Steam/CO2 electrolysis in symmetric solid oxide electrolysis cell with barium cerate-carbonate composite electrolyte. (1st February 2016) - Pu, Tingting
Highlights: Symmetric electrode LSCM was applied to steam/CO2 electrolysis. Sufficient steam supply is favorable to electrolysis performances. Fuel synthesis based on LSCM can be realized in proton-type SOEC. Good chemical stability of LSCM for steam electrolysis and CO2 reduction. Abstract: A composite electrolyte, Zr doped BaCe0.8 Y0.2 O3-δ (BaCe0.5 Zr0.3 Y0.2 O3-δ, BCZY) and binary carbonates [(Li, Na)2 CO3 ] (LNCO) was first applied to reduce CO2 accompanied with steam electrolysis in solid oxide electrolysis cell (SOEC) at 600 °C, lower than which conventional SOEC composed by YSZ works in (usually above 800 °C). Electrolysis performances are improved due to sufficient steam feed at oxygen electrode side (30–110 ml/min). Steam electrolysis provides proton source for the reduction of CO2 . Application of composite electrolyte promotes proton transport and directly leads to H2 even CH4 production. To a certain degree, carbon resistance guarantees the symmetric SOEC operation at a lower bias potential of 0.5 V (vs.OCV) applied. A redox-stable and carbon-tolerant LSCM as symmetric electrode with a hybrid-ion-conducting composite electrolyte realizes the fuel synthesis by CO2 reduction in proton-type solid oxide electrolyzer.