Demonstration of direct conversion of CO2/H2O into syngas in a symmetrical proton-conducting solid oxide electrolyzer. (12th January 2016)

• Record Type: Journal Article
• Authors: Gan, Lizhen; Ye, Lingting; Wang, Shijing; Liu, Mingzhou; Tao, Shanwen; Xie, Kui
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 2(2016)
• Page Start: 1170
• Page End: 1175
• Publication Date: 2016-01-12
• Subjects: Solid oxide electrolyzer -- Proton conductor -- LSCM -- Carbon dioxide reduction -- Steam electrolysis -- Syngas; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.11.032
• Languages: English
• ISSNs: 0360-3199

Abstract

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 H2 O/CO2 in cathode that causes cell performance degradation. In this work, we report a novel symmetrical PCSOE with redox-stable LSCM ((La0.75 Sr0.25 )0.95 Cr0.5 Mn0.5 O3−δ ) electrode for the electrochemical conversion of CO2 /H2 O 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. Highlights: Direct conversion of CO2 /H2 O into syngas has been demonstrated. Electrochemical process of CO2 reduction with H2 O electrolysis is studied. Loading of Ru catalyst in LSCM electrode promotes cell performances. Promising electrode polarizations and electrolysis efficiencies are obtained.