Ion Transport Across Liquid|Liquid Interfacial Boundaries Monitored at Generator‐Collector Electrodes

Abstract

Anion transfer processes at a liquid j liquid interface were studied with an interdigitated gold band array electrode. The organic phase, 4-(3-phenylpropyl)-pyridine containing Co(II)phthalocyanine, was immobilised as random droplets at the electrode surface and then immersed into aqueous electrolyte. Oxidation of Co(II)phthalocyanine at the generator electrode was shown to be associated with anion transfer from the aqueous into the organic phase. The corresponding back reduction at the collector electrode with anion expulsion was delayed by the anion/cation diffusion time across the interelectrode gap. A working curve based on a finite difference numerical simulation model was employed to estimate the apparent diffusion coefficients for anions in the organic phase (PF 6 À < ClO 4 À < NO 3 À ). Potential applications in ion analysis are discussed.

Electrochemical Properties of Spinel Cobalt Ferrite Nanoparticles with Sodium Alginate as Interactive Binder

“…Figure 3 shows cyclic voltammograms for the oxidation of 5 mM Fc at a gold‐gold dual‐plate electrode in both dry (vacuum at 80 °C for 24 h, black line) and wet (moisture exposed, red‐dashed line) BMImBF 4 at a scan rate of 10 mVs −1 . Although in dry conditions the generator current response still exhibits peak‐shaped features, the collector response is now sigmoidal with a bigger hysteresis loop indicative of a much slower diffusion process 30. The limiting current for the collector electrode, I lim , can be interpreted in terms of the diffusion coefficients for Fc and Fc + , with the smaller diffusion coefficient dominating (see Equation 2).…”

Electron hopping rate measurements in ITO junctions: Charge diffusion in a layer-by-layer deposited ruthenium(II)-bis(benzimidazolyl)pyridine-phosphonate–TiO2 film

“…For an ideal junction with fast transport (steady state conditions) this parameter should approach zero for slow scan rates. For the case that diffusional transport (here assumed to be approximately one dimensional) occurs, a simplified expression DE H ¼ 0:0071Â vd 2 junction F DappRT [27] can be used to obtain an estimate for the apparent diffusion coefficient D app . In Fig.…”

Residual Porosity of 3D‐LAM‐Printed Stainless‐Steel Electrodes Allows Galvanic Exchange Platinisation

“…Interest in 3D‐printing techniques in chemistry and in electrochemistry is considerable and growing. Conventional lithography offers access to planar structures, for example with generator–collector electrode patterns, but 3D printing promises access to more complex structures with control over the third spatial dimension and printing of complete devices. Several types of 3D‐printing technologies have emerged, for example based on ink jetting, hot nozzle extrusion, “bio‐printing”, and laser‐aided techniques .…”