Optimizing the fabrication of carbon nanotube electrode for effective
capacitive deionization via electrophoretic deposition strategy |
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Authors: | Simeng Zhang Yue Wang Xinyu Han Yanmeng Cai and Shichang Xu |
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Affiliation: | 1. Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2. Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, China;3. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China |
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Abstract: | In order to obtain superior electrode performances in capacitive deionization (CDI), the electrophoretic deposition (EPD) was introduced as a novel strategy for the fabrication of carbon nanotube (CNT) electrode. Preparation parameters, including the concentration of slurry components, deposition time and electric field intensity, were mainly investigated and optimized in terms of electrochemical characteristic and desalination performance of the deposited CNT electrode. The SEM image shows that the CNT material was deposited homogeneously on the current collector and a non-crack surface of the electrode was obtained. An optimal preparation condition of the deposited CNT electrode was obtained and specified as the Al (NO3)3 M concentration of 1.3?×?10?2 mol/L, the deposition time of 30?min and the electric field intensity of 15?V/cm. The obtained electrode performs an increasing specific mass capacitance of 33.36?F/g and specific adsorption capacity of 23.93?mg/g, which are 1.62 and 1.85 times those of the coated electrode respectively. The good performance of the deposited CNT electrode indicates the promising application of the EPD methodology in subsequent research and fabrication of the CDI electrodes for CDI process. |
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Keywords: | CDI Capacitive deionization EPD Electrophoretic deposition CNT Deposited carbon nanotube MWCNTs Multi-walled carbon nanotubes CV Cyclic voltammetry EIS Electrical impedance spectroscopy Carbon nanotube Water treatment Desalination Capacitive deionization Electrode fabrication Electrophoretic deposition |
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