Anodic oxidation of methanol at a gold-modified platinum electrocatalyst prepared by RF sputtering on a glassy carbon support

✍ Scribed by Masayuki Morita; Yukinori Iwanaga; Yoshiharu Matsuda

• Book ID: 103066701
• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 477 KB
• Volume: 36
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(91)85299-m

✦ Synopsis

A Au-Pt bimetallic model catalyst has been prepared on a smooth carbon support by an RF sputtering method, and its electrocatalytic activity for methanol oxidation has been investigated in a sulfuric acid solution . The activity of the sputtered Pt film modified with a small amount of Au deposit was evaluated by the current density in a potential-sweep voltammogram and a steady-state polarization curve . The apparent current density for methanol oxidation based on the geometric area of the electrode was decreased by increasing the Au coverage of the catalyst . In potential-sweep voltammetry, the activity per Pt site exposed to the solution reached a maximum value at 70-80% Au coverage . However, the steady-state activity of the Au-modified Pt catalyst was almost the same as that of the pure Pt film . The XPS measurement showed that the valence band spectrum of the Au-modified Pt catalyst prepared by RF sputtering consists of a linear combination of the spectra observed at pure Pt and Au films .