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Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

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Ultramicroelectrode fabrication guidelines for multifunctional scanning electrochemical microscopy.

Congshan Guo1,2,3,4, Zhizhen Lv1,2,3,4, Jigui Tang1,2,3,4

  • 1College of Energy, Soochow University, Suzhou, 215006, China. jshui@suda.edu.cn.

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Researchers developed a scalable method to create high-performance metal disk ultramicroelectrodes (UMEs) for scanning electrochemical microscopy (SECM). These precise probes enable advanced studies in electrocatalysis and energy storage.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Scanning electrochemical microscopy (SECM) requires high-performance probes for detailed interfacial analysis.
  • Fabricating ultramicroelectrodes (UMEs) with controlled geometries is challenging but crucial for advanced SECM applications.

Purpose of the Study:

  • To develop a scalable and versatile protocol for fabricating high-performance metal disk UMEs for multifunctional SECM.
  • To achieve precise control over probe morphology, including RG values and interelectrode gaps.

Main Methods:

  • Utilized a thick-wall nanopipette template integrated with tip forging.
  • Fabricated dual-disk electrodes (DDE) with RG values <1.1 and interelectrode gaps of 5-10 μm.
  • Achieved a reproducible method with a success rate of >95% across large batches.

Main Results:

  • Demonstrated simultaneous O2 and pH monitoring during water oxidation catalysis.
  • Showcased in situ mapping of lithium-ion flux during lithium plating.
  • Successfully produced sensitive, multifunctional SECM probes with high reproducibility.

Conclusions:

  • Established a reliable platform for producing advanced SECM probes.
  • Significantly advanced quantitative investigation of complex interfacial chemical processes.
  • Provided a versatile tool for electrocatalysis and energy storage research.