Extended Data Fig. 2: Comparison of the electrolysis cell stability of the CCS-based PCECs in terms of degradation rates and operational duration with those of reported PCECs with the planar contact air electrode design.

PBCC/BZCYYb1711 (PrBa0.2Ca0.2Co2O5+δ/BaZr0.1Ce0.7Y0.1Yb0.1O3−δ), GCCC/BZCYYb1711 (Gd0.3Ca2.7Co3.82Cu0.18O9−δ/BaZr0.1Ce0.7Y0.1Yb0.1O3−δ), LSCF-PBC-BCO/BZCYYb1711 ((La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ-Pr1−xBaxCoO3−δ-BaCoO3−δ/BaZr0.1Ce0.7Y0.1Yb0.1O3−δ) (refs. 3,13,14,16,19,21,22,23,25,26,36,49,50,51). The EC stability and composition of the compared devices are detailed in Supplementary Table 5.