In situ transmission electron microscopy of lead dendrites and lead ions in aqueous solution.
In situ transmission electron microscopy of lead dendrites and lead ions in aqueous solution.
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DOI：
10.1021/nn3017469
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发表时间：
2012-07-24
期刊：
影响因子：
17.1
通讯作者：
Regan, Brian C.
中科院分区：
文献类型：
--
作者：
White, Edward R.;Singer, Scott B.;Augustyn, Veronica;Hubbard, William A.;Mecklenburg, Matthew;Dunn, Bruce;Regan, Brian C.
关键词：
观察奈米级组装的理想技术，是提供真实的时间内，产物与反应物的原子解析度影像。使用透射电子显微镜（TEM），我们在原位图像的电化学沉积铅从硝酸铅（II）的水溶液。铅沉积物和局部Pb2+浓度都可以可视化。根据电位变化率和电位历史，铅以结构致密层或枝晶形式沉积在阴极上。在这两种情况下，沉积物都可以被去除，并重复该过程。通过多次电镀和剥离循环持续存在的粗糙体一致地使较大的枝晶成核。定量数字图像分析揭示了Pb2+浓度变化、铅沉积速率和通过电化学电池的电流之间的良好相关性。枝晶生长动力学和相关局部离子浓度的实时电子显微镜可以为电池和相关储能技术的功能电化学提供新的见解。
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 (TEM) 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.
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