Solution Synthesis of Cu3PdN Nanocrystals as Ternary Metal Nitride Electrocatalysts for the Oxygen Reduction Reaction

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• 作者：Dimitri D. Vaughn II ; Jose Araujo ; Praveen Meduri ; Juan F. Callejas ; Michael A. Hickner ; Raymond E. Schaak
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：November 11, 2014
• 年：2014
• 卷：26
• 期：21
• 页码：6226-6232
• 全文大小：483K
• ISSN：1520-5002

文摘

The synthesis of transition metal nitride nanoparticles is challenging, in part because the unreactive nature of the most common nitrogen reagents necessitates high-temperature and/or high-pressure reaction conditions. Here we report the solution-phase synthesis and characterization of antiperovskite-type Cu₃PdN nanocrystals that are multifaceted, uniform, and highly dispersible as colloidal solutions. Colloidal Cu₃PdN nanocrystals were synthesized by reacting copper(II) nitrate and palladium(II) acetylacetonate in 1-octadecene with oleylamine at 240 掳C. The Cu₃PdN nanocrystals were evaluated as electrocatalysts for the oxygen reduction reaction (ORR) under alkaline conditions, where both Cu₃N and Pd nanocrystals are known to be active. The ORR activity of the Cu₃PdN nanocrystals appears to be superior to that of Cu₃N and comparable to that of Pd synthesized using similar methods, but with significantly improved mass activity than Pd control samples. The Cu₃PdN nanocrystals also show greater stability than comparably synthesized Pd nanocrystals during repeated cycling under alkaline conditions.