氢氧化物
层状结构
材料科学
透射电子显微镜
电化学
化学工程
聚结(物理)
层状双氢氧化物
纳米技术
电极
化学
天体生物学
物理
工程类
物理化学
复合材料
作者
Wenhui Wang,See Wee Chee,Hongwei Yan,Ivan Erofeev,Utkur Mirsaidov
出处
期刊:Nano Letters
[American Chemical Society]
日期:2021-07-13
卷期号:21 (14): 5977-5983
被引量:19
标识
DOI:10.1021/acs.nanolett.1c00898
摘要
Layered double hydroxides (LDHs) are a class of lamellar materials with a wide range of potential catalytic applications. LDHs form from positively charged 2D atomic layers separated by charge-balancing anions and solvent molecules. Typically, nanoscale LDH sheets can grow vertical or parallel to a substrate, exposing their different active facets. These two growth modes of LDH nanosheets have a significant impact on their electrocatalytic properties, yet the details of their growth remain unknown, hindering our ability to design and synthesize high-performance LDH-based electrocatalysts. Here, we investigate the growth pathways of LDH nanosheets using in situ electrochemical liquid-phase transmission electron microscopy (TEM) and show that the growth modes of LDH nanosheets can be controlled by tuning the precursor concentrations. Moreover, our observations reveal that LDH nanosheets grow via two pathways: (1) monomer addition, where the adatoms are heterogeneously deposited onto the LDH nanosheets, and (2) coalescence, where adjacent nanosheets merge together.
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