Abstract
We report one-step synthesis of Pd-rich carbon-supported Pd-Pt alloy electrocatalysts of different Pd/Pt atomic ratios with and without the addition of trisodium citrate as the complexing agent and stabilizer. An activity comparison of the oxygen reduction reaction (ORR) on the Pd-Pt/C catalysts with the same fcc structure and a similar particle size has been investigated. The Pd3Pt1/C catalyst exhibits the highest ORR activity among all the alloy catalysts prepared with the addition of trisodium citrate and a comparative ORR activity with the Pt/C. However, the Pd3Pt1/C catalyst prepared without the addition of trisodium citrate shows an enhanced ORR activity in comparison with the Pt/C. All the bimetallic catalysts exhibited much higher methanol tolerance during the ORR than the Pt/C catalyst. The high methanol tolerance of the Pd-Pt/C alloy catalysts during the ORR may be ascribed to a composition effect and to the formation of Pd-based alloys.
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