Abstract
Carbon-supported Pt and Pd ( metal) were employed as oxygen reduction catalysts in NaOH solutions. Results from X-ray diffraction analysis show that the metals are in the form of Pt face-centered cubic (fcc) and Pd (fcc) crystal only. The metal particles were observed to distribute uniformly on carbon supports, and the average particle size of the Pd and the Pt was 3.1 and , respectively, from the transmission electron microscopy image analysis. The catalyst showed high activity toward the oxygen reduction reaction (ORR) both at room and elevated temperatures (up to ) compared with the . The activation energies for the ORR on the are slightly lower than that on the (39 vs at the overpotential of ). The four-electron path is dominant on both the and the . The yields on both catalysts are analyzed in detail. As a cathode fuel cell catalyst, the catalyst is less sensitive to alcohol contamination as compared to . The challenges for using as an ORR catalyst in alkaline solutions are also discussed in this paper.
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