Conductivity and Permeability of Ion Conductive Membranes for Copper Chloride Electrolysis

Open Access
Author:
Kandt, Arwen Ruth
Area of Honors:
Engineering Science
Degree:
Bachelor of Science
Document Type:
Thesis
Thesis Supervisors:
  • Serguei Lvov, Thesis Supervisor
  • Judith A Todd, Honors Advisor
Keywords:
  • electrolysis
  • membranes
  • nafion
  • electrochemical impedance spectroscopy
  • conductivity
  • permeability
Abstract:
This project was carried out to develop methods to test the in-plane conductivity and copper permeability of a number of ion-exchange membranes. The conductivity of the membranes was measured using Electrochemical Impedance Spectroscopy (EIS). A Gamry EIS system was used in conjunction with a BekkTech conductivity cell. This system was previously used to measure membrane conductivity in gaseous mediums, but was converted for use in liquids during this project. The permeability of the membranes was measured using a basic diffusion cell. The change in copper concentration was measured using a complexometric titration method. The solution was titrated with EDTA (Ethylenediaminetetraacetic acid), with a murexide indicator. The membranes considered in this study are intended for use in CuCl electrolysis. The CuCl thermochemical cycle is promising for its relatively low temperature and high efficiency. This cycle could be an economically feasible and environmentally safe way to produce hydrogen. Hydrogen used as an energy carrier could store excess energy produced by renewable technologies and allow that energy to be transferred to where it is needed.