title: Continuous operation of membrane capacitive deionization cells assembled with dissimilar potential of zero charge electrode pairs.
abstract: The performance of single stack membrane assisted capacitive deionization cells configured with pristine and nitric acid oxidized Zorflex (ZX) electrode pairs was evaluated. The potentials of zero charge for the pristine and oxidized electrodes were respectively -0.2V and 0.2V vs. SCE. Four cell combinations of the electrodes including a pristine anode-pristine cathode, oxidized anode-pristine cathode, pristine anode-oxidized cathode, and oxidized anode-oxidized cathode were investigated. When the PZC was located within the polarization window of the electrode, diminished performance was observed. The cells were operated at 1.2 V and based on potential distribution results, the effective working potentials were ∼0.9, 0.8, 1.2, and 1.1 V for the pristine anode-pristine cathode, oxidized anode-pristine cathode, pristine anode-oxidized cathode, and oxidized anode-oxidized cathode cells, respectively. The highest electrosorption capacity of 17 mg NaCl/g ZX was observed for the pristine anode-oxidized cathode cell, where both PZCs were outside of the polarization window.
authors.affiliation: Center for Applied Energy Research, University of Kentucky, Lexington, KY 40511, USA.
authors.forename: Ayokunle
authors.initials: A
authors.lastname: Omosebi
authors.affiliation: Center for Applied Energy Research, University of Kentucky, Lexington, KY 40511, USA.
authors.forename: Xin
authors.initials: X
authors.lastname: Gao
authors.affiliation: Center for Applied Energy Research, University of Kentucky, Lexington, KY 40511, USA.
authors.forename: Jeffery
authors.initials: J
authors.lastname: Rentschler
authors.affiliation: Center for Applied Energy Research, University of Kentucky, Lexington, KY 40511, USA. Electronic address: james.landon@uky.edu.
authors.forename: James
authors.initials: J
authors.lastname: Landon
authors.affiliation: Center for Applied Energy Research, University of Kentucky, Lexington, KY 40511, USA. Electronic address: kunlei.liu@uky.edu.
authors.forename: Kunlei
authors.initials: K
authors.lastname: Liu
mesh_terms: D025802:Electric Capacitance; D004566:Electrodes; D037741:Fullerenes / Q000737:chemistry*; D008567:Membranes, Artificial; D017942:Nitric Acid / Q000737:chemistry*; D010084:Oxidation-Reduction; D012965:Sodium Chloride / Q000302:isolation & purification*; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*
chemical_list: D037741:Fullerenes; D008567:Membranes, Artificial; C530172:pristine (C60); D017942:Nitric Acid; D012965:Sodium Chloride
keywords: Deionization; Ion-exchange membranes; Membrane capacitive deionization; Potential of zero charge; Water desalination