Figure 10.

Time-averaged space-time yield ($\overline{\mathrm{STY}}$) of CO vs. number of redox cycles: (a) Comparison of CO $\overline{\mathrm{STY}}$ for non-coated Fe₂O₃/ZrO₂ material and core-shell structured Fe₂O₃/ZrO₂@ZrO₂ nanomaterial during 20 redox cycles at 650 °C; (b) Stability of CO $\overline{\mathrm{STY}}$ over Fe₂O₃/ZrO₂@ZrO₂ during 100 prolonged redox cycles at 650 °C, the insert figure is the EDX element mapping of the spent core-shell material. Each cycle (10 min) is composed of 2 min H₂ (5% in Ar) reduction, 2 min CO₂ (pure) re-oxidation and 3 min intermediate He purging. Gas flow rates: 0.04 mmol∙s⁻¹.