Electrochemical Performance of Biopolymer/Polypyrrole Composite
Lignosulfonate （Lig）， a by-product of paper processing， is a biomass-derived compound including methoxy and phenolic functional groups， and it can generate pseudo capacitance by the redox reaction. However， it has a poor conductivity，limiting the application directly to supercapacitor electrode material. Herein， the good conductivity Lig/PPy composites were prepared by conducting polymer monomer （Pyrrole） via an in-situ polymerization under the Lig system. The morphology and structure were examined by scanning electron microscopy （SEM） and Fourier transformed infrared（FTIR）. The effect of mass ratio of Rm（Lig : Py） on the electrochemical properties of the compound was reported. When the rational mass ratio of Rm = 1 ∶ 1 was used， LP1 had high capacitance of 346.8 F/g at 1 A/g. Lignosulfonate improved the specific capacitance by 50 F/g and 51.5 % to 60.8 % rate capability from 1 to 10 A/g. LP1 showed a capacitance retention of about 47％ after 1 000 cycles at current density of 10 A/g， which indicated the composite had a good cycle life.
Keywords: lignosulfonate, polypyrrole, electrochemical
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