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Charge and Potential Balancing for Optimized Capacitive Deionization Using Lignin-Derived, Low-Cost Activated Carbon
Rafael Linzmeyer Zornitta1,2, Pattarachai Srimuk1,3, Juhan Lee1,3
1INM-Leibniz Institute for New Materials, 66123, Saarbrücken, Germany.
Chemsuschem
|May 1, 2018
Summary
Lignin-derived carbon shows potential for capacitive deionization (CDI) water desalination. Asymmetric electrode configurations stabilize performance and enhance salt adsorption capacity, making CDI more viable.
Area of Science:
- Materials Science
- Electrochemistry
- Environmental Science
Background:
- Capacitive deionization (CDI) is an emerging technology for water desalination.
- Lignin, a low-cost byproduct of the cellulose and ethanol industries, is explored as a precursor for CDI electrode materials.
- Initial CDI tests with lignin-derived carbon electrodes showed promising but unstable performance.
Purpose of the Study:
- To develop and optimize lignin-derived carbon as a stable and efficient electrode material for CDI.
- To investigate asymmetric electrode configurations for enhancing CDI performance.
- To improve salt adsorption capacity and long-term stability of CDI systems.
Main Methods:
- Lignin precursor was carbonized and KOH-activated to create porous carbon electrodes.
- Symmetric CDI cells with lignin-derived carbon electrodes were tested.
- Asymmetric CDI cells with varying electrode thicknesses and material combinations (lignin-derived carbon and commercial activated carbon) were fabricated and evaluated.
Main Results:
- Symmetric lignin-derived carbon electrodes exhibited initial high salt adsorption but poor stability.
- Asymmetric configurations, particularly using lignin-derived carbon as the negative electrode and activated carbon as the positive electrode, significantly stabilized CDI performance.
- The optimized asymmetric cell achieved a maximum desalination capacity of 18.5 mg/g with over 80% charge efficiency and retained performance over 100 cycles.
Conclusions:
- Asymmetric electrode design is a crucial strategy for stabilizing CDI performance, especially with materials like lignin-derived carbon.
- The difference in the potential of zero charge between electrodes in asymmetric configurations enhances desalination efficiency.
- Lignin-derived carbon, when used in optimized asymmetric CDI cells, presents a cost-effective and high-performance solution for water desalination.
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