Enhanced CO2 Electrolysis with Mn-doped SrFeO3-δ Cathode

Solid oxide carbon dioxide electrolysers are expected to play a key role in carbon-neutral energy landscape. However, the limited activity of traditional ceramic cathodes still restricts the electrochemical performance. Here we report the doping of Mn at the B site of SrFeOcathode to improve COelectrolysis. The oxygen vacancy concentration is increased by ～30% with Mn doping while the surface oxygen exchange coefficients are enhanced by ～10 times. The chemisorption of COindicates the presence of chemical intermediate state between COmolecule and carbonate ion on the oxygen-deficient cathode surface which therefore leads to the desorption temperature of ～800 ℃. The Mn-doped SrFeOenhances COelectrolysis with no performance degradation being observed even after high-temperature operation of 100 hours.