Catalysis of electrode processes by multiply-charged metal complexes electrostatically bound to polyelectrolyte coatings on graphite electrodes, and the use of polymer-coated rotating disk electrodes in diagnosing kinetic and conduction mechanisms

Preparation and Characterization of GCE Coatings Combining DDDMAB and PDADMAC with FAD and HCM for Electrocatalytic Detection of Oxygen and Sulfur Oxoanions

“…Compared to modified electrode, there is no appreciable oxidation current on unmodified electrode (curve a'). Then, the anodic peak current of Ru(CN) 6 3À/4À redox couple in the modified electrode increased with increasing concentration of SO 3 2À ions. Finally, the peak currents of Fe(CN) 6 3À/4À and FAD/ FADH 2 redox couples were remained unaffected.…”

“…Then, the anodic peak current of Ru(CN) 6 3À/4À redox couple in the modified electrode increased with increasing concentration of SO 3 2À ions. Finally, the peak currents of Fe(CN) 6 3À/4À and FAD/ FADH 2 redox couples were remained unaffected. These observations collectively suggested that electrochemically generated Ru(CN) 6 3À ions mediate the oxidation of SO 3…”

“…The electrochemical properties and stability of modified electro-des were investigated using cyclic voltammetry. The catalytic activity of FAD modified DDDMAB coating and PDADMAC-based hybrid coatings were tested towards reduction of oxygen, S 2 6 ] · xH 2 O, FAD were obtained from Aldrich and were used as received. All other chemicals used were of analytical grade and used without further purification.…”

“…After coating the GCE with DDDMAB (or PDADMAC), the electrode was immersed in pH 7 PBS containing 5 Â 10 À4 M FAD and the potential was repetitively cycled between À 0.6 to þ 1.2 V for immobilization of FAD. GCE/DDDMAB (or PDADMAC)/FAD/hexacyanoferrate and hexacyanoruthenate film-modified electrodes were prepared by cycling the potential of DDDMAB (or PDADMAC) coated GCE at a scan rate of 100 mV s À1 in pH 7 PBS solution containing FAD, Fe(CN) 6 3À and Ru(CN) 6 3À between a desired potential range. Prior to modification, glassy carbon electrode was polished with 0.05 mm alumina on Buehler felt pads and then ultrasonically cleaned for about a minute in water.…”

Electrochemiluminescence detection of methamphetamine based on a Ru(bpy)32+‐doped silica nanoparticles/Nafion composite film modified electrode

“…[10] Therefore, various eff orts to immobilize Ru(bpy) 3 2+ on an electrode surface have been made in order to fabricate an ECL sensor including: (a) a derivate Ru(bpy) 3 2+ complex is absorbed on the electrode surface by non-covalent [11] or covalent interaction; [12] (b) Ru(bpy) 3 2+ is entrapped in the network of a sol-gel fi lm; [14][15][16] (c) Ru(bpy) 3 2+ is used as an additive to fabricate a carbon electrode; [17,18] (d) Ru(bpy) 3 2+ is immobilized with negatively charged nanoparticles using a layer-by-layer method; [13] and (e) Ru(bpy) 3 2+ is incorporated into the cation exchange membrane immobilized on an electrode surface, such as Nafi on fi lm. [19,20] The LB fi lm is easy to wash and the covalent method is complicated. The sol-gel fi lm is easy to crash and has lower water solubility and conductivity.…”