Self-Supported Polypyrrole/Polyvinylsulfate Films: Electrochemical Synthesis, Characterization, and Sensing Properties of Their Redox Reactions.
Thick films of polypyrrole/polyvinylsulfate (PPy/PVS) blends were electrogenerated on stainless-steel electrodes under potentiostatic conditions from aqueous solution. The best electropolymerization potential window was determined by cyclic voltammetry. After removing the film from the back metal, self-supported electrodes were obtained. Voltammetric, coulovoltammetric, and chronoamperometric responses from a LiClO4aqueous solution indicated the formation of an energetically stable structure beyond a reduction threshold of the material. Its subsequent oxidation required higher anodic voltammetric overpotentials or longer chronoamperometric oxidation times. This structure was attributed to the formation of lamellar or vacuolar structures. X-ray photoelectron spectroscopy analysis of the films under different oxidations states revealed that the electrochemical reactions drive the reversible exchange of cations between the film and the electrolyte. The electrical energy and the charge consumed by the reversible reaction of the film under voltammetric conditions between the constant potential limits are a function of the potential scan rate, that is, they sense the working electrochemical conditions.
Centre for Electrochemistry and Intelligent Materials (CEMI) Universidad Politécnica de Cartagena (UPCT) Aulario II 30203 Cartagena Spain.
Toribio F
0000-0002-8517-1428
TF
Otero
Centre for Electrochemistry and Intelligent Materials (CEMI) Universidad Politécnica de Cartagena (UPCT) Aulario II 30203 Cartagena Spain.
Lluis X
LX
Martinez-Soria
Arquimea Ingeniería S.L.U. Calle Margarita Salas, 10 (Pol Ind Leganec) 28918 Leganés Madrid Spain.
Johanna
0000-0001-8266-8570
J
Schumacher
Centre for Electrochemistry and Intelligent Materials (CEMI) Universidad Politécnica de Cartagena (UPCT) Aulario II 30203 Cartagena Spain; Engineering School Universidad Autónoma del Estado de México Toluca 50000 Mexico.
Laura
0000-0001-6186-7896
L
Valero
Centre for Electrochemistry and Intelligent Materials (CEMI) Universidad Politécnica de Cartagena (UPCT) Aulario II 30203 Cartagena Spain.
Victor H
0000-0002-7661-7184
VH
Pascual
conducting materials; coulovoltammetry; electrochemistry; lamellar structures; polymer composites