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Investigations on electrochemical properties in mass transport of ion exchange membrane
Authors: ZHANG Wenjuan, MA Jun, WANG Zhiwei, LIU Huiling
Units: School of Municipal and Environmental Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090
KeyWords: ion exchange membrane; resistance; direct current method; electrochemical impedance spectroscopy; electrical double layer; diffusion boundary layer
year,volume(issue):pagination: 2017,37(1):44-50

 Electrochemical impedance spectroscopy (EIS) and direct current method (DC) can be used to investigate the electrochemical properties in the mass transport of ion exchange membrane (IEM). The resistance of membrane, electrical double layer (EDL) and diffusion boundary layer (DBL) can be analyzed separately by EIS. With the comparison of two equivalent circuits and in terms of their physical and electrochemical interpretations, a better equivalent circuit was selected, and the effect of flow rate on electrochemical properties of two membranes was investigated It is found that the resistance determined from DC was equal to the sum of each sublayer’s resistance in IEM systems from EIS; when the flow rate increased, the resistance of membrane and EDL did not change significantly, while the DBL resistance decreased obviously; with the increase of concentration, the resistance of mass transport system decreased significantly; the transport properties in cation exchange membrane and anion exchange membrane were different. Research results are of major importance for developments of characterization techniques on membrane transport properties and applications of IEMs.


第一作者简介:张文娟(1986-),女,山东泰安人,博士,主要从事方向为膜材料与膜过程及电化学性质的研究,E-mail: wenjuanvivian@126.com. *通讯作者,E-mail: majun@hit.edu.cn

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