Study On Preparation Of Conductive Polymer And Their Electrochemical Properties

This paper mainly studies the relationship of the preparation conditions, morphologies and electrochemical properties of conducting electric polymer (CEP). CEPs have been explored the application for the supercapacitive materials. The research contents involve as follows.(1) The porous nanospheric polypyrole (PPy) has been synthesized by using nanosized calcium carbonate as expendable template. The electrochemical performance of PPy has been carried out in acidic, neutral and alkaline electrolytes. The measurement results show that porous nanospheric PPy performs excellent capacitances (328 F-g"'and 307 F·g-1 at the scan rate of 2 mV·s-1, respectively) in H2SO4 and KC1 solution, exhibiting the very large specific capacitance (681 F·g-1) in KOH solution. The high stability and large specific capacitance make PPy as the potential material for supercapacitors.(2) The synthesis methods of polyaniline (PAni) and their electrochemical performance have been investigated. The results show that the specific capacitance of PAni prepared by using ammonium persulfate as oxidant is not very high, the capacitance only is 425 F·g-1 at the scan rate of 2 mV·s-1, and the cycle-life test shows that the capacitance of as-prepared PAni has declined by 47.6% when the cycles reached 400, indicating that the pure PAni is not an ideal supercapacitive material.(3) 2-dimensional hexagonal structure of ordered mesoporous carbon has been prepared by using silica template, and OMC/PAni composite has been obtained by using chemical oxidation polymerization. The characterization of FT-IR and TEM shows that PAni had been loaded on the surface of mesoporous carbon obviously. The electrochemical test shows that OMC and PAni has a strong synergistic effect. The synergistic effect can not only increase the capacitance of the composite and energy density, the capacitance is up to 469 F-g"1 at 2 mV·s-1 and the power density is 112 W·kg-1 when the energy density reaches 76.4 Wh-kg"1, but also enhance the stability of the composite. In addition, the potential window of the composite is widened, up to 1.1V, indicating that OMC/PAni composite is a potential material for supercapacitor.