Enhancement of oxygen reduction activity by sequential impregnation of Pt and Pd on carbon support

• Published in: The Korean journal of chemical engineering Vol. 27; no. 6; pp. 1689 - 1694
• Main Authors: Jung, Dohwa, Beak, Sangchul, Nahm, Kee Suk, Kim, Pil
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.11.2010; 한국화학공학회
• Subjects: Biotechnology; Catalysis; Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Materials Science; 화학공학; Pd Catalyst; Pt Catalyst; Bimetallic Catalyst; Oxygen Reduction Reaction (ORR); Polymer Electrolyte Fuel Cells (PEMFCs)
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-010-0292-6

Two Pd-based PtPd bimetallic catalysts (mole ratio of Pt to Pd=1: 18) were prepared by co-impregnation (Pt-Pd/C) and sequential impregnation of Pt on Pd/C [Pt(Pd/C)] for the application to oxygen reduction reaction (ORR). The prepared bimetallic catalysts had lower ORR activities than Pt/C, while they showed largely enhanced activity compared to Pd/C. In particular, the extent of enhancement was found to be dependent on the surface composition. The observed mass and specific activities of Pt(Pd/C) were more than two times higher than those of Pt-Pd/C. The superior activity of Pt(Pd/C) observed from the performed studies was attributed to its Pt-rich surface.