Assembly of thin mesoporous titania films and their effects on the voltammetry of weakly adsorbing redox systems

摘要: Abstract Titania (anatase) films composed of nanoparticulate building blocks are formed in a layer-by-layer deposition procedure followed by calcination. Field emission gun scanning electron microscopy (FEGSEM) and conducting probe atomic force (C-AFM) techniques used to assess the topography electrical conductivity resulting titania dry state. Two types molecular binder, cyclohexane hexacarboxylic acid phytic acid, employed process. The surface charge is dramatically affected presence phosphate (from acid) after pyrolysis binder. Voltammetric responses for Ru ( NH 3 ) 6 + / 2 redox system obtained at mesoporous coated electrodes immersed aqueous KCl strongly adsorption phosphate. In order further investigate effects membrane on voltammetric features, an approximate transport model supported simple numerical simulation (of explicit finite-difference type) with reversible adsorption/desorption equilibria developed. Based comparison experimental data, it proposed that (electron diffusion) within wet film potential range where reduction occurs important addition ion transport.