Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4767569 | Electrochimica Acta | 2017 | 26 Pages |
Abstract
In this work nickel modified polymer composites have been synthesized electrochemically for methanol electrooxidation on platinum and graphite electrodes. Ni (II) ions were incorporated on polyaniline and poly (o-aminophenol)(PANI/POAP) bilayer structure from 0.1 M Nickel sulphate hexahydrate solution at open circuit potential (OCP).TheNi (II) deposited composites were characterized with Fourier Transform Infrared (FTIR) spectroscopy, Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). Cyclic voltammetry characterization exhibits stable redox pair of Ni+3/Ni+2 for both electrodes. Fourier transform infrared spectroscopy was used for functional group analysis. Ni (II) peaks were observed in the region of 400-700 cmâ1 along with peaks at 1102 cmâ1 and 1400-1600 cmâ1 for polyaniline and phenoxazine units. The Ni-polymer composite on platinum and graphite electrode followed different phenomenon for methanol electroxidation in alkaline media. The cyclic voltammetry results showed significantly large methanol oxidation on platinum substrate with charge storage capacity of 196 μ F/cm2 for 1.5 M methanol in alkaline media as compared to 8.306 μF/cm2 of graphite. The diffusion controlled linear response for increase rate of methanol concentration has been obtained for Ni (II)/PANI/POAP-Pt. The electrochemical impedance spectroscopy (EIS)results indicated increase in charge storage capacity from 10â4F/cm2 to 10â3 F/cm2 with increasing potentials at lower frequency region.The phase shift was observed from 60-40 degrees for increased potentials at low frequency range in EIS analysis. The increased conductive behavior from 10â5 to 10â2 s/cm2 has been obtained fornickel modified polymer composite at higher frequency region in EIS analysis.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Anwar-ul-Haq Ali Shah, Nabila Yasmeen, Gul Rahman, Salma Bilal,