Battery Electrode Materials with Omnivalent Cation Storage for Fast and Charge‐Efficient Ion Removal of Asymmetric Capacitive Deionization
By Seungyeon Choi, Barsa Chang, Seoni Kim, Jiho Lee, Jeyong Yoon, J. Choi. Advanced Functional Materials, 2018
139 citations recorded by the source corpus.
Capacitive deionization (CDI) that engages porous carbon electrodes constitutes one of the well‐established energy‐efficient desalination methods. However, improvement in desalination performance, including ion removal capacity, ion removal rate, and charge efficiency remains requisite for a wide range of applications. Herein, an ion‐exchange membrane‐free asymmetric CDI is introduced by pairing a metal organic framework (MOF), namely, K0.03Cu[Fe(CN)6]0.65·0.43H2O and porous carbon. The exclusive intercalation of cations into the MOF prevents the reverse adsorption of co‐ions (anions), thus significantly improving ion removal capacity (23.2 mg g−1) and charge efficiency (75.8%). Moreover, by utilizing the advantage of the MOF that diverse mono‐ and divalent cations can be stored in the narrow redox potential range, the asymmetric CDI allows simultaneous capture of mono‐ and divalent cations, thus achieving omnivalent cation removal. Moreover, cations are intercalated in the hydrated forms without a discrete phase transition of the host structure, facilitating rapid desalination by reducing the desolvation energy penalty, which results in a high ion removal rate of 0.24 mg g−1 s−1. This study offers a new design principle in CDI: the integration of a crystal structure with large ionic channels that enable hydrated intercalation of multivalent ions in a fast and exclusive manner.
Subfields: Biomedical Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/1e3275fbb442765dea58279ee3fdc8fdbf7e766b
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Citations in the corpus
- Various cell architectures of capacitive deionization: Recent advances and future trends. (2019, background): “Guided by the two goals, we expect that considerable efforts will continue to be dedicated to the development of new electrode and membrane materials that could provide a desirable desalination performance or performance stability, among which construction of cells consisting of asymmetric porous ca”