Advanced science: battery pseudocapacitor charge storage coupling mechanism paves high speed channel for CDI dechlorination and desalting
capacitive deionization (CDI) technology has the advantages of high efficiency easy regeneration easy maintenance. It has been widely concerned in the fields of desalination ion separation ion recovery. Carbon based electrodes represented by activated carbon have been widely used in the field of capacitive deionization. However the carbon based electrodes dominated by electric double layer adsorption mechanism have some problems such as low desalination capacity poor stability. The new capacitive deionization electrodes based on Faraday mechanism have the advantages of high desalination capacity high charge efficiency no ion repulsion effect become a research hotspot at present. In recent years the research on CDI electrode materials mainly focuses on the desalting electrode materials the removal efficiency of chloride ions by the counter electrode will also restrict affect the overall desalination capacity of the system. Therefore the development of a new type of dechlorination electrode with high desalination capacity fast desalination rate is conducive to the further development of CDI desalination technology. In view of this the team of associate professors of tispex prespex of Shanghai University cooperated to develop a new type of electrode with low energy consumption.
used low solubility AgCl colloid as precursor ti3c2tx / Ag dechlorination electrode materials with different silver loading sizes were synthesized in situ by using the reduction characteristics of ti3c2tx. The battery conversion effect of Ag nanoparticles achieves high dechlorination capacity the pseudo capacitance of ti3c2tx is easy for ion transport. Taking Ag nanoparticles as "bridges" to longitudinally connect 2D lamellar structure ti3c2tx with excellent conductivity a three-dimensional electron transport network is constructed to make up for the poor conductivity of AgCl formed in the desalination process accelerate the electron transfer between the lamellae- The capacitive coupling mechanism can achieve high capacity fast rate low energy consumption. The battery capacitance coupling mechanism proposed in this work provides a new design idea for the development of practical CDI dechlorination electrode. In recent years
Professor Majie's team has been devoted to the application research of capacitive deionization technology in the field of environmental engineering 3@C ）The spinel ferrite ZnFe2O4 was synthesized by chemical coprecipitation method to realize high capacity stable long life desalination (nano lett. 2019 19 823 ESI highly cited environ. SCI. Technol. Lett. 2020 7 118.) from traditional carbon based electrode materials to Faraday electrode materials the performance connotation of capacitive deionization technology have been greatly improved exped. Through the design development of new electrode materials it is of great significance to promote the large-scale application of capacitive deionization technology. In the aspect of membrane electrode assembly the design strategy of "size take all" "alkaline assembly" was adopted to construct all mxene thin film electrode which effectively promoted the design of mxene other two-dimensional lamellar materials electrode its application in capacitive deionization Technology (environ. SCI. Technol. 2020 54 4554. J. mater. Chem. A 2020 DOI: 10.1039/d0ta06994a). In order to further exp give full play to the advantages of capacitive deionization technology in the application of water pollution control resource recovery other environmental fields pioneering research on the removal of water pollutants resource recovery of phosphorus in water by capacitive deionization technology was carried out (water res. 2020184 116100 J. mater. Chem. A 2019 7 15999 J. hazard. Mater. 2020 382 121039).
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