Solar thermochemical cycles offer a viable option for the production of green synthetic fuels from CO₂ and H₂O. Two-step cycles using redox materials consist of a high-temperature reduction creating oxygen vacancies, followed by a re-oxidation step with an oxidant gas (CO₂ and/or H₂O), resulting in CO and/or H₂ production. This study focuses on the thermochemical performance in a solar reactor of a new kind of composite reactive material: reticulated ceria foam with uniform perovskite coating, forming a dual-phase layered heterostructure. La_0.5Sr_0.5Mn_0.9Mg_0.1O₃ (LSMMg) was selected as perovskite coating due to its high fuel productivity and thermochemical stability upon cycling. The perovskite coating improves the reduction step by increasing the reduction extent reached by the reactive material. The results revealed significant enhancement of oxygen exchange in the dual-phase composite material during reduction compared to individual components. The enhanced reduction extent had a beneficial effect on the oxygen release rate and the total amount of fuel produced by CO₂ and H₂O splitting, whereas an adverse impact on the peak rate during H₂/CO evolution was noticed. Decreasing the reduction pressure allowed enhancing the non-stoichiometric oxygen extent, while the re-oxidation extent increased with the inlet oxidant molar fraction. With suitable operating conditions (reduction at 0.100 bar and oxidation in 100 % CO₂), the LSMMg-coated ceria foam produced a higher amount of fuel but with lower fuel production rate in comparison with pure ceria foam. This study points out the beneficial effects of composite redox materials consisting of LSMMg-coated ceria foam in enhancing the oxygen exchange capacity of ceria for solar fuel production.

太阳能热化学循环为从CO ₂和H ₂ O生产绿色合成燃料提供了可行的选择。使用氧化还原材料的两步循环包括高温还原，产生氧空位，然后进行氧化剂的再氧化步骤气体（CO ₂和/或H ₂ O），导致产生CO和/或H ₂。这项研究的重点是新型复合反应材料在太阳能反应堆中的热化学性能：具有均匀钙钛矿涂层的网状二氧化铈泡沫，形成双相分层异质结构。La _0.5 Sr _0.5 Mn _0.9 Mg _0.1 O ₃由于其高燃料生产率和循环时的热化学稳定性，（LSMMg）被选作钙钛矿涂料。钙钛矿涂层通过增加反应性材料达到的还原程度来改善还原步骤。结果表明，与单个组分相比，还原过程中双相复合材料中氧交换的显着增强。还原程度的提高对氧气释放速率和由CO ₂和H ₂ O分解产生的燃料总量具有有益的影响，而对H ₂期间的峰值速率具有不利影响注意到/ CO的演变。降低还原压力可以提高非化学计量的氧气范围，而再氧化程度则随入口氧化剂摩尔分数的增加而增加。在合适的操作条件下（在0.100 bar时还原并在100％CO _2中氧化），与纯二氧化铈泡沫相比，涂有LSMMg的二氧化铈泡沫产生的燃料量更大，但燃料生产率却更低。这项研究指出了由LSMMg包覆的二氧化铈泡沫组成的复合氧化还原材料对提高二氧化铈用于太阳能生产的氧交换能力的有益作用。