In this work, we present for the first time the preparation and evaluation of Ceria-based mixed oxides reticulated porous ceramic (RPC) structures for H₂ production by thermochemical water splitting. After appropriate screening of the powder materials, ceria-based materials modified with Co, Mn and Zr were discarded due to their low cyclability and/or hydrogen productivity, derived from segregation of active phases or sintering during the thermal reduction and reoxidation. Sponge replica method has been optimized to allow obtaining a Ce_0.9Fe_0.1O_y RPC sponge structure with an outstanding hydrogen production of 15 STPcm³/g_material·cycle at a maximum temperature of 1300 °C. This better performance, comparing to the powder, can be attributed to the open macroporosity of the reticulated porous structure which enhances both heat and mass transfer. The H₂ production is maintained along several consecutive cycles without loss of activity, reinforcing the favorable prospects for large-scale hydrogen production.

在这项工作中，我们首次提出了通过热化学水分解法制备和评价用于H ₂生产的二氧化铈基混合氧化物网状多孔陶瓷（RPC）结构的方法。在对粉末材料进行适当的筛选后，由于它们的低循环能力和/或氢生产率（源自热还原和再氧化过程中的活性相偏析或烧结）而被废弃，因此用Co，Mn和Zr改性的二氧化铈基材料被丢弃。海绵复制品方法已被优化，以允许获得的Ce _0.9铁_0.1 ø _ý具有杰出制氢15 STPcm的RPC海绵结构³ / g的_材料·在最高温度1300°C下循环。与粉末相比，这种更好的性能可归因于网状多孔结构开放的大孔，从而增强了传热和传质。在连续的几个循环中保持H _2的产生而没有活性的损失，从而增强了大规模制氢的有利前景。