Chinese Journal of Applied Chemistry ›› 2023, Vol. 40 ›› Issue (9): 1215-1232.DOI: 10.19894/j.issn.1000-0518.230142

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Research Progress in Design and Application of Transition Metal Electrode for Capacitive Deionization

Si-Yang XING1,2, Fei YU3, Jie MA1,2()   

  1. 1.Research Center for Environmental Functional Materials,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China
    2.School of Civil Engineering,Kashi University,Kashi 844008,China
    3.College of Marine Ecology and Environment,Ocean University,Shanghai 201306,China
  • Received:2023-05-15 Accepted:2023-06-27 Published:2023-09-01 Online:2023-09-14
  • Contact: Jie MA
  • About author:jma@tongji.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22276137)

Abstract:

Capacitive deionization (CDI), an emerging method for water desalination and ion separation, has received much attention due to its advantages of high ion selectivity, high water recovery and low energy consumption. Compared with the traditional carbon electrodes, the emerging Faraday electrode offers a unique opportunity to make the desalination performance of CDI significantly improved through the Faraday reaction of ion capture. Transition metal-based electrodes have received much attention in the field of CDI electrode design due to their highly reversible Faraday response, relatively high conductivity, and excellent theoretical pseudocapacitance values. In this paper, we systematically summarize and sort out the material classification of transition metal-based electrodes in CDI applications, and summarize the modification engineering performed for their intrinsic defects, mainly including conductive material coupling, functional architecture engineering and defect engineering, etc., and summarize their performance in CDI applications; in addition, the specific applications of transition metal-based electrodes in CDI are particularly introduced in terms of ion selective separation, metal ion removal and nutrient element recovery. Finally, the paper also outlines the remaining challenges and research directions to provide guidance for future development and research of transition metal chemical substance electrodes.

Key words: Capacitive deionization, Desalination, Transition metals, Electrode design, Ion adsorption

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