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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
Ionic liquids as electrolytes for the development of a robust amperometric oxygen sensor
Zhe Wang1, Peiling Lin, Gary A Baker
1Department of Chemistry, Oakland University, Rochester, Michigan 48309, United States.
Analytical Chemistry
|August 19, 2011
Summary
This study introduces an improved Clark-type electrochemical sensor using ionic liquids (IL) for oxygen detection. The novel design offers enhanced performance, stability, and a low detection limit for long-term online monitoring applications.
Area of Science:
- Electrochemistry
- Analytical Chemistry
- Materials Science
Background:
- Conventional Clark-type sensors face limitations in stability and performance.
- Ionic liquids (ILs) offer unique properties like thermal stability and low volatility.
- Developing robust sensors for online gas analysis is crucial for various industrial and environmental applications.
Purpose of the Study:
- To develop and evaluate a modified Clark-type electrochemical cell for amperometric oxygen sensing.
- To investigate the influence of different ionic liquid cations on sensor performance.
- To demonstrate the long-term stability and analytical capabilities of the IL-based sensor.
Main Methods:
- Fabrication of a Clark-type electrochemical cell with a platinum gauze working electrode.
- Utilization of ionic liquids (ILs) with bis(trifluoromethylsulfonyl)imide anion as electrolytes.
- Amperometric detection of oxygen and characterization of analytical parameters (LOD, linearity, response time).
- Evaluation of sensor stability and electrode fouling over 90 days.
Main Results:
- The IL-based sensor demonstrated a low limit of detection (0.05 vol%) and wide linearity (0-20% oxygen partial pressure).
- A steady-state response time of 2 minutes was achieved.
- The sensor exhibited stable analytical response for 90 days with no significant electrode fouling.
- Performance was significantly improved compared to conventional aqueous electrolyte-based sensors.
Conclusions:
- Ionic liquids provide a superior electrolyte medium for Clark-type oxygen sensors, enhancing performance and stability.
- The developed sensor is suitable for long-term online monitoring and harsh conditions due to ILs' thermal stability.
- The sensor design shows potential for adaptation to detect other gases like methane and nitric oxide.
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