Scanning Electrochemical Cell Microscopy (SECCM) with Hydrogel Probes: A Theoretical and Experimental Investigation
Qiangqiang Zheng1,2, Jian Zhuang1,2, Jian Wang3,4
1Key Laboratory of Education Ministry for Modern Design Rotor-Bearing System, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
Analytical Chemistry
|August 29, 2025
Summary
This study introduces a novel hydrogel probe for Scanning Electrochemical Cell Microscopy (SECCM), significantly improving stability and reducing sample interaction. This advancement enhances nanoscale imaging and electrochemical characterization capabilities.
Area of Science:
- Electrochemistry
- Materials Science
- Nanotechnology
Background:
- Scanning Electrochemical Cell Microscopy (SECCM) enables simultaneous nanoscale morphology and electrochemical measurements.
- Traditional liquid probes in SECCM face challenges like evaporation, residue, and droplet deformation.
Purpose of the Study:
- To introduce and evaluate a novel hydrogel-based SECCM probe.
- To demonstrate the superiority of hydrogel probes over conventional liquid probes.
Main Methods:
- Theoretical analysis using finite element simulations.
- Experimental validation of hydrogel probe performance in SECCM.
- Application of the hydrogel probe for characterizing Au/ITO interfaces.
Main Results:
- Hydrogel probes significantly reduce probe-sample contact area and retraction distance.
- Enhanced stability and efficiency observed in SECCM imaging with hydrogel probes.
- Successful concurrent acquisition of localized morphological and electrochemical data on Au/ITO interfaces.
Conclusions:
- Hydrogel probes offer a superior alternative to liquid probes for SECCM applications.
- The developed hydrogel probe is feasible for standard SECCM measurements.
- This work provides a valuable reference for hydrogel probe development in SECCM research.
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