ECS Journal of Solid State Science and Technology ( IF 2.2 ) Pub Date : 2020-11-17 , DOI: 10.1149/2162-8777/abc80d Yanlong Ma 1 , Hua Lin 2, 3 , Yi Liao 4
Noble metal nanoparticles, usually dispersed in a mesoporous support, have widespread applications. However, uploading nanoparticles into mesoporous materials and preventing the nanoparticles from aggregation during the fabrication and application processes remain major challenges. Herein, we report a novel, simple and low-cost method for fabrication of Pt-nanoparticle-loaded mesoporous alumina coating through anodizing of an Al-Pt alloy (98.5 at% Al and 1.5 at% Pt) prepared by magnetron sputtering. It was found that the Al-Pt alloy could be effectively anodized at voltages between 2.8 and 4.5 V (SCE), in 0.4 M sulfuric acid solution, at room temperature. The anodizing processes resulted in Pt-nanoparticles of 5∼50 nm dimensions uniformly-dispersed in the porous anodic alumina film. The proposed method can be implemented on a large scale and extended to other alloy systems consisting of a valve metal and different alloying elements with Gibbs free energy of oxide formation less negative than that of the valve metal.
中文翻译:
通过对Al-Pt合金进行阳极氧化来制备负载Pt纳米粒子的介孔氧化铝涂层
通常分散在中孔载体中的贵金属纳米颗粒具有广泛的应用。然而,将纳米颗粒上传到介孔材料中并防止纳米颗粒在制造和应用过程中聚集仍然是主要挑战。本文中,我们报告了一种新颖,简单且低成本的方法,该方法通过对磁控溅射制备的Al-Pt合金(98.5 at%的Al和1.5 at%的Pt)进行阳极氧化来制造负载Pt纳米粒子的介孔氧化铝涂层。发现在室温下,在0.4 M硫酸溶液中,可以在2.8至4.5 V(SCE)的电压下对Al-Pt合金进行有效的阳极氧化。阳极氧化过程使5-50 nm尺寸的Pt纳米颗粒均匀分散在多孔阳极氧化铝膜中。