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Capacitance-Assisted Sustainable Electrochemical Carbon Dioxide Mineralisation

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JournalCHEMSUSCHEM
DateAccepted/In press - 23 Nov 2017
DateE-pub ahead of print - 24 Nov 2017
DatePublished (current) - 10 Jan 2018
Issue number1
Volume11
Number of pages12
Pages (from-to)137-148
Early online date24/11/17
Original languageEnglish

Abstract

An electrochemical cell comprising a novel dual-component graphite and Earth-crust abundant metal anode, a hydrogen producing cathode and an aqueous sodium chloride electrolyte was constructed and used for carbon dioxide mineralisation. Under an atmosphere of 5 % carbon dioxide in nitrogen, the cell exhibited both capacitive and oxidative electrochemistry at the anode. The graphite acted as a supercapacitive reagent concentrator, pumping carbon dioxide into aqueous solution as hydrogen carbonate. Simultaneous oxidation of the anodic metal generated cations, which reacted with the hydrogen carbonate to give mineralised carbon dioxide. Whilst conventional electrochemical carbon dioxide reduction requires hydrogen, this cell generates hydrogen at the cathode. Carbon capture can be achieved in a highly sustainable manner using scrap metal within the anode, seawater as the electrolyte, an industrially relevant gas stream and a solar panel as an effective zero-carbon energy source.

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© 2017 The Authors.

    Research areas

  • Aluminum/chemistry, Carbon Dioxide/chemistry, Electrochemical Techniques/methods, Electrodes, Graphite/chemistry, Hydrogen-Ion Concentration, Oxidation-Reduction, Porosity

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