Enhanced Desalination Performance By Mixed Capacitive Faradaic Charge Storage Using Ruthenium Oxide-activated Carbon Composite Electrodes

The shortage of the water resource has been more and more severe.Capacitance deionization technology due to its efficiency and environmental friendness has been paid more and more attention.The principle of CDI is based on the capacitor,charge adsorption under the applied electric field force in order to realize the deionization.The traditional capacitor is Double-layer capacitor based on physical absorption,limited by the electrode materials.Pseudocapacitance through Faradaic reaction to transfer electron has become a research hotspot.This research combine the double-layer capacitance and pseudocapacitance,in order to build the Mixed composited electrochemical system.Mixed capacitive faradaic charge storge using ruthenium oxide-activated carbon composite electrodes.The characteristic of the composite material istested by structural morphology and electrochemical measurements.As demonstrated,the RuO2(20)-AC electrode presented favorable capacitive characteristics with salt adsorption capacity of 11.26(mg/g),which was much higher than that of AC electrodes(3.04(mg/g)),The higher salt adsorption capacity of the RuO2(20)-AC electrode could be attributed to the double-layer charging of RuO2 from the Faradaic reaction.This study can be of interest to researches in the design of ideal CDI electrode materials for improving desalination performance.