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Stable and Contamination-Resistant Ag/Ag2O Micro-Reference Electrode for Alkaline Scanning Electrochemical Cell
Jiangmei Yuan1, Xiaoqing Chu1, Wenfu Liu1
1School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
Analytical Chemistry
|October 20, 2025
Summary
Researchers developed stable, contamination-resistant micro-reference electrodes (REs) for alkaline environments. These novel REs overcome limitations of conventional designs, enabling reliable electrochemical measurements in miniaturized systems.
Area of Science:
- Electrochemistry
- Materials Science
- Nanotechnology
Background:
- Reliable reference electrodes (REs) are crucial for accurate electrochemical measurements.
- Miniaturization of electrochemical systems necessitates micro-REs for confined cells.
- Challenges exist in fabricating micro-REs with stability and contamination resistance, especially in alkaline media.
Purpose of the Study:
- Investigate failure mechanisms of conventional micro-Ag/AgCl and micro-Ag/Ag2O REs in alkaline electrolytes.
- Develop protected Ag/Ag2O micro-REs to overcome limitations of conventional designs.
- Demonstrate the utility of the developed micro-REs for advanced in situ characterization.
Main Methods:
- Scanning electrochemical cell microscopy (SECCM) was used as a model platform.
- Systematic investigation of micro-RE failure mechanisms in alkaline media.
- Fabrication of protected Ag/Ag2O micro-REs using Nafion coating and polypropylene encapsulation.
Main Results:
- Identified Ag(OH)2- contamination and Ag2O exfoliation as failure modes for conventional micro-REs.
- Developed protected micro-REs exhibiting <0.2 mV/h potential drift and >3 h contamination resistance.
- Successfully probed Fe incorporation effects in β-Co(OH)2 microplatelets at the single-particle level.
Conclusions:
- Established a stable and contamination-resistant micro-RE platform for alkaline environments.
- The developed micro-REs enable reliable electrochemical measurements in miniature electrochemical systems.
- Facilitates advanced in situ characterization techniques for materials science and nanotechnology.
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