纳米晶
成核
材料科学
面(心理学)
蚀刻(微加工)
催化作用
溴化物
动力学
结晶学
钯
化学工程
金属
纳米技术
无机化学
化学
图层(电子)
冶金
心理学
社会心理学
生物化学
物理
有机化学
人格
量子力学
工程类
五大性格特征
作者
C. F. Hsieh,Yihong Liu,Chi‐Yen Tsao,Jui‐Tai Lin,Chong‐Chi Chi,Cheng-Chun Chang,Yueh‐Chun Hsiao,C. N. Wu,Tung‐Han Yang
标识
DOI:10.1002/admi.202201036
摘要
Abstract With Pd as an example, a set of quantitative analyses is designed to shed light on the bromide‐mediated reduction kinetics and oxidative etching in determining the twin structure and facet of Pd nanocrystals. The success of this work relies on the kinetic measurements of Pd(II) precursor reduction and the close examinations of resultant Pd seeds and nanocrystals at different stages of synthesis. We observe there is a clear trend where low, moderate, and high initial Pd(II) reduction rates regulated by Br − ions correspond to the formation of Pd seeds with singly‐twinned, multiply‐twinned, and single‐crystal structures in the nucleation stage, respectively. Our quantitative analyses also suggest the oxidative etching induced by oxygen/Br − pair can selectively remove the multiply‐twinned Pd seeds from the products in the growth stage while leaving behind singly‐twinned or single‐crystal Pd seeds for the evolution into Pd nanocrystals with well‐defined facets in high purity. The mechanistic insights obtained in this work can be extended to the synthesis of Pd@Pd−Pt core−shell nanocubes with high‐index facets, which can be used as excellent electrocatalysts and photocatalysts for hydrogen generation.
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