Vulcan-Supported Pt Electrocatalysts for PEMFCs Prepared using Supercritical Carbon Dioxide Deposition

Bayrakceken A., Smirnova A., Kitkamthorn U., Aindow M., Tuerker L., Eroglu I., ...Daha Fazla

CHEMICAL ENGINEERING COMMUNICATIONS, cilt.196, ss.194-203, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 196
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1080/00986440802290110
  • Dergi Adı: CHEMICAL ENGINEERING COMMUNICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.194-203
  • Anahtar Kelimeler: Carbon black, Pt nanoparticles, Supercritical carbon dioxide deposition, PLATINUM NANOPARTICLES, AEROGEL NANOCOMPOSITES, PT/C CATALYSTS, FUEL, METHANOL, NANOTUBES, ELECTRODES, OXIDATION, SURFACE, CATHODE
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

In this study, supercritical carbon dioxide (scCO(2)) deposition was used to prepare vulcan-supported Pt (Pt/Vulcan) electrocatalysts for proton exchange membrane fuel cells (PEMFCs), and the effects of process variables on the properties of the electrocatalysts were investigated. The two different methods used to reduce the organometallic precursor were thermal reduction in nitrogen at atmospheric pressure and thermal reduction in scCO(2). In the former method, the maximum Pt loading achieved was 9%, and this was governed by the adsorption isotherm of the Pt precursor between the scCO(2) phase and the Vulcan phase. By using the latter method, higher Pt loadings of 15% and 35% could be achieved. The Pt/Vulcan catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and cyclic voltammetry (CV). The average particle sizes for Pt/Vulcan 9%, 15%, and 35% catalysts were 1.2, 1.3, and 2nm, respectively. Electrochemical surface areas obtained from CV data were found to vary with the Pt loading.