In Situ Transmission Electron Microscopy of Lead Dendrites and Lead Ions in Aqueous Solution

被引：154

作者：

White, Edward R. ^{[1
,2
]}

Singer, Scott B. ^{[1
,2
]}

Augustyn, Veronica ^{[2
,3
]}

Hubbard, William A. ^{[1
,2
]}

Mecklenburg, Matthew ^{[1
,2
]}

Dunn, Bruce ^{[2
,3
]}

Regan, Brian C. ^{[1
,2
]}

机构：

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[2] Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USA

[3] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

来源：

ACS NANO | 2012年 / 6卷 / 07期

基金：

美国国家科学基金会;

关键词：

scanning transmission electron microscopy; STEM; in situ TEM; electron microscopy in liquid; dendrites; ions; water; GROWTH; ELECTRODEPOSITION; DIFFUSION; TRANSPORT; DYNAMICS;

D O I：

10.1021/nn3017469

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

An ideal technique for observing nanoscale assembly would provide atomic-resolution images of both the products and the reactants in real time. Using a transmission electron microscope we image in situ the electrochemical deposition of lead from an aqueous solution of lead(II) nitrate. Both the lead deposits and the local Pb2+ concentration can be visualized. Depending on the rate of potential change and the potential history, lead deposits on the cathode in a structurally compact layer or in dendrites. In both cases the deposits can be removed and the process repeated. Asperities that persist through many plating and stripping cycles consistently nucleate larger dendrites. Quantitative digital image analysis reveals excellent correlation between changes in the Pb2+ concentration, the rate of lead deposition, and the current passed by the electrochemical cell. Real-time electron microscopy of dendritic growth dynamics and the associated local ionic concentrations can provide new insight into the functional electrochemistry of batteries and related energy storage technologies.

引用

页码：6308 / 6317

页数：10

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