Investigation into Charge Transport Dynamics of [Os(bpy)₂(picolinate)]Cl Nafion Films

Abstract

) and the effect of %loading of redox material was determined for three electrolytes over a range of concentrations. The data obtained implies that charge transfer within the film occurs via a redox site diffusion mechanism. The concentration of redox sites was determined using an approximate film thickness of 7 mm, as determined from profilometry studies. Experiments were also performed using immobilized carbon nanotubes within the redox film in order to examine the impact of the increased surface area and conductivity. The presence of the carbon nanotubes had the effect of doubling the surface coverage values and enhancing D CT 1/2 C M values from 1.9 Â 10 À9 to 16.1 Â 10 À9 mol cm À1 s À1.

Scanning electrochemical microscopy imaging of poly (3,4-ethylendioxythiophene)/thionine electrodes for lactate detection via NADH electrocatalysis

“…Both films demonstrate a dramatic decrease in D CT as the thionine loading increases. This trend suggests a principal role of physical diffusion of the redox species in charge transport through the film, which would be evidence of a reduced mobility at high surface concentration (Warren et al, 2006;Komura et al, 2001;Somasundrum and Bannister, 1997). From this observation, the mechanism of charge transport can be considered as diffusion.…”

Electrochemical studies of osmium-(pyrrole-methyl) pyridine-co-polymers deposited using the membrane template method

“…Os(bpy) 2 Cl 2 was prepared as described previously [21]. Preparation of Os(bpy) 2 PMP(Cl)]PF 6 was adapted from synthetic methods previously described by Warren et al [22] and Serroni et al [23].…”