一氧化碳辅助钯、铂纳米晶的形貌控制

Abstract

Shape control of noble metal nanocrystals is important to tune their catalytic and optical properties. In the past years, during the development of strategies to shape control of Pt and Pd nanocrystals, CO has been demonstrated to serve as not only an excellent reducing agent for the synthesis of Pt and Pd nanocrystals, but also an adsorbate that can selectively bind on specific facets of Pt and Pd to facilitate the shape control. The method to use CO for the shape control of Pt and Pd nanocrystals has its unique advantage. Through the method, some unique nanocrystals that were not prepared by other synthetic strategies have been successfully synthesized. In this review, the adsorption behaviors of CO on single-crystalline Pt and Pd surface are discussed from the viewpoint of surface science to point out their difference. Several examples of CO-assisted shape control of Pt and Pd nanocrystals (i.e., ultrathin Pd nanosheets, mesocrystalline Pd nanocorolla, Pd tetrapods/tetrahedra, Pt nanocubes, and Pt3Co truncated octahedra) are summarized and the mechanism how CO controls their shape was discussed. Finally, conclusions and prospects are given to pose the challenges of CO-assisted shape control of Pd and Pt nanocrystals.