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Electrodeposition

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...

Potentiometry: Types of Electrodes

Potentiometry: Types of Electrodes

Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...

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Updated: Sep 13, 2025

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Good Readings Come in Threes: Understanding Electrodeposited Iridium Oxide for a Reproducible pH Microsensor

Changyue Du¹, Hu Zhou¹, Samantha Jee¹

¹Department of Chemistry, McGill University, Montréal, QC H3A 0B8, Canada.

Analytical Chemistry

|July 31, 2025

Summary

Reproducibility issues in iridium oxide pH microsensors stem from a lack of understanding in their chemistry. Addressing solution, electrodeposition, and storage chemistry improves sensor performance and stability.

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Area of Science:

Electrochemistry
Materials Science
Sensor Technology

Background:

Electrodeposited iridium oxide is a recognized material for pH sensing, offering a wide range, rapid response, and stability.
Limited understanding of the underlying solution, electrodeposition, and storage chemistry hinders the reproducibility of iridium oxide-based pH microsensors.

Purpose of the Study:

To investigate the solution chemistry, electrodeposition chemistry, and storage chemistry of iridium oxide films for pH microsensors.
To identify factors affecting deposition efficiency, film geometry, and sensor drift.
To explore methods for improving the stability and reproducibility of these sensors.

Main Methods:

Analysis of solution chemistry to identify optimal deposition precursors.
Controlled electrodeposition experiments varying potential to influence film morphology.
Investigation of film storage conditions and their impact on sensor performance.
Application of laser-induced localized annealing to mitigate degradation.

Main Results:

High deposition efficiency is linked to a high concentration of multi-Ir(IV)-center oligomers in solution.
Lower electrodeposition potentials facilitate geometrical confinement of iridium oxide films on microelectrodes.
Degradation of iridium complexes during storage causes time-dependent pH reading drift.
Laser-induced localized annealing effectively reduces pH reading drift.

Conclusions:

Fundamental understanding of iridium oxide chemistry is crucial for reproducible pH microsensor fabrication.
Optimizing electrodeposition and storage conditions can enhance sensor performance.
Laser annealing presents a promising technique for stabilizing iridium oxide microsensors and enabling advanced fabrication.