Pt-based electrocatalysts for polymer electrolyte membrane fuel cells prepared by supercritical deposition technique

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

JOURNAL OF POWER SOURCES, cilt.179, sa.2, ss.532-540, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 179 Sayı: 2
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.jpowsour.2007.12.086
  • Dergi Adı: JOURNAL OF POWER SOURCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.532-540
  • Anahtar Kelimeler: supercritical carbon dioxide deposition, electrocatalyst, carbon, polymer electrolyte membrane fuel cell, platinum, PLATINUM-BASED ELECTROCATALYSTS, OXYGEN REDUCTION REACTION, SUPPORTED CATALYSTS, CARBON NANOTUBES, ELECTROCHEMICAL REDUCTION, AEROGEL NANOCOMPOSITES, NANOPARTICLES, PERFORMANCE, METHANOL, CATHODE
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Pt-based electrocatalysts were prepared on different carbon supports which are multiwall carbon nanotubes (MWCNTs), Vulcan XC 72R (VXR) and black pearl 2000 (BP2000) using a supercritical carbon dioxide (ScCO2) deposition technique. These catalysts were characterized by using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and cyclic voltammetry (CV). XRD and HRTEM results demonstrated that the ScCO2 deposition technique enables a high surface area metal phase to be deposited, with the size of the Pt particles ranging from 1 to 2 nm. The electrochemical surface areas (ESAs) of the prepared electrocatalysts were compared to the surface areas of commercial ETEK Pt/C (10 wt% Pt) and Tanaka Pt/C (46.5 wt% Pt) catalysts. The CV data indicate that the ESAs of the prepared Pt/VXR and Pt/MWCNT catalysts are about three times larger than that of the commercial ETEK catalyst for similar (10 wt% Pt) loadings. Oxygen reduction activity was investigated by hydrodynamic voltammetry. From the slope of Koutecky-Levich plots, the average number of electrons transferred in the oxygen reduction reaction (ORR) was 3.5, 3.6 and 3.7 for Pt/BP2000, Pt/VXR and Pt/MWCNT, correspondingly, which indicated almost complete reduction of oxygen to water. (C) 2008 Published by Elsevier B.V.