Activity of platinum-gold alloys for glucose electrooxidation in biofuel cells.
Carbon supported Pt-Au catalysts with different bimetallic compositions were prepared by water in oil (w/o) microemulsion. Carbon Vulcan XC-72 was added during the synthesis of particles in order to obtain their good dispersion and a mean particle size distribution of 5.02 +/- 0.56 nm. Structural characterization was performed using XRD at wide angles (WAXS), which showed that Pt-Au particles exhibited alloy properties. Electrochemical characterization allowed to estimate the surface composition of Pt-Au alloys, which was close to that of the bulk material Pt(20)Au(80). This catalyst composition displayed the best catalytic activity in steady-state conditions in comparison with Pt(50)Au(50) or Pt and Au alone. Moreover, a Pt-Au/C catalyst with a metal loading of 40 wt % was immobilized onto a carbon porous tube as anode. A membrane-less biofuel cell was tested using laccase/ABTS biocathode in phosphate buffer (pH 5).
Habrioux
A
A
Laboratory of Electrocatalysis, UMR 6503 CNRS, University of Poitiers, 40 Avenue du Recteur Pineau 86022 Poitiers Cedex, France.
Sibert
E
E
Servat
K
K
Vogel
W
W
Kokoh
K B
KB
Alonso-Vante
N
N
D002384:Catalysis; D004563:Electrochemistry; D004655:Emulsions; D004800:Enzymes, Immobilized / Q000737:chemistry; D005947:Glucose / Q000737:chemistry*; D005949:Glucose Oxidase / Q000737:chemistry; D006047:Gold Alloys / Q000737:chemistry*; D042845:Laccase / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation*; D010084:Oxidation-Reduction; D010984:Platinum / Q000737:chemistry*; D013499:Surface Properties
D004655:Emulsions; D004800:Enzymes, Immobilized; D006047:Gold Alloys; D010984:Platinum; D005949:Glucose Oxidase; D042845:Laccase; D005947:Glucose