance performance
CLC: TM53
Type: Master's thesis
Year: 2009
Downloads: 131
Quote: 1
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Abstract


With higher energy density than that of electrostatic capacitor and higher power density than that of batteries electrochemical supercapacitor is considered as new energy storage equipment. Carbon material, metal oxide and conducting polymer are electrode materials researched most extensively nowadays. Among the many conductive polymers, polyaniline (PANI) and its composites are extensively.In this paper, the capacitance performance of polyaniline and Polyaniline/multi-walled carbon nanotubes (PANI/MWCNT) composites were mainly investigated. PANI and PANI/MWCNT composites which containing different amounts of multi-walled carbon nanotubes were synthesized by chemical oxidation method and characterized physically by scanning electron microscopic (SEM), X-ray diffraction (XRD) and IR. In 1mol/L H2SO4、1mol/L Li2SO4、1mol/L Na2SO4 solution, the electrochemical performance of the PANI and PANI/MWCNT electrode were investigated by cyclic voltammetry, galvanostatic charge-discharge tests and ac impedance spectroscopy. The results showed that PANI/MWCNT electrode performed well in lmol/L H2SO4 solution, the specific capacitance of PANI/MWCNT-1 electrode (the percentage content of MWCNT is 5.28%) reached to 523.03 F/g at 5mA/cm2. The composites electrode had better capability of high current than that of PANI electrode, the specific capacitance kept at 489.71 F/g at 50mA/cm2 and was 93.63% of that at 5mA/cm2, but the specific capacitance of PANI at 50mA/cm2 was only 70.17% of that at 5mA/cm2 PANI/MWCNT electrode also performed well in 1mol/L Li2SO4 solution, the specific capacitance of PANI/MWCNT-1 electrode reached to 421.11 F/g at 5mA/cm2, The composites electrode also possessed better capability of high current than that of PANI electrode, the specific capacitance kept at 323.25F/g at 50mA/cm2 and was 76.76% of that at 5mA/cm2, but the specific capacitance of PANI at 50mA/cm2 was only 56.22% of that at 5mA/cm2; PANI/MWCNT electrode performed worse in lmol/LNa2SO4 solution, the specific capacitance of PANI/MWCNT-1 electrode only reached to 213.42F/g at 5mA/cm2. Ac impedance spectroscopy showed that the addition of multi-walled carbon nanotubes could decrease the resistance of composites electrode and remarkably improves capability at higher discharge current.In addition, the capacitance performance of Polyaniline/manganese dioxide composite (PANI/MnO2) was also investigated in this paper. Manganese dioxide is prepared by low temperature solid phase method, and then PANI/MnO2 composites containing different amounts of manganese dioxide was synthesized by chemical oxidation method. The materials were characterized physically by scanning electron microscopic (SEM), X-ray diffraction (XRD) and IR. In 1mol/L H2SO4、1mol/L (NH4)2SO4 solution, the electrochemical performance of the PANI/MnO2 electrode was investigated by cyclic voltammetry, galvanostatic charge-discharge tests and ac impedance spectroscopy. The results show that, MnO2 performed well in 1.0 mol/L (NH4)2SO4 aqueous solution. The specific capacitance of manganese dioxide single electrode reach to 332.6 F/g. PANI/MnO2 electrode which containing manganese dioxide 22.9% performed well in 1.0 mol/L H2SO4, the specific capacitance of the electrode reached to 493.3 F/g. PANI/MnO2 electrode which containing manganese dioxide 82.5% performed well in 1.0 mol/L (NH4)2SO4, the specific capacitance of the electrode reached to 252..2 F/g.

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CLC: > Industrial Technology > Electrotechnical > Electrical > Capacitor
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