One-Pot Synthesis of Pt–Pd Bimetallic Nanodendrites with Enhanced Electrocatalytic Activity for Oxygen Reduction Reaction
2019
Wu, Rifeng | Li, Yanjie | Gong, Wenhao | Shen, Pei Kang
One-pot synthesis Pt–Pd bimetallic nanostructure has become a promising way to get superior oxygen reduction reaction performance and cost-effective electrocatalyst for proton exchange membrane fuel cells. In this work, we report a facile one-pot method by tuning the feed ratio of Pt and Pd (Pt₃Pd₁, Pt₂Pd₁, and Pt₁Pd₁) in ethylene glycol solution at the effect of iodide ions and poly(vinylpyrrolidone) to synthesize three different Pt–Pd bimetallic nanodendrites structure. Transmission electron microscopy and high-resolution transmission electron microscopy revealed that the nanodendrites have a Pt-rich surface structure and numerous high-index facets at the branch’s surface, thus providing a great deal of catalytic sites. Carbon-supported Pt–Pd nanodendrite catalysts were investigated for oxygen reduction reaction performance and accelerated durability test. The Pt₁Pd₁/C catalyst shows the best activity and durability and with a mass activity of 1.164 A mgPₜ–¹ and a specific activity of 1.33 mA cm–², greatly enhanced compared with commercial TKK-Pt/C catalysts (0.15 A mgPₜ–¹ for mass activity, and 0.25 mA cm–² for a specific activity). The Pt₁Pd₁/C catalyst also exhibits remarkable durability with almost negligible decay in performance after 10 000 cycles. These results provide us an attractive strategy for designing catalysts with a simple route, lower cost, and remarkable catalytic activity and durability.
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