Nanobiointeractions & Nanodiagnostics, Center for Bio-Molecular Nanotechnologies , Istituto Italiano di Tecnologia , Via Barsanti , 73010 Arnesano , Lecce , Italy.
Institute of Electrochemistry , University of Alicante , Apdo. 99 , E-03080 Alicante , Spain.
ACS Appl Mater Interfaces. 2018 Dec 5;10(48):41608-41617. doi: 10.1021/acsami.8b11774. Epub 2018 Nov 20.
The development of green and scalable syntheses for the preparation of size- and shape-controlled metal nanocrystals is of high interest in many areas, including catalysis, electrocatalysis, nanomedicine, and electronics. In this work, a new synthetic approach based on the synergistic action of physical parameters and reagents produces size-tunable octahedral Pt nanocrystals, without the use of catalyst-poisoning reagents and/or difficult-to-remove coatings. The synthesis requires sodium citrate, ascorbic acid, and fine control of the reduction rate in aqueous environment. Pt octahedral nanocrystals with particle size as low as 7 nm and highly developed {111} facets have been achieved, as demonstrated by transmission electron microscopy, X-ray diffraction, and electrochemical methods. The absence of sticky molecules together with the high quality of the surface makes these nanocrystals ideal candidates in electrocatalysis. Notably, 7 nm bismuth-decorated octahedral nanocrystals exhibit superior performance for the electrooxidation of formic acid in terms of both specific and mass activities.
开发绿色且可扩展的方法来制备尺寸和形状可控的金属纳米晶体在许多领域都具有重要意义，包括催化、电催化、纳米医学和电子学。在这项工作中，一种新的合成方法基于物理参数和试剂的协同作用，可在不使用催化剂中毒试剂和/或难以去除的涂层的情况下，制备出尺寸可调的八面体 Pt 纳米晶体。该合成方法需要使用柠檬酸钠、抗坏血酸，并在水相环境中精细控制还原速率。通过透射电子显微镜、X 射线衍射和电化学方法证明，合成得到了粒径低至 7nm 且具有高度发达的 {111} 面的 Pt 八面体纳米晶体。这些纳米晶体中不存在粘性分子，且表面质量很高，使其成为电催化的理想候选材料。值得注意的是，7nm 铋修饰的八面体纳米晶体在甲酸电氧化方面具有优越的比活性和质量活性。
