Principles for Optimal Electrode Design and Operation for Desalination with Electrochemical Ion Pumping
Weifan Liu, Longqian Xu, Shihong Lin
TL;DR
This paper explores how to design and operate electrodes for efficient desalination using electrochemical ion pumping.
Contribution
The study provides systematic principles for optimizing electrode design and operation in electrochemical ion pumping.
Findings
Optimal performance requires balancing ion mobility through the polymer phase and electronic conductivity from the carbon phase.
Desalination performance remains stable over a wide range of electrode capacity but declines at very low capacity.
EIP's specific energy consumption is consistent across different cycle times if electrolysis is prevented.
Abstract
Electrochemical ion pumping (EIP) is an emerging electrochemical separation form that eliminates solution mixing in conventional capacitive deionization and enables pseudocontinuous desalination with unidirectional ion flux. In this work, we systematically investigate electrode design and operational parameters governing the performance of EIP desalination using both experiments and modeling. We first evaluated the effect of carbon and polymer fractions on ionic and electronic transport within the cation-shuttling electrodes, demonstrating that optimal performance requires balancing ion mobility through the polymer phase and the electronic conductivity and ion storage capacity provided by the carbon phase. We then assessed the impact of electrode capacity and conductivity on EIP performance by varying the ratio of activated carbon and carbon black, showing that desalination performance…
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Taxonomy
TopicsMembrane-based Ion Separation Techniques · Membrane Separation Technologies · Fuel Cells and Related Materials