Electrolysis of CO2 in a proton conducting membrane

E. Ruiz-Trejo, J.T.S. Irvine

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

The electrolysis of CO2 is examined in a proton conducting solid electrolyser using BaCe0.5Zr0.3Y0.16Zn0.04O3 − δ as the electrolyte, nickel as the anode to oxidize H2O/H2 and copper, nickel or iron as the cathode to reduce CO2. The electrolyte and porous scaffolds were prepared by tape casting and the electrodes by impregnation. During electrolysis at 600ºC, currents as high as 35 mA/cm² (iron), 20 mA/cm² (copper) or 15 mA/cm2 (nickel) at 1.5 V pass through the 200 μm thick electrolytes. Small additions of Pt improve considerably the performance of the electrodes. For iron based cathodes Faradaic efficiencies up to 100% are achieved with production rates of H ≈ 0.14 μmol/cm2s, HO ≈ 0.25 μmol/cm2s and CO ≈ 0.05 μmol/cm2s. The possibilities of increasing these yields are discussed.

Original languageEnglish
Pages (from-to)157-164
Number of pages8
JournalSolid State Ionics
Volume252
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • Proton conductors
  • Copper cathode
  • Iron cathode
  • Nickel cathode

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