Anions-capture materials for electrochemical electrode deionization: Mechanism, performance, and development prospects

Xiumei Ma, Wei (Alex) Wang, Lupeng Zhang, Qinghao Wu, Shanfu Lu, Doron Aurbach, Yan Xiang

Research output: Contribution to journalReview articlepeer-review

18 Scopus citations

Abstract

Desalination is a critical process to resolve the crisis of insufficient freshwater resources. Among desalination technologies, electrochemical electrode deionization (EEDI) has attracted wide attention because of the advantages in low cost, no secondary pollution, and low energy consumption etc. Electrode materials are the critical factors for determining the performance of EEDI. However, the traditional EEDI with carbon electrode (capacitive deionization, CDI) often showed inefficient desalination capacity, charge efficiency, cycle stability as well as ions selectivity due to the anode oxidation. Therefore, the development of anions-capture materials is crucial for the development of EEDI devices. In this review, the anions-capture materials are classified into four categories according to their capture mechanisms: (i) Electrosorption materials, mainly including conventional and modified carbon materials; (ii) conversion reaction materials, mainly including Ag/AgCl and Bi/BiOCl couples; (iii) redox reactions materials including polypyrrole (PPY), poly (2,2,6,6-tetramethylpiperidinyloxy methacrylate) (PTMA) and poly (vinylferrocene) (PVFc); (iv) ions intercalation materials including layered double hydroxides/layered metal oxides (LDHs/LMOs), Mxenes. This review summarizes all currently known anions-capture materials and discussing their mechanisms and performance in detail. Future research focus and other vital issues that need to be addressed are also outlined.

Original languageEnglish
Article number115336
JournalDesalination
Volume520
DOIs
StatePublished - 15 Dec 2021

Bibliographical note

Publisher Copyright:
© 2021

Funding

This work was supported by the National Natural Science Foundation of China ( 51761145047 ) and the Fundamental Research Funds for the Central Universities.

FundersFunder number
National Natural Science Foundation of China51761145047
Fundamental Research Funds for the Central Universities

    Keywords

    • Anions-capture materials
    • Anode
    • Capacitive deionization
    • Desalination
    • Electrochemical electrode deionization

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