Surfactant Removal for Colloidal Nanocrystal Catalysts Mediated by N-Heterocyclic Carbenes
Surfactant Removal for Colloidal Nanocrystal Catalysts Mediated by N-Heterocyclic Carbenes
复制标题
DOI：
10.1021/jacs.0c12278
复制
发表时间：
2021-02-11
影响因子：
15
通讯作者：
Zhang, Sen
中科院分区：
文献类型：
--
作者：
Godbold, Perrin;Johnson, Grayson;Zhang, Sen
我们报道了通过与N-杂环卡宾（NHCs）的配体交换从胶体合成的纳米晶体中轻松去除表面活性剂。随后在酸中的NHC配体的质子化有效地清洁纳米晶体的表面，同时保持其均匀的形态和结构用于催化。使用单分散Pt、Pd和Au纳米晶体验证了该策略的广泛功效，所述纳米晶体各自用强结合的膦稳定剂制备。表面活化的纳米晶体表现出显着改善的催化活性，上级的那些获得与其他表面清洁方法，证明在两个中心重要的电化学反应（甘油氧化和CO2还原）。这项工作突出了一种新的表面活化策略，用于催化和其他应用，使胶体化学制备的定义明确的生物库的有效利用成为可能。
We report the facile removal of surfactants from colloidally synthesized nanocrystals via ligand exchange with N-heterocyclic carbenes (NHCs). Subsequent protonation of the NHC ligands in acid efficiently cleans the nanocrystals' surface while preserving their uniform morphology and structure for catalysis. The broad efficacy of this strategy is validated using monodisperse Pt, Pd, and Au nanocrystals, each prepared with strongly bound phosphine stabilizers. The surface-activated nanocrystals exhibit significantly improved catalytic activities, superior to those obtained with other surface cleaning methods, as demonstrated in two centrally important electrochemical reactions (glycerol oxidation and CO2 reduction). This work highlights a new surface activation strategy for catalysis and other applications that enables the efficient use of well-defined nanocrystal libraries prepared by colloidal chemistry.