Institute of Functional Nano & Soft Materials Laboratory (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China.
College of Chemistry and Environment, Fujian Province Key Laboratory of Morden Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, 363000, P. R. China.
Sci Rep. 2017 Jul 24;7(1):6347. doi: 10.1038/s41598-017-06639-5.
The morphology of Pt-Au bimetal nanostructures plays an important role in enhancing the catalytic capability, catalytic stability and utilization efficiency of the platinum. We designed and successfully prepared Au@Pt nanoparticles (NPs) through an economical, surfactant-free and efficient method of seed-mediated growth. The Au@Pt NPs displayed electrochemical performances superior to those of commercial Pt/C catalysts because their agglomeration was prevented and exhibited better long-term stability with respect to methanol oxidation in acidic media by efficiently removing intermediates. Among the obtained Au@Pt NPs, Au@Pt NPs exhibited the most significantly enhanced catalytic performance for the methanol oxidation reaction (MOR). Their mass and electrochemically active surface area (ECSA)-normalized current densities are approximately 3.9 and 4.6 times higher than those of commercial Pt/C catalysts, respectively. The oxidation current densities of the Au@Pt NPs are approximately 1.8 times higher than those of commercial Pt/C catalysts after 4000 s of continuous measurement because the small Pt NPs grown on the surface of the Au@Pt NPs were effectively stabilized by the Au metal support. This approach may be a facile method for the synthesis of self-supported bimetallic nanostructures, which is of great significance for the development of high performance electrocatalysts and sensors.
Pt-Au 双金属纳米结构的形态在提高铂的催化能力、催化稳定性和利用率方面起着重要作用。我们通过一种经济、无表面活性剂且高效的种子介导生长方法设计并成功制备了 Au@Pt 纳米颗粒（NPs）。Au@Pt NPs 表现出优于商业 Pt/C 催化剂的电化学性能，因为它们可以防止团聚，并通过有效去除中间产物，在酸性介质中对甲醇氧化表现出更好的长期稳定性。在所获得的 Au@Pt NPs 中，Au@Pt NPs 对甲醇氧化反应（MOR）表现出最显著的增强催化性能。它们的质量和电化学活性表面积（ECSA）归一化电流密度分别比商业 Pt/C 催化剂高约 3.9 和 4.6 倍。Au@Pt NPs 的氧化电流密度在连续测量 4000 s 后比商业 Pt/C 催化剂高约 1.8 倍，因为 Au 金属载体有效地稳定了生长在 Au@Pt NPs 表面的小 Pt NPs。这种方法可能是一种制备自支撑双金属纳米结构的简便方法，对于开发高性能电催化剂和传感器具有重要意义。
