Electrocatalytic reduction of hydrogen peroxide at nanostructured copper modified electrode

Abstract

The electrocatalytic reduction of hydrogen peroxide (H 2 O 2 ) has been studied at nanostructured copper (Cu nano ) modified glassy carbon (GC/Cu nano ) electrode in phosphate buffer (pH 7.2). The electrical properties of GC/ Cu nano modified electrodes were studied by electrochemical impedance spectroscopy (EIS). Surface and electrochemical characterization were carried out by using atomic force microscopy (AFM) and cyclic voltammetry. A well-defined H 2 O 2 reduction signal, which is due to mediation of a surface active site redox transition exhibits at the GC/Cu nano electrode. The Cu nano is acting as a bridge without the aid of any other electron mediator, which enables the direct electron transfer between the modified electrode and the substrate. The results are compared with bulk copper macroelectrode and emphasized the efficiency of the Cu nano modified electrode. Systematic investigations were made to optimize the experimental parameter, such as applied potential (E app ) for copper electrodeposition. The calibration curve obtained from chronoamperometric studies was found to be linear in the range 0.5 to 8.0 lM H 2 O 2 with a detection limit of ca.10 nM (S/N = 3) at the GC/Cu nano electrode. The modified electrode is stable for 1 week in phosphate buffer after repetitive measurements.

Hematite Nanoparticles-Modified Electrode Based Electrochemical Sensing Platform for Dopamine

“…The limit of detection (LoD) was calculated to be 1.6  μ M (signal-to-noise ratio ( S / N ) = 3) by substituting the blank standard deviation ( σ = 0.8867) and sensitivity ( m = 1.6546  μ A/ μ M) in the 3σ/m criterion [22]. The response time for each DA addition was observed to be ~3 s, which indicates a fast electron transfer with this modified electrode.…”

Electrochemical fabrication of metallic nanostructured electrodes for electroanalytical applications

“…In several instances lower detection limits have been reported than those found at enzymatic sensors. 46,128,[137][138][139] Several successful examples of these non-enzymatic peroxide sensors have been demonstrated by Bolshakov et al 46 and Lupu et al, 128 who both reported a LOD of 1 nM for their PB films. The former utilised electrodeposited PB on Au microelectrodes, whilst the latter used a polystyrene-based physical templating method to co-deposit polypyrrole and PB.…”

Metal‐Assisted Chemical Etching of Silicon: A Review

“…Because of its relatively low electrochemical potential, Cu is easily oxidized even in an etchant containing a mild oxidant such as Fe 3+ 51. Therefore, Cu particles loaded on the Si substrate vanished in a typical etchant in a couple minutes, leaving the open question of whether Cu can catalyze the etching of Si, although it has been recently reported that Cu can catalytically reduce H 2 O 2 86…”