Silver nanoparticle assemblies supported on glassy-carbon electrodes for the electro-analytical detection of hydrogen peroxide

Abstract

Electrochemical detection of hydrogen peroxide using an edge-plane pyrolytic-graphite electrode (EPPG), a glassy carbon (GC) electrode, and a silver nanoparticle-modified GC electrode is reported. It is shown, in phosphate buffer (0.05 mol L(-1), pH 7.4), that hydrogen peroxide cannot be detected directly on either the EPPG or GC electrodes. However, reduction can be facilitated by modification of the glassy-carbon surface with nanosized silver assemblies. The optimum conditions for modification of the GC electrode with silver nanoparticles were found to be deposition for 1 min at -0.5 V vs. Ag from 5 mmol L(-1) AgNO3/0.1 mol L(-1) TBAP/MeCN, followed by stripping for 2 min at +0.5 V vs. Ag in the same solution. A wave, due to the reduction of hydrogen peroxide on the silver nanoparticles is observed at -0.68 V vs. SCE. The limit of detection for this modified nanosilver electrode was 2.0 x 10(-6) mol L(-1) for hydrogen peroxide in phosphate buffer (0.05 mol L(-1), pH 7.4) with a sensitivity which is five times higher than that observed at a silver macro-electrode. Also observed is a shoulder on the voltammetric wave corresponding to the reduction of oxygen, which is produced by silver-catalysed chemical decomposition of hydrogen peroxide to water and oxygen then oxygen reduction at the surface of the glassy-carbon electrode.

Electrochemical detection of hydrogen peroxide on platinum-containing tetrahedral amorphous carbon sensors and evaluation of their biofouling properties

“…However, in detecting H2O2 carbon materials as such do not typically perform as well as noble metals, for instance Au and Pt [9]. It has been shown that pure glassy carbon does not catalyze redox reactions of H2O2 but by modifying the electrode surface for example with Ag [10]- [12], Pd [13], [14], Pt [15] or carbon nanotubes [16] can result in measurable electrochemical reactions. In addition, Hrapovic et al [15] demonstrated with their glassy carbon and carbon nanotube sensors that the detection limit for H2O2 with Ptdoped sensors strongly depends on the type of the carbon support.…”

“…Moreover, the detection of H2O2 on conventional metal or carbon fiber electrodes is hindered by slow kinetics [10], [20] and relatively high overpotential [21], which allows also the oxidation of interfering species, such as ascorbic acid and uric acid [10]. Thus, new materials that facilitate fast and interference-free detection of H2O2 as well as resist biofouling are in demand.…”

Silver nanoparticles decorated on a three-dimensional graphene scaffold for electrochemical applications

“…The electrochemical effect of the Ag nanoparticles on the GF is discussed. We chose silver nanoparticles (as model electro-active nanoparticles) due to the fact that they possess a very high surface area to volume ratio, and have been shown to exhibit electrochemical properties that make them suitable for potential application in electrochemical devices such as sensors [29][30][31] and in fuel cells (i.e. hydrogen-evolution reaction [32] and oxygen-reduction reaction [33]).…”

Electrocatalytic Reduction of Hydrogen Peroxide on Palladium-Gold Codeposits on Glassy Carbon: Applications to the Design of Interference-Free Glucose Biosensor

“…Alternatively, reducing electrochemically H 2 O 2 at low working potentials (usually around 0 V versus Ag/AgCl) [5], where interfering substances are electrochemically inert, allows for a much more selective assay of the analyte. In respect to studies on the surface modified with micro-and nanostructures carbonaceous electrodes as efficient electrocatalysts of hydrogen peroxide, both oxidation and reduction [6][7][8][9][10][11][12][13] are currently on high demand.…”