ポリアクリル酸ナトリウムで保護されたPtコロイドより調製した炭素担持Pt触媒のキャラクタリゼーション

概要

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Colloidal Pt nanoparticles, which contained 23% tetrahedral particles, 8% cubic particles, 49% other polyhedral particles, and 20% unidentified particles, were prepared through the reduction of Pt cations by dissolved H_2 in the presence of sodium polyacrylate (SPA). The Pt particles were supported on carbon black and heated at 260℃ in N_2 flow. The prepared catalyst (Pt/C-SPA) contained 18% tetrahedral particles, 5% cubic particles, 29% other polyhedral particles, and 48% unidentified particles. Although the mean Pt particle size of Pt/C-SPA estimated by transmission electron microscopy (TEM) (9.1 nm) was larger than that of a conventional electrocatalyst (Pt/C-ref) (2.4 nm) for oxygen reduction reaction (ORR), the specific activities of Pt/C-SPA for ORR based on the particle size measured from the TEM image and on its electrochemical surface area were 1.8 and 1.6 times as high as those of Pt/C-ref, respectively.
2003-05-01