Efficient sensing of nitrite by Fe(bpy)32+ immobilized Nafion modified electrodes

Abstract

Fe(bpy)(3)(2+) (where bpy = 2,2' bipyridyl) immobilized Nafion (Nf) modified glassy carbon electrodes were prepared and they showed excellent electrocatalytic oxidation of nitrite (NO(2)(-)) which leads to the sensitive determination of NO(2)(-). Electrostatic repulsion between NO(2)(-) and Nf film is greatly decreased when Nf film is fully exchanged with cations.

Correlation of structural differences between Nafion/polyaniline and Nafion/polypyrrole composite membranes and observed transport properties

“…Proton conducting cation-exchange membranes are used in a wide variety of applications, such as fuel cells [1][2][3], batteries [4,5], electrochemical devices [6,7] and sensors [8,9]. At present Nafion ® (DuPont) is the most commonly used material to fabricate proton conducting membranes.…”

Selective determination of isoniazid using bentonite clay modified electrodes

“…S7. Though this method is selective for the determination of IZ in presence of rifampin, this present method may not be suitable for the determination of IZ in the presence of nitrite or arsenite [8,10,11,18]. Further to validate this method, recovery analysis was done by the addition of varying amounts of standard IZ.…”

“…These results clearly indicate the improvement in the electron transfer kinetics of IZ oxidation in presence of Fe(dmbpy) 3 2+ species. This strong electrocatalysis phenomenon [8][9][10][11] can be applied for the quantitative determination of IZ. For that, cyclic voltammograms in the presence of increasing concentrations of IZ (from 10.0 µM to 100.0 mM) is analyzed using GC/Na + -bt/Fe(dmbpy) 3 2+ electrode which are shown in Fig.…”

“…Coating the surface of GC with a film of appropriate modifier which can accommodate/incorporate suitable electrocatalyst can achieve this goal. We have reported recently our work on the development of electrochemical sensors for nitrite, IZ and arsenite based on metal complexes of iron immobilized electrodes [8][9][10][11]. There is a wide range of modifiers (organic polymers and inorganic matrixes with or without ion exchange groups) which can be used for the purpose [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Electrocatalytic Oxidation and Determination of Cysteine at Oxovanadium(IV) Salen Coated Electrodes

“…To avoid this type of problem, generally modified electrodes with immobilized electrocatalysts are used. For efficient immobilization of electrocatalysts, electrode modifiers such as Nafion, organic polymers, clays, zeolites, and sol-gel silica materials are largely used [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Coating of such electrode modifiers not only avoids the electrode poisoning but also disperses the electrocatalyst uniformly on the electrode surface and increases the active surface area [43][44][45].…”