Large-Area Cylindrical Diamond Electrodes

Abstract

Cylindrical boron-doped diamond (c-BDD) electrodes were prepared onto several substrates materials with areas up to 35 cm 2 . The deposition of well-adherent diamond films onto the outer surface of cylindrical substrates was performed. Several diameter sizes and different substrates materials were studied. Diamond films adherence was improved by increasing the substrate surface roughness and by pyrolising castor oil or polyaniline polymer on substrate surface to accelerate the formation of diamond initial nuclei. Profilometry and scanning electron microscopy were used respectively to measure roughness of surface and to characterize the morphologies of the diamond films. The residual stress in the diamond films was characterized by Raman spectroscopy with depth series analysis. Voltammetric analysis using c-BDD electrodes were performed in acid media, revealing high quality diamond behavior.

Porous Boron-Doped Diamond/Carbon Nanotube Electrodes

“…From the relative areas inside the CV plots, the honeycomb sample has the higher capacitance and, hence, the larger electroactive surface area, , possibly due to the longer carbon nanotubes used in its preparation and their higher real density area. Compared to the voltammogram from the nanostructured BDD electrodes, the voltammogram from the conventional flat BDD electrode looks like a horizontal line, indicating a significantly lower specific surface area. , …”

“…Compared to the voltammogram from the nanostructured BDD electrodes, the voltammogram from the conventional flat BDD electrode looks like a horizontal line, indicating a significantly lower specific surface area. 38,39 The electrochemical properties of the nanostructured CNT template BDD electrodes were investigated by cyclic voltammetry of outer-sphere redox probes. 40 Figure 3b,c compares the voltammetric responses of the three BDD electrodes when oxidizing and reducing (b) 0.5 mM of ferrocene−methanol and (c) 0.5 mM of ferricyanide and 0.5 mM of ferrocyanide as a redox couple.…”