Centro de Investigación y Desarrollo Tecnológico en Electroquímica

About: Centro de Investigación y Desarrollo Tecnológico en Electroquímica is a based out in . It is known for research contribution in the topics: Cyclic voltammetry & Catalysis. The organization has 537 authors who have published 682 publications receiving 10382 citations. The organization is also known as: Centro de Investigacion y Desarrollo Tecnologico en Electroquimica & Center of Research and Technologic Development in Electrochemistry.

Disperse red 1 and reactive red 2 – modified nanoparticulate TiO2 films as photoanodes for studying photovoltaic properties of textile azo dyes

Abstract: Here we report the preparation of dye-sensitized solar cells containing disperse red 1 (RD1)- or reactive red 2 (RR2)-modified nanoparticulate TiO2 photoanodes and their charge carrier dynamics under visible light illumination. Photoelectrochemical data obtained for both devices indicated that the photoinduced charge generation process was significantly better for RR2-sensitized solar cells than for DR1-sensitized solar cells. The effectiveness of the photoinduced charge generation observed for the RR2-sensitized TiO2 photoanodes was explained by invoking two complementary phenomena which can be promoted in the presence of the voluminous 1,3,5-triazine moieties of RR2: (a) delay of the increment of I3− ions concentration into the dyed-TiO2 pores, due to their known capabilities for establishing charge transfer complexes between N atoms of the heterocyclic ring and I atoms of the electrolyte; and (b) reduction of the electron interception process, due to the reaction established between photogenerated electrons and I3− anions of the electrolyte.

Underpotential deposition of Cu on partially oxidized Rh electrodes

Abstract: The underpotential deposition (UPD) of copper on partially oxidized rhodium electrodes was studied in acid medium using potentiodynamic techniques. The process was analyzed as a function of the potential and time of deposition. The potentiodynamic I-E patterns for the oxidative dissolution of Cu provide evidence for the existence of a chemical reaction between Cu and oxygen existing on the electrode surface. Redistribution of the active sites is also possible when appreciable quantities of oxidized species are simultaneously reduced by the UPD process. The partially oxidized rhodium electrodes were prepared by cyclic voltammetry and anodic polarization. The later method provided the most oxidized surfaces, but, even in this case, the degree of oxygen surface coverage was lower than that corresponding to a monolayer.

Synthesis and Characterization of Multilayer Films of Dendrimer-Assembled C60 Materials on Nanocrystalline TiO2 Electrodes

Abstract: Nanocrystalline TiO2 electrodes were silanized and further modified with C60 fullerene films linked by Starburst™ (PAMAM G0.0) dendrimers of poly(amidoamine), generation 0.0, using a layer- by-layer technique into either branched dendritic or linear structures. The resulting films provide organized nanoassembled photoactive surfaces that adsorb in the visible region and offer a high molar extinction coefficient. The linear nanocomposite structure in particu- lar increases the photocurrent efficiency of the polycrystalline TiO2 and decreases the recombination effect, yielding a global collection efficiency of 0.14%. Keywords: Modified electrodes, fullerene C60, dendrimers, TiO2, silanized, photovoltaic cells. Resumen: Electrodos nanocristalinos semiconductores de TiO2 fue- ron silanizados y modificados con peliculas de fulereno C60 y dendri- meros de poli(amidoamina) generacion 0.0 (PAMAM G0.0), usando la tecnica de capa-por-capa en una secuencia dendritica y lineal. Las peliculas resultantes proporcionan superficies nanoensambladas foto- activas organizadas que, ademas de absorber en la region visible, pre- sentan altos coeficientes de extincion molar. En particular, la organi- zacion lineal incremento la eficiencia de fotocorriente del TiO2 poli- cristalino minimizando el efecto de recombinacion, con lo que se alcanzo una eficiencia de coleccion global del 0.14%. Palabras clave: Electrodos modificados, fulereno C60, dendrimeros, TiO2, silanizado, celdas fotovoltaicas.