金属
动力学
化学
催化作用
位阻效应
Atom(片上系统)
配体(生物化学)
光催化
色散(光学)
纳米技术
材料科学
立体化学
有机化学
物理
嵌入式系统
受体
计算机科学
光学
量子力学
生物化学
作者
Shuping Zhang,Dandan Liang,Bing Bai,Xiuming Zhang,Yuemei Li,Jia Liu,Xiuhui Zhang,Jiatao Zhang
标识
DOI:10.1021/acs.jpclett.3c00830
摘要
Cation exchange (CE) under mild conditions promises a facile strategy to anchor single metal sites on colloidal chalcogenides toward catalytic applications, which however has seldom been demonstrated. The dilemma behind this is the rapid kinetics and high efficiency of the reaction disfavoring atomic dispersion of the metal species. Here we report that a fine-tuning of the affinity between the incoming metal cations and the deliberately introduced ligands can be exploited to manipulate the kinetics of the CE reaction, in a quantitative and systematic manner defined by the Tolman electronic parameter of the ligands used. Moreover, the steric effect of metal-ligand complexes offers thermodynamic preference for spatial isolation of the metal atoms. These thereby allow the rational construction of single atom catalysts (SACs) via simple one-step CE reactions, as exemplified by the CE-derived incorporation of single metal atoms (M = Cu, Ag, Au, Pd) on SnS2 two-unit-cell layers through M-S coordination.
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