First NameYilkal
Last NameDessie
Emailyilikaldessie@gmail.com
Supervisor NameShimelis Admasie
UniversityAdama Science and Technology University
CountryEthiopia
KeywordsLignin; Poly(o-phenylenediamine);Pyrrole; 4-amino-3-hydroxynaphthalenesulfonic acid; Composite; Electrosynthesis; Cyclic voltammetry; Electrochemical quartz crystal microbalance; Fourier transform infrared spectroscopy
Publication Date28 March, 2017
DegreeMasters
DomainChemistry

Electrochemical study of conducting Polymer/Lignin Composites

Abstract: Electropolymerization of lignin composites in HNO3, H2SO4 and characterization of the formed film were studied by cyclic voltammetry (CV), electrochemical quartz crystal microbalance (EQCM), and Fourier transform infrared spectroscopy (FTIR). Oxidation of lignin composites mixed with different polymers at a glassy carbon electrode was
performed by cyclic voltammetry in a three-electrode electrochemical cell. EQCM was used during polymerization technique and detecting the continuous mass increase with the number of potential cycles. The redox behavior of the individual lignin and its composite films were studied by CV in monomer free, HNO3 and H2SO4supporting electrolyte solutions. The electrochemical responses from the anodic and cathodic peaks of the composites film were found to consist of a strongly increasing current, charge, and charge storing capacity even the average surface coverage was higher. Both the anodic and the cathodic reactions observed from CV were reversible redox couple and the films have adsorption characteristics. Transmission FTIR spectra of the electropolymerized film of pyrrole and lignin composite polymer after deposition were recorded. These
results gave evidence of lignin composite formation due to the fact that new and broad bands in the region of 3411−3460 cm−1 were observed.

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