Demonstration of direct conversion of CO2/H2O into syngas in a symmetrical proton-conducting solid oxide electrolyzer

Lizhen Gan, Lingting Ye, Shijing Wang, Mingzhou Liu, Shanwen Tao, Kui Xie

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7 Citations (Scopus)

Abstract

We have previously reported the electrochemical reduction of CO2 to CO with simultaneous steam electrolysis in a proton conducting solid oxide electrolyzer (PCSOE); however, the conventional Ni-cermet electrode is rapidly oxidized by H2O/CO2 in cathode that causes cell performance degradation. In this work, we report a novel symmetrical PCSOE with redox-stable LSCM ((La0.75Sr0.25)0.95Cr0.5Mn0.5O3-δ) electrode for the electrochemical conversion of CO2/H2O into syngas (CO/H2). The Ru catalyst is impregnated to LSCM to improve electrode activity. Electrochemical measurements demonstrate that the CO2 is electrochemically reduced to syngas (CO/H2) with simultaneous steam electrolysis. The loading of Ru catalyst promotes the electrochemical process with higher Faradic efficiency while induces a more competitive process of hydrogen evolution at 700 °C.

Original languageEnglish
Pages (from-to)1170-1175
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number2
DOIs
Publication statusPublished - 12 Jan 2016
Externally publishedYes

Keywords

  • Carbon dioxide reduction
  • LSCM
  • Proton conductor
  • Solid oxide electrolyzer
  • Steam electrolysis
  • Syngas

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