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Activity of Platinum−Gold Alloys for Glucose Electrooxidation in Biofuel Cells

2007; American Chemical Society; Volume: 111; Issue: 34 Linguagem: Inglês

10.1021/jp0720183

1520-6106

Aurélien Habrioux, Éric Sibert, Karine Servat, W. Vogel, Kouakou Boniface Kokoh, Nicolás Alonso‐Vante,

Electrocatalysts for Energy Conversion

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 Pt20Au80. This catalyst composition displayed the best catalytic activity in steady-state conditions in comparison with Pt50Au50 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).