Jump to main content
Jump to site search

Asymmetric Faradaic systems for selective electrochemical separations


Ion-selective electrochemical systems are promising for liquid phase separations, particularly for water purification and environmental remediation, as well as in chemical production operations. Redox-materials offer an attractive platform for these separations based on their remarkable ion selectivity. Water splitting, a primary parasitic reaction in aqueous-phase processes, severely limits the performance of such electrochemical processes through significant lowering of current efficiencies and harmful changes in water chemistry. We demonstrate that an asymmetric Faradaic cell with redox-functionalization of both the cathode and the anode can suppress water reduction and enhance ion separation, especially targeting organic micropollutants with current efficiencies of up to 96% towards selective ion-binding. A number of organometallic redox-cathodes with electron-transfer properties matching those of a ferrocene-functionalized anode, and with potential cation selectivity, were used in the asymmetric cell, with cobalt polymers being particularly effective towards aromatic cation adsorption. We demonstrate the viability and superior performance of dual-functionalized asymmetric electrochemical cells beyond their use in energy storage systems; they can be considered as a next-generation technology for aqueous-phase separations, and we anticipate their broad applicability in other processes, including electrocatalysis and sensing.

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 07 Jan 2017, accepted on 18 Apr 2017 and first published on 18 Apr 2017

Article type: Paper
DOI: 10.1039/C7EE00066A
Citation: Energy Environ. Sci., 2017, Accepted Manuscript
  •   Request permissions

    Asymmetric Faradaic systems for selective electrochemical separations

    X. Su, K. Tan, J. Elbert, C. Rüttiger, M. Gallei, T. F. Jamison and T. A. Hatton, Energy Environ. Sci., 2017, Accepted Manuscript , DOI: 10.1039/C7EE00066A

Search articles by author