Liu Xiao-Jing, Cui Chun-Hua, Li Hui-Hui, Lei Yong, Zhuang Tao-Tao, Sun Meng, Arshad Muhammad Nadeem, Albar Hassan A, Sobahi Tariq R, Yu Shu-Hong
Division of Nanomaterials and Chemistry , Hefei National Laboratory for Physical Sciences at Microscale , Collaborative Innovation Center of Suzhou Nano Science and Technology , Department of Chemistry , University of Science and Technology of China , Hefei , Anhui , 230026 , China . Email:
Institute of Physics & IMN MacroNano , Ilmenau University of Technology , Prof. Schmidt-Straße 26 , 98693 Ilmenau , Germany.
Chem Sci. 2015 May 1;6(5):3038-3043. doi: 10.1039/c4sc04037f. Epub 2015 Mar 11.
Hollow alloyed nanoparticles (NPs) represent one kind of promising fuel cell electrocatalyst. However, the formation of single-cavity hollow structures by a dealloying process is quite challenging owing to the random leaching/dissolution of transition metals, surface passivation and the limited diffusion distance of the noble metals. Here we present a facile method to prepare hollow PtPdCu NPs derived from monodisperse alloy NPs by an acetic acid-assisted dealloying process. Here, acetic acid not only acts as a chemical etching agent but also plays an important role in the removal of the residual surfactants for colloidal NPs. Our findings rectify the current knowledge that hollow alloyed NPs cannot be prepared by a dealloying strategy and provide further understanding of the dealloying process in a ternary system. Such unique hollow ternary PtPdCu NPs exhibit outstanding durability and improved catalytic activity toward the oxygen reduction reaction.
中空合金纳米颗粒（NPs）是一种很有前景的燃料电池电催化剂。然而，由于过渡金属的随机浸出/溶解、表面钝化以及贵金属的扩散距离有限，通过脱合金化过程形成单腔中空结构颇具挑战性。在此，我们展示了一种简便的方法，通过乙酸辅助脱合金化过程，从单分散合金纳米颗粒制备中空PtPdCu纳米颗粒。在此，乙酸不仅作为化学蚀刻剂，还在去除胶体纳米颗粒的残留表面活性剂方面发挥重要作用。我们的发现纠正了目前关于不能通过脱合金化策略制备中空合金纳米颗粒的认识，并进一步加深了对三元体系中脱合金化过程的理解。这种独特的中空三元PtPdCu纳米颗粒对氧还原反应表现出出色的耐久性和提高的催化活性。
