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Electrochemical Syntheses of Polypyrrole and Its Application in Supercapacitor

Author: GuoJia
Tutor: LiuXiaoXia
School: Northeastern University
Course: Physical and chemical
Keywords: Polypyrrole Electrochemical polymerization Supercapacitor
CLC: TM53
Type: Master's thesis
Year: 2008
Downloads: 178
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Abstract


Polypyrrole (PPy) has good electrochemical activity , have a good prospect of application in the field of super capacitor . Polypyrrole using electrochemical synthesis of polypyrrole ; using cyclic voltammetry and constant current charge and discharge experimental study using infrared in 0.5 mol · L-1 H2S4 and 1.0 mol L -1 KCl solution capacitance performance; spectroscopy (FT-IR) analysis of the vibration absorption of the polypyrrole ; polypyrrole electrode 1 mol.L- 1 KCI ( pH = 6.0 ) solution as the electrolyte, assembled analog super capacitor , its capacitance properties . The study found that a 0.4 ~ 0.6 V and -0.2 ~ 0.6 V (vs.SCE) potential range than the HS04 - , C1- easy in the polymer doped dedoping PPy in 1 mol · L-1 KCl (pH = 6.0) the solution capacitance outperforms in 0.5 mol · L-1 H2SO4 in . The acidity of the polymerization system has a great influence on the capacitance properties of polypyrrole . Acidity does not exceed [H] = 1.0 mo1 · L-1 , with the increase of the polymerization system acidity polypyrrole prepared in 1 mol · L - 1 KCl ( pH = 6.0) than in the solution the capacitor increases gradually , which , [H] concentration of 1.0 mol · L- 1 prepared when PPy specific capacitance of 544.6 F · g - 1 ( charge and discharge current density : 1 mA · cm-2). Acidity increased [H] = 1.3mol · L-1 when the specific capacitance decreased . FT-IR spectra of the chlorine doped polymer , 3443,1623,1430 cm-1 and 625cm-1 polypyrrole and the Cl- doped characteristic absorption peaks . 1 mol · L - 1 KCl (pH = 6.0 ) solution as electrolyte , assembling a simulation supercapacitor polypyrrole electrode in the potential range of -0.4 ~ 0.6 V (vs.SCE) to 3 mA · cm -2 current density , constant current charge and discharge (cyclic charge and discharge 250 times ) than the capacitance of 136.4 F · g - 1 , the coulombic efficiency of 97.6% .

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CLC: > Industrial Technology > Electrotechnical > Electrical > Capacitor
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