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A simulation-based analysis of optical read-out for electrochemical reactions using composite vortex beams
Nirjhar Kumar1, Ankit Arora2, Ananth Krishnan2
1Centre for NEMS & Nanophotonics CNNP and Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India. kr.nirjhar@gmail.com.
Scientific Reports
|September 27, 2024
Summary
We developed a novel optical method to measure faradaic current in electrochemical reactions. This technique uses composite optical vortex beams and measures refractive index changes, offering a sensitive approach for studying reactions.
Area of Science:
- Electrochemistry
- Optics
- Materials Science
Background:
- Electrochemical reactions are crucial in many scientific fields.
- Measuring faradaic current accurately can be challenging, especially in complex systems.
- Existing methods may be affected by non-faradaic processes.
Purpose of the Study:
- To propose and analyze an optical read-out method for extracting faradaic current.
- To investigate the performance of this method using opto-electrochemical (opto-EC) simulations.
- To demonstrate its advantages for studying bulk reactions and low current scenarios.
Main Methods:
- Utilizing structured electrodes to generate composite optical vortex (COV) beams.
- Simulating electrochemical reactions and their effect on refractive index (RI).
- Analyzing the rotation of the COV beam's intensity profile as a measure of RI change.
Main Results:
- The electrochemical reaction induced a measurable RI change, causing COV beam rotation.
- The magnitude of rotation is proportional to the RI change, and the rate correlates with faradaic current density.
- The method is insensitive to non-faradaic interfacial components and effective for low current densities.
Conclusions:
- The proposed optical read-out method offers a sensitive and selective approach for quantifying faradaic current.
- It is advantageous for studying bulk homogeneous reactions and in scenarios with low faradaic current, such as micro-electrode applications.
- This interdisciplinary technique has broad potential applications in energy storage, environmental science, and biomedical fields.
