Electrochemical characteristics of supercapacitor electrode using MnO2 electrodeposited carbon nanofiber mats from lignin-g-PAN copolymer

초록

The MnO₂ electrodeposited on the surface of the carbon nanofiber mats (MnO₂-LCNFM) were prepared from electrospun lignin-g-PAN copolymer via heat treatments and subsequent MnO₂ electrodeposition method. The resulting MnO₂-LCNFM was evaluateed for its potential use in a supercapicitor electrode. The increase of MnO₂ electric deposition time was revealed to increase diameter of carbon nanofibers as well as MnO₂ content on the surface of carbon nanofiber mats as confirmed by scanning electon microscope (SEM) analysis. The electrochemical properties of MnO₂-LCNFM electrodes are evaluated through cyclic voltammetry test. It was shown that MnO₂-LCNFM electrode exhibited good electrochemical performance with specific capacitance of 168.0 mF.cm-2. The MnO₂-LCNFM supercapacitor successfully fabricated using the gel electrolyte (H3PO4/Polyvinyl alcohol) showed to have the capacitance efficiency of ∼90%, and stable behavior during 1,000 charging/discharging cycles.

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