Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 26, Pages 6172-6177Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.05.075
Keywords
Polyaniline; Electrodeposition; Nucleation; Morphology; pH controlled structure
Categories
Funding
- China Scholarship Council
- National Natural Science Foundation of China [50372011]
- Natural Science Foundation of Liaoning Province, China [20052016]
- DCU
- China-Ireland Collaboration Funding
- SFI
- RCS
- CMOST
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Electrodeposition of polyaniline (PAni) was performed across a broad pH range from pH 0.0 to 14.0. PAni films were found to grow from strong acidic environments at much faster rate and appeared to adopt different growth patterns from those grown from higher pH media, thus producing PAni films with very different morphologies ranging from nanofibres to microsized tubules to flakes like structures. The various morphologies of the PAni films were results of homogeneous and heterogeneous nucleation during electrochemical polymerization. These phenomena occurred under specific conditions which could be induced by varying the pH of the reaction media. Characteristic IR absorptions of the films deposited from increasing pH environment indicated little differences in chemical structure of the polymers except for the film grown from pH 14.0. Cyclic voltammetry data also indicated different electron transfer efficiency as a result of different morphology adopted. All except for PAni films obtained from pH 2.0 to 4.0 gave high specific capacitance at around 450 Fg(-1) in 0.5 M H2SO4 and in 1.0 M NaNO3 (pH 1.0) solution using 1.0 mA cm(-2) charging and discharging current density. (C) 2009 Elsevier Ltd. All rights reserved.
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