The O2-assisted Al/CO2 electrochemical cell: A system for CO2 capture/conversion and electric power generation

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Science Advances  20 Jul 2016:
Vol. 2, no. 7, e1600968
DOI: 10.1126/sciadv.1600968
  • Fig. 1 Architectures of metal/CO2 electrochemical cells as capture systems.

    (A) Secondary metal/CO2 electrochemical cell where CO2 is concentrated by recharging. (B) Primary metal/CO2 electrochemical cell where captured CO2 is concentrated or converted to Cn (n ≥ 2) valuable products.

  • Fig. 2 Electrochemical performance of Al cell under different gas conditions.

    Galvanostatic discharge of Al under Ar, 100% CO2, 100% O2, and 80% CO2 using [EMIm]Cl/AlCl3 electrolyte ratio of 1:2 and current density of 70 mA/gCarbon. Inset: CV for three-electrode cell under 100% O2 and 80% CO2 with a sweep rate of 0.1 mV/s.

  • Fig. 3 Coupled TGA-FTIR spectra.

    TGA curves and coupled time-resolved FTIR spectra for discharged cathodes (under 80% CO2 and 100% O2), undischarged cathode, and chemically synthesized aluminum oxalate. Ramp-up rates for solid and dashed lines are 5°C/min and 0.05°C/min, respectively.

  • Fig. 4 Preliminary system analysis.

    (A) Overall balance of CO2 emissions captured/abated by the primary Al/80% CO2 electrochemical system contrasted with emissions of aluminum metal production. (B) Overall balance of CO2 emissions, allowing the recycling of Al2O3 for production of aluminum metal.

Supplementary Materials

  • Supplementary Materials

    This PDF file includes:

    • table S1. DART-MS–detected species.
    • table S2. Typical DART-MS results.
    • table S3. EDXS spectra.
    • table S4. XPS wide survey spectra.

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