Abstract
Research and development of water purification technology can effectively alleviate the impact of water shortage. Capacitive deionization technology (CDI) is a novel water treatment technology, by applying low voltage, ions in solution are absorbed by electrodes to form double electric layers to remove pollutants in water. Electrode material is the main factor affecting the effect of CDI treatment. At present, the traditional CDI electrodes mainly focus on the research of carbon materials and carbon-based composites materials. However, their low effective specific surface area, complex preparation process and high resistance limit their application in practical wastewater treatment. Mixed metal oxides have become a new hotspot in the research and application of CDI electrode materials due to their excellent electrochemical properties, such as high reactivity, large specific capacitance and strong conductivity. However, there are few articles on its research and application in CDI. Therefore, this paper reviews the latest research progress, existing problems and application development of mixed metal oxide electrodes and their composite electrodes in the context of the types of polymetallic oxides.
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