Chemical looping HO splitting is considered as a promising approach to produce hydrogen thanks to its lower energy consumption and carbon footprint compared with traditional steam reforming. Fe-based oxides have been paid much attention but suffer from inferior H production rate and stability due to insufficient activation for HO. Herein, it was found that the introduction of Cr into MgFe spinel oxides (MgFeCrO, MFCO) could greatly increase the performance of HO splitting driven by CH reduction with the highest peak H production rate of about 4.65 mmol min g, H productivity of about 2.88 mmol g and good stability during multiple redox cycles for MFCO-46 (the atomic ratio of Fe and Cr of 2:3), which exceeded most of the state-of-the-art Fe-based oxides. This originated from the Cr doping promoting Fe nanoparticles exsolution by activating CH and Fe-O-Cr species formation which relay catalyzed HO splitting and was favorable for the fast recovery of lattice oxygen converted.

中文翻译：

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化学循环H2O分解中Fe0和Fe-Ov-Cr物质的中继催化提高铁基尖晶石的产氢能力


与传统蒸汽重整相比，化学循环 H2O 分解被认为是一种有前途的制氢方法，因为它的能耗和碳足迹更低。铁基氧化物受到了广泛关注，但由于对H2O的活化不足，导致产氢率和稳定性较差。研究发现，将 Cr 引入 MgFe 尖晶石氧化物（MgFeCrO，MFCO）中可以大大提高由 CH 还原驱动的 H2O 分解性能，最高峰值 H 产率约为 4.65 mmol min g，H 产率约为 2.88 MFCO-46（Fe 和 Cr 的原子比为 2:3）在多次氧化还原循环中具有 mmol g 的稳定性和良好的稳定性，超过了大多数最先进的铁基氧化物。这源于Cr掺杂通过激活CH和Fe-O-Cr物质的形成促进Fe纳米颗粒的溶出，继而催化H2O分解，有利于晶格氧转化的快速恢复。