ELECTROACTIVITY OF PLATINUM ALLOY NANOCLUSTERS-CATALYST ELECTRODES PREPARED BY ELECTROCHEMICAL DEPOSITION ON CARBON SUPPORTS

摘要

The electrochemical deposition of Pt nanoparticles on carbon nanotubes (CNTs) supports and their electro-catalytic activities, were investigated. Pt catalysts of 4-12 nm average crystalline size were grown on supports by sweep-potential methods. Electro-plating of 24 min time by sweep-potential method was sufficient to obtain small crystalline size 6.2 nm particles, showing a good electrochemical activity. The catalysts' loading contents were enhanced by increasing the deposition time. The crystalline sizes and structures of the Pt/support catalysts were evaluated using X-ray diffraction (XRD). The electrochemical behaviors of the Pt/support catalysts were investigated according to their characteristic current-voltage curves in a methanol solution. In the result, the electrochemical activity increased with increased plating time, reaching the maximum at 24 min, and then decreased.