Decrease of Pt Usage for PEFCs with Highly Active and Durable Pt Shell-Pd Core Structured Catalyst
2017 Volume 42 Issue 2 Pages 83-88
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2017 Volume 42 Issue 2 Pages 83-88
Carbon supported Pt shell-Pd core structured catalyst (Pt/Pd/C) was successfully synthesized via a modified Cu under potential deposition/Pt displacement method. It was found that the Pd core preferentially dissolved out and the Pt shell was rearranged and thickened by a potential cycling performed at 80°C, which enhanced activity of the catalyst for oxygen reduction reaction (ORR). We developed Cu-O2 chemical treatment method which mimics the potential cycling and is suitable for a mass production of highly active Pt/Pd/C catalyst. Furthermore, SiO2 and carbon protective coatings were formed to mitigate agglomeration of the catalyst nanoparticles and improve durability of the catalyst. The highly activated and durable Pt/Pd/C catalyst could be a promising candidate for decrease of Pt usage for polymer electrolyte fuel cells (PEFCs).
