Abstract Solar cells sensitized with an azo dye (dispersed red 1) mixed with graphene and graphene oxide by the electrophoresis method in acid medium applying a voltage of 3V at a time of 15 seconds were developed, these conditions allowed to deposit the layer satisfactorily semiconductor and subsequently properly confine the sensitizer. All cells were thermodynamically stable. The cells sensitized with disperse red 1 and disperse red 1 mixed with graphene and graphene oxide reported overall efficiencies of 0.12, 0.34 and 0.21 respectively. The maximum power calculated from the measured current density and voltage data for cells sensitized with dispersed red 1 and disperse red 1 mixed with graphene and graphene oxide were 9.68 W/cm2 x 10-3 W/cm2, 11.74 W/cm2 x 10-3 W/cm2, and 19.19 W/cm2 x 10-3 W/cm2 respectively. All photoelectrodes had stable confinement between the sensitizer and the semiconductor phase.

Resumen Se desarrollaron celdas solares sensibilizadas con un tinte tipo azoico (rojo disperso 1) mezclado con grafeno y óxido de grafeno, por el método de electroforesis en medio ácido aplicando un voltaje de 3V a un tiempo de 15 s, dichas condiciones permitieron depositar satisfactoriamente la capa semiconductora y posteriormente confinar adecuadamente el sensibilizador. Todas las celdas fueron termodinámicamente estables. Las celdas sensibilizadas con colorante rojo disperso 1 y rojo disperso 1 mezclado con grafeno y óxido de grafeno reportaron eficiencias globales de 0.12, 0.34 y 0.21 respectivamente. Las potencias máximas calculadas a partir de los datos de densidad de corriente y voltaje medidos para las celdas sensibilizadas con rojo disperso 1 y rojo disperso 1 mezclado con grafeno y óxido de grafeno fueron de 9.68 W/cm2 x 10-3 W/cm2, 11.74 W/cm2 x 10-3 W/cm2, 19.19 W/cm2 x 10-3 W/cm2 de manera, respectiva. Todos los fotoelectrodos elaborados presentaron confinamiento estable entre el sensibilizador y la fase semiconductora.

In the present work TiO2 films were formed over Indium Tin Oxide (ITO) employing cathodic electrophoretic deposition (Cathodic-EPD) and Dr. Blade Technique. The films were characterized by electrochemical techniques in order to compare their electronic properties; as well as, their photoelectrochemical behavior. The electrochemical performance showed by the films, allowed to relate the modification occurring during the Cathodic-EPD, with the partial reduction of TiO2 nanoparticles, generating Ti3+ defects. These trapping states are modifying the electronic properties of the film, and diminishing the transport of the photoelectrogenerated electrons toward ITO.

Este artigo descreve a fixação de ferrocenos (Fc) sobre eletrodos policristalinos de ouro, por filmes dendrímeros de poliamidoamina (PAMAM). A superfície eletroativa fornece uma rota viável para investigar quantitativamente a ligação do ferroceno com a ciclodextrina (CD). Em particular, as medidas eletroquímicas, revelam o efeito das interações adsorção-adsorção sobre a constante de associação K, na interface eletrodo-eletrólito, durante a formação do complexo de 1:1 βCD •Fc. Os resultados obtidos a partir da investigação da isoterma de adsorção de Frumkin indicam que as interações podem ter um forte impacto na afinidade do βCD com as superfícies do ferrocenil modificado, estudadas aqui. A técnica apresentada pode ser útil para investigar outras reações de ligação entre hóspede-hospedeiro.

This paper describes the tethering of ferrocene (Fc) onto polycrystalline gold electrodes by immobilized polyamidoamine (PAMAM) dendrimers films. The resulting electroactive surface provides a viable route for investigating quantitatively the host-guest binding of ferrocene with cyclodextrin (CD). In particular, electrochemical measurements reveal the effect of adsorbate-adsorbate interactions on the association constant K for the formation of the 1:1 βCD•Fc complex at the electrode-electrolyte interface. The results obtained from fitting the Frumkin isotherm to the adsorption data indicate that adsorbate-adsorbate interactions can have a strong impact on the βCD affinity for the ferrocenyl-modified surfaces studied here. The technique presented may be useful for investigating other host-guest binding reactions.