Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9760463 | Journal of Power Sources | 2005 | 8 Pages |
Abstract
Platinum/carbon nanotubes (Pt/CNT) electrocatalysts are prepared. The CNTs are pre-treated in order to obtain reactive sites for the adherence of Pt metal particles. The electrocatalysts are characterized by scanning electron micrograph (SEM), transmission electron micrograph (TEM) and X-ray photoelectron spectrum (XPS) measurements. It is found that the catalysts contain both Pt(0) and Pt(IV) species. A high Pt loading of 32.5% on CNTs is obtained when the catalysts are prepared with ethylene glycol and Pt salt. The electrocatalysts are used for the oxygen reduction reaction in polymer electrolyte membrane fuel cells (PEMFCs) and the performance of PEMFC is analyzed with respect to catalyst synthesis and Pt loading. Cyclic voltammetric studies show that the Pt utilization in the fuel-cell electrodes is around 44%. Catalysts obtained with mild nitric acid-treated CNTs give a better performance of 680Â mV at 500Â mAÂ cmâ2 and 600Â mV at 800Â mAÂ cmâ2 than catalysts prepared with ethylene glycol and Pt salt.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
N. Rajalakshmi, Hojin Ryu, M.M. Shaijumon, S. Ramaprabhu,