Browsing by Author "Ortega, E."
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- ItemCapacitors Based on Polypyrrole Nanowire Electrodeposits(2022) Ramirez, A. M. R.; del Valle, M. A.; Ortega, E.; Diaz, F. R.; Gacitua, M. A.The electrochemical polymerization of polypyrrole nanowires is carried out using potentiodynamic and galvanostatic methods in order to enhance the performance of the modified electrodes as capacitor devices. The electrochemical, spectroscopic, and morphological properties are determined through cyclic voltammetry, Raman spectroscopy and scanning electron microscopy, respectively, corroborating the presence of PPy-nw in dimensions of 30 nm in diameter. Characterization as a capacitor revealed that the nanowire structure enhances key parameters such as specific capacitance with 60 times greater value than bulk polymer modification, in addition to a significant increase in stability. In this way, it is verified that electrodes modified with polypyrrole nanowires obtained in situ by electrochemical methods constitute an excellent candidate for the development of capacitors.
- ItemElectrochemical in situ synthesis of polypyrrole nanowires(2019) Ramirez, A. M. R.; Gacitua, M. A.; Ortega, E.; Diaz, F. R.; del Valle, M. A.Modification with polypyrrole nanowires, PPy-nw, is accomplished directly upon the working electrode by electrochemical polymerization methods using mesoporous silica as a template. The silica template is prepared by a potentiostatic method, generating a homogeneous film over a previously deposited thin layer of PPy, so that PPy-nw grows within the nanochannels of the mesoporous silica and adheres firmly to the surface. Subsequently the template is removed to obtain intact Pt vertical bar PPy-nw with stable and reproducible electrochemical properties, and with an enhanced (about 360 times higher charge capacity) response after charge-discharge experiments compared to equivalent electrodes modified with polymer deposits in the bulk (PPy) form. SEM reveals the brush-type conformation of PPy-nw (30 nm in diameter). Thus, a cheap, simple, highly repeatable method is used in situ to prepare electrodes modified with nano-structured polymers, using electrochemical techniques alone. This could have a great impact on a wide range of applications of conducting polymers.
- ItemEnhancement of electrodes modified by electrodeposited PEDOT-nanowires with dispersed Pt nanoparticles for formic acid electro-oxidation(2017) Ramírez, M.; Valle de la Cortina, María Angélica del; Armijo Mancilla, Juan Francisco; Díaz, F.; Pardo, M.; Ortega, E.
- ItemInfluence of the electrolyte salt on the electrochemical polymerization of pyrrole. Effects on p-doping/undoping, conductivity and morphology(2018) Valle de la Cortina, María Angélica del; Ramirez, A.M.; Díaz, Fernando R.; Pardo Roa, María Angélica; Ortega, E.; Armijo Mancilla, Juan Francisco
- ItemOn the use of multiple stacked active layers in organic photovoltaic cells(2020) Cattin, L.; El Jouad, Z.; Siad, M. B.; Morsli, M.; Arzel, L.; Ortega, E.; Louarn, G.; Neculqueo, G.; Lamkaouane, H.; Khelil, A.; Addou, M.; Valle Delaware la Cortina, María Angélica del; Mir, F.; Bernede, J. C.
- ItemPolyanilines Modified Electrodes to be Assayed as Halides Sensors(2015) Ortega, E.; Díaz, F. R.; Hernández, L. A.; Valle de la Cortina, María Angélica del
- ItemSynthesis, characterization and photo physical-theoretical analysis of D-pi-A compounds. 2. Chain length effect through even-odd effect on the photophysical properties.(2017) Ortega, E.; Ramírez, A.; Cattin, L.; Díaz. F. R.; Valle de la Cortina, María Angélica del; Bernede, J. C.; Ortega, E.; Ramírez, A.; Cattin, L.; Díaz. F. R.; Valle Delaware la Cortina, María Angélica del; Bernede, J. C.
- ItemSynthesis, characterization and photophysical-theoretical analysis of compounds A-pi-D. 1. Effect of alkyl-phenyl substituted amines in photophysical properties.(2017) Ortega, E.; Montecinos Escobar, Rodrigo Andrés; Cattin, L.; Díaz, F. R.; Valle de la Cortina, María Angélica del; Bernede, J. C.