期刊
SYNTHETIC METALS
卷 220, 期 -, 页码 300-310出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2016.06.028
关键词
Polypyrrole; Graphene oxide; Hybrid material; Membrane; Scanning electrochemical microscopy; Electrochemical impedance spectroscopy
资金
- Spanish Ministerio de Ciencia e Innovacion [CTM2011-23583]
- Conselleria d'Educacio, Formacio i Ocupacio (Generalitat Valenciana) [APOSTD/2013/056]
- Spanish Ministerio de Ciencia y Tecnologia
Polypyrrole (PPy) doped with graphene oxide (GO) has been electrochemically obtained by potentiostatic synthesis and its electrochemical behavior as membrane material has been studied for the first time. Fourier transform infrared spectroscopy with attenuated total reflection showed the formation of the hybrid material due to presence of PPy and GO bands. Field emission scanning electron microscopy micrographs showed the effective incorporation of GO sheets and the formation of a 3-D porous material with high surface area. Scanning electrochemical microscopy of PPy/GO films showed positive feedback close to the ideal conducting behavior, indicating a good electroactivity. Electrochemical impedance spectroscopy (EIS) was employed to measure the electrochemical properties of the coatings by two-, three-, and four-electrode configurations. The electronic conductivity of PPy/GO film, measured between two metallic conductors, was 4.7.10(-6) S/cm. Its ionic conductivity was superior (1.6.10(-3) S/cm) due to the high porosity of the material as demonstrated by cyclic voltammetry and EIS measurements, where the PPy/GO film was employed as a free-standing membrane. The diffusion-migration rate of tetramethylammonium chloride was very similar to sodium chloride when present in the same concentration, which indicated no influence of the size of the electrolyte conductor due to the high porosity. (C) 2016 Elsevier B.V. All rights reserved.
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