A comparative study on polyaniline degradation by an electrochemical quartz crystal impedance system: electrode and solution effects |
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| Affiliation: | 1. Department of Chemistry “Ugo Schiff”, University of Florence, via della Lastruccia 3, Sesto Fiorentino, 50019 Florence, Italy;2. CSGI Consortium, via della Lastruccia 3, Sesto Fiorentino, 50019 Florence, Italy;3. Laboratory of Biomaterials & Graft Technology, Institute of Clinical Physiology, National Research Council, via Aurelia Sud, 54100 Massa, Italy;1. Department of Chemistry, Amirkabir University of Technology, Tehran, Iran;2. Corrosion Department, Research Institute of Petroleum Industry (RIPI), P.O. Box 18745-4163, Tehran, Iran;3. Department of Polymer Engineering, Amirkabir University of Technology, Tehran, Iran;1. Department of Chemical Engineering, Changchun University of Technology, 2055 Yanan Street, Changchun 130012, PR China;2. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, PR China;3. National & Local United Engineering Laboratory for Power Batteries, Department of Chemistry, Northeast Normal University, Changchun, Jilin 130024, PR China;4. Mechanical & Electrical Engineering Department, Liao Yuan Vocational & Technical College, 52 Xiancheng Street, Liaoyuan, Jilin 136201, PR China;1. College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China;2. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;3. Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Changsha 410083, China |
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| Abstract: | By combining the piezoelectric quartz crystal impedance (PQCI) and electrochemical impedance spectroscopy (EIS) measurements, we conducted a comparative study on polyaniline (PANI) degradation in different media, HClO4 and H2SO4, and on different piezoelectric quartz crystal (PQC) electrodes, Pt and Au. It is concluded that (1) the PANI film grown on an Au electrode is more stable than that on a Pt electrode; (2) the PANI degradation reaction abides by the zero-order kinetic law in HClO4 with rate constants from 0.17 to 2.25 Hz s?1 on Pt and 0.16 to 0.83 Hz s?1 on Au, but the first-order kinetic law in H2SO4 with rate constants from 2.61×10?3 to 7.00×10?3 s?1 on Pt and 1.00×10?3 to 5.00×10?3 s?1 on Au at different ion concentrations. The contrary effects of ClO4? and SO42? on PANI degradation may be understood from the Hofmeister series of anions; (3) the dissolution of the PANI film bulk, the increase of film porosity and the film attenuation occurred simultaneously during degradation via systematic analyses of the motional resistance (R1)and electrochemical impedance spectra responses, etc. |
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