A study on the electrochemical behaviour of polypyrrole films in concentrated aqueous alkali halide electrolytes

Jafeen, M. J. M.; Careem, M.A.; Skaarup, Steen

doi:10.1007/s11581-013-1005-z

Cited by 3 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[50][51][52][53][54][55][56][57][58] Many actuators use sputtered or thermally evaporated gold films as supports of the conducting polymer films. 13,16,[59][60][61][62][63][64][65][66][67][68][69][70][71] Here, the effect of different experimental variables (temperature, applied current and electrolyte concentration) on the evolution of the PPy dimensions (electro-chemo-mechanical or electro-chemodynamical characterization) supported by gold wires will be followed using a Laser Scan Micrometer (LSM). 72 The presence of some parallel hydrogen evolution will also be checked and quantified and its strong influence on the actuation results is discussed here.…”

Section: Introductionmentioning

confidence: 99%

Electrochemo-dynamical characterization of polypyrrole actuators coated on gold electrodes

Martínez

Otero

Jager

2016

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Polypyrrole coated gold wires were subjected to consecutive square current waves in LiClO4 aqueous solutions using the same constant anodic and cathodic charge. Parallel in situ diameter variations were followed using a laser scan micrometer. The procedure was repeated by changing one experimental variable every time: applied current, electrolyte concentration or working temperature to perform electrochemodynamical characterization of the system. On average, the diameter follows a linear variation of the consumed charge, as expected for any faradaic system, although a high dispersion was attained in the data. Such deviations were attributed to the presence of irreversible hydrogen evolution at the gold/polypyrrole interface at cathodic potentials more than 0.0 V vs. Ag/AgCl, detected and quantified from separated coulovoltammetric responses. Despite this parallel hydrogen evolution the consumed energy during reactions is a robust sensor of the working conditions. In conclusion a gold support, the metal most used for technological applications of conducting polymers, should be avoided when a device is driven by current flow in the presence of aqueous solutions, water contamination or moisture: a fraction of the charge will be consumed by hydrogen generation with possible degradation of the device.

show abstract