Abstract
The commercial viability of solid oxide electrolysis cells (SOECs) for the electrochemical reduction of CO2 to CO is hampered by the sluggish electrocatalytic activity of the electrode materials. In this study, a series of perovskites, Pr0.5Sr0.5Cr0.1Fe0.9-xNixO3-δ (x = 0.1, 0.2, PSCFNx) with different Ni doping levels were synthesized. The results showed that increasing Ni doping led to the creation of more oxygen vacancies. Furthermore, treatment of PSCFNx in a reducing atmosphere resulted in a structural transformation into a composite with a heterogeneous interface between the Ruddlesden-Popper perovskite (RP-PSCFNx) and an exsolved Ni-Fe metal alloy. The re-PSCFN0.2-based cell showed a current density of 2.40 A cm−2 and a Faraday efficiency (FE%) of almost 100 % at 850 °C and 1.6 V, an improvement of 18 % in comparison to the re-PSCFN0.1-based cell. This study provides a strategy to synergistically improve the electrochemical reduction of CO2 activity of SOECs by constructing an active heterogeneous interface and increasing the oxygen vacancy content.
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