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Structural/Compositional-Tailoring of Nickel Hexacyanoferrate Electrodes for Highly Efficient Capacitive
Yang Bao1, Jinxin Hao1, Shu Zhang1
1Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing, 210044, China.
Tailoring nickel hexacyanoferrate (NiHCF) structure enhances its performance in capacitive deionization (CDI) for water desalination. Hierarchically structured NiHCF nanoframe electrodes show superior desalination capacity and ion selectivity.
Area of Science:
- Materials Science
- Electrochemistry
- Environmental Science
Background:
- Prussian blue analogs (PBAs) are vital for electrochemical water desalination.
- Capacitive deionization (CDI) performance relies on electrode material properties.
Purpose of the Study:
- To investigate how structural and compositional modifications of PBAs, specifically nickel hexacyanoferrate (NiHCF), impact CDI performance.
- To evaluate the effectiveness of hierarchically structured NiHCF nanoframe (NiHCF-NF) electrodes and carbon coatings.
Main Methods:
- Synthesized and characterized NiHCF electrodes with varying structures (e.g., nanoframe).
- Coated NiHCF electrodes with carbon films.
- Tested electrode performance in a CDI cell, measuring desalination capacity, charge efficiency, cyclability, and ion selectivity.
Main Results:
- Hierarchically structured NiHCF-NF electrodes achieved a high desalination capacity (121.38 mg g⁻¹), 82% charge efficiency, and 88% capacity retention over 40 cycles.
- Carbon coating on NiHCF reduced desalination capacity due to blocked diffusion pathways.
- NiHCF-NF electrodes exhibited superior selectivity for Na⁺ ions over Ca²⁺ and Mg²⁺ ions.
Conclusions:
- Structural and compositional tailoring of NiHCF is effective for optimizing CDI performance.
- Hierarchical nanostructure design is a promising strategy for advanced desalination electrodes.
- These findings offer insights for designing novel intercalation electrode materials for CDI applications.
