The
development of cathode materials with high catalytic activity
and low cost is a challenge for CO2 electrolysis based
on solid oxide electrolysis cells. Herein, we report a low-cost and
highly active metallic Fe nanoparticle-decorated Ruddlesden-Popper
(La, Sr)FeO4+δ cathode catalyst (Fe-RPLSF), which
shows a high oxygen vacancy concentration and robust CO2 reduction rate. At 850 °C, the current density of the electrolysis
cell with the Fe-RPLSF cathode reaches −1920 mA cm–2 at a voltage of 1.5 V, and the Faraday efficiency is as high as
100%. The polarization resistance at low frequency (0.1–10
Hz), which is the rate-limit step for CO2 electrolysis,
significantly decreases with the exsolved Fe nanoparticles because
of improved CO2 dissociative adsorption. Moreover, our
electrolysis cell demonstrates acceptable short-term stability for
direct CO2 electrolysis.
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