Electrocatalytic Oxidation of Glucose at Carbon Electrodes Modified with Gold and Gold–Platinum Alloy Nanoparticles in an Alkaline Solution

Abstract

The electrocatalytic oxidation of glucose in an alkaline solution was examined using gold and gold–platinum alloy nanoparticles as catalysts. In electrolysis, the catalytic activity for oxidation of glucose could be kept much longer time at gold nanoparticle-modified electrode than at a gold plate electrode. Preliminary electrolysis results at 0.3 V indicated that current efficiency for oxalate as 18-electron oxidation product at gold nanoparticle-modified electrode was approximately twice higher than that at gold–platinum alloy nanoparticle-modified electrode.

Electrocatalytic oxidation of glucose at gold–silver alloy, silver and gold nanoparticles in an alkaline solution

“…Table 1 shows a summary of controlledpotential electrolysis results. After electrolysis at a potential of À0.3 V using Au nanoparticle modified electrodes, gluconolactone (or gluconate) was only detected by HPLC at a current efficiency of 100%, which results in good agreement with previous papers [24,25]. At Au/Ag nanoparticle modified electrodes, gluconolactone was also detected at a current efficiency of 100% after electrolysis at À0.3 V. These electrolysis results for Au and Au/Ag nanoparticles indicate that a two-electron oxidation for glucose occurred at nanoparticles-modified electrodes at À0.3 V [2,4,5].…”

“…As previously reported, we have already noted advantages in using nanoparticles for the controlled-potential electrolysis of glucose [24,25]. In this study, Au, Ag and Au/Ag nanoparticles modified electrodes in a 0.1 mol dm À3 NaOH solution, experienced current decreases was also much slower than that at gold plate electrodes.…”

“…Preparation of carbon electrodes modified with DT-Au, DT-Ag and DT-Au/Ag nanoparticles DT-Au, DT-Ag and DT-Au/Ag nanoparticle-modified electrodes were prepared as follows [24,25]: A plasticformed carbon plate (PFC, Mitsubishi Pencil Co., Japan, 2.5 cm · 2.5 cm) was used as a substrate electrode. For the preparation of electrodes for cyclic voltammogram measurements, a 50 lL aliquot of DT-Au (5-10 mg ml À1 ), DT-Ag (6-10 mg ml À1 ) and DT-Au/Ag (8-12 mg ml À1 ) nanoparticles in hexane was cast onto a PFC plate (surface area of ca.…”

“…In a previous investigation, we found that the catalytic activity on the controlled-potential electrolysis of glucose was improved by use of carbon electrodes modified with $2 nm core sized gold nanoparticles as catalysts, and electrolysis products were determined along with current efficiencies [24,25]. To our best knowledge, however, the glucose oxidation has not been previously investigated by use of gold-based bimetallic nanoparticles as catalysts.…”

Composition–activity relationships of carbon electrode-supported bimetallic gold–silver nanoparticles in electrocatalytic oxidation of glucose

“…The electrocatalytic oxidation of glucose has been extensively studied for applications in glucose-oxygen fuel cells and for the development of glucose sensors for medical and food industries [1][2][3][4][5][6][7][8][9][10][11]. Electrocatalytic behaviors of glucose oxidation in alkaline media were investigated using Cu, Ni, Fe, Pt and Au electrodes.…”