Abstract
Lately, polymers as electrochemical catalysts have attracted intense interest. As two promising candidates, herein, electrochemically deposited polyaniline and poly(aspartic acid) thin film materials have been fabricated on glassy carbon electrodes. Through multiple characterizations, including attenuated total reflection Fourier transform infrared spectrophotometry, cyclic voltammetry, electrochemical impedance spectroscopy, and proton nuclear magnetic resonance, essential properties of these two electro-synthesized polymers, especially the capacity in electrochemically catalyzing the oxidation of electro-active isomers of hydroquinone and catechol, have been investigated. The polymer-modified electrodes present improved conductivity, and diffusion-dominated redox behaviors of hydroquinone and catechol at both modified glassy carbon electrodes are observed. In addition, quantitative proton nuclear magnetic resonance spectra provide the evident information on the electrochemically induced molecular transformation, which confirms the better electrochemical activity of poly(aspartic acid).
Highlights
Amongst all catalysts, polymers prepared via electro-polymerization, a technique with high degree of control during polymerization reactions,[1] have attracted many attentions
Electrochemical catalytic performances of PANI and poly(aspartic acid) (PASP) have been investigated through the electro-oxidation of HQ and CC, with 1H-nuclear magnetic resonance (NMR) spectra as the monitor of reactant consumption and product generation, along with other characterization techniques of attenuated total reflection Fourier transform infrared (ATR-FTIR) spectrophotometry, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS)
Polymer-modified electrodes were prepared on the electrochemical workstation via cyclic voltammogram deposition, with PANI-glassy carbon electrodes (GCEs) gotten in a mixture solution of ANI (0.5 M) and HClO4 (1 M) at a scanning rate of 50 mV/s from -0.2 V to 0.9 V for 10 segments, and PASP-GCE in ASP (0.01 M, pH = 7) at 100 mV/s from -1.5 V to 2.0 V for 20 segments
Summary
A comparative study on PANI and PASP as catalysts for HQ and CC electrochemical oxidation is presented. Electrochemical catalytic performances of PANI and PASP have been investigated through the electro-oxidation of HQ and CC, with 1H-NMR spectra as the monitor of reactant consumption and product generation, along with other characterization techniques of attenuated total reflection Fourier transform infrared (ATR-FTIR) spectrophotometry, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Results obtained demonstrate that PASP displays higher electro-catalytic activities in both redox systems
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