Huang Da-Bing, He Pei-Lei, Yuan Qiang, Wang Xun
College of Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou province 550025 (P.R. China).
Chem Asian J. 2015 Mar;10(3):608-13. doi: 10.1002/asia.201403310. Epub 2015 Jan 23.
Size-controllable, high-yield, island-shaped RhPdPt trimetallic nanocrystals with sub-2.0 nm islands have been successfully synthesized through a facile aqueous solution approach. The results of X-ray diffraction (XRD), energy-dispersive X-ray (EDX) line scanning and elemental mapping analysis showed the as-synthesized RhPdPt nanocrystals are alloy structures. These island-shaped RhPdPt trimetallic nanoalloys showed a composition-dependent electrocatalytic performance for ethanol oxidation in alkaline medium. Due to the special structure and intermetallic synergies, the Rh10Pd40Pt50 nanoalloys exhibited an enhanced catalytic activity and durability relative to island-shaped Pd50Pt50 bimetallic nanoalloys and commercial Pt black. The peak current density for Rh10Pd40Pt50 nanoalloys was 1.81 and 1.38 times that for commercial Pt black and Pd50Pt50 nanoalloys, respectively. In addition, the peak potential on Rh10Pd40Pt50 nanoalloys decreased 42 mV relative to commercial Pt black and Pd50Pt50 nanoalloys.
通过一种简便的水溶液方法，成功合成了尺寸可控、高产率、具有亚2.0 nm岛状结构的RhPdPt三金属纳米晶体。X射线衍射（XRD）、能量色散X射线（EDX）线扫描和元素映射分析结果表明，所合成的RhPdPt纳米晶体为合金结构。这些岛状RhPdPt三金属纳米合金在碱性介质中对乙醇氧化表现出与成分相关的电催化性能。由于特殊的结构和金属间协同作用，相对于岛状Pd50Pt50双金属纳米合金和商业铂黑，Rh10Pd40Pt50纳米合金表现出增强的催化活性和耐久性。Rh10Pd40Pt50纳米合金的峰值电流密度分别是商业铂黑和Pd50Pt50纳米合金的1.81倍和1.38倍。此外，Rh10Pd40Pt50纳米合金上的峰值电位相对于商业铂黑和Pd50Pt50纳米合金降低了42 mV。
