期刊
ACS NANO
卷 6, 期 7, 页码 6308-6317出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn3017469
关键词
scanning transmission electron microscopy; STEM; in situ TEM; electron microscopy in liquid; dendrites; ions; water
类别
资金
- American Chemical Society
- NIH [1S10RR23057]
- CNSI at UCLA
- NSF [DMR 0748880]
- Office of Naval Research
- Direct For Mathematical & Physical Scien [0748880, 1206849] Funding Source: National Science Foundation
- Division Of Materials Research [0748880, 1206849] Funding Source: National Science Foundation
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.
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