Abstract In this paper, the effect of doping of transition metal cations on thermal reduction and CO 2 splitting ability of Ce 0.9 M 0.1 O 2−δ materials (where, M = Ni, Zn, Mn, Fe, Cu, Cr, Co, Zr) is investigated by performing multiple thermochemical cycles using a thermogravimetric analyzer. The Ce 0.9 M 0.1 O 2−δ materials are successfully derived via co-precipitation method and analyzed via powder X-ray diffraction (PXRD), scanning electron microscope (SEM), and BET surface area analyzer (BET). The Ce 0.9 M 0.1 O 2−δ materials derived are further tested towards their O 2 releasing and CO production capacity by performing ten thermochemical CO 2 splitting cycles. The obtained TGA results indicate that CeZn and CeFe are capable of releasing higher amounts of O 2 as compared to other Ce 0.9 M 0.1 O 2−δ materials at 1400 °C. Likewise, these two oxides are again observed to be better than other Ce 0.9 M 0.1 O 2−δ materials in terms of their CO production capacity at 1000 °C. For instance, CeZn and CeFe releases an average of 50.5 and 50.0 μmol of O 2 /g·cycle during ten thermochemical cycles in which the thermal reduction step is performed at at 1400 °C. Also, the CO production capacity of CeZn and CeFe material is observed to be equal to 103.3 and 96.3 μmol of CO/g·cycle for ten thermochemical cycles in which the CO 2 splitting is carried out at 1000 °C. The compositional and thermal stability of all Ce 0.9 M 0.1 O 2−δ materials is also analyzed after performing ten thermochemical cycles. The phase composition of all the Ce 0.9 M 0.1 O 2−δ materials remain unchanged after performing ten thermochemical cycles. However, the crystallite size of all the Ce 0.9 M 0.1 O 2−δ materials increases after performing the ten thermochemical cycles due to the high temperature processing.

中文翻译：

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用于太阳能热化学燃料生产的过渡金属掺杂氧化铈

摘要 本文研究了过渡金属阳离子的掺杂对Ce 0.9 M 0.1 O 2−δ 材料（其中，M = Ni、Zn、Mn、Fe、Cu、Cr、Co、 Zr) 通过使用热重分析仪进行多次热化学循环来研究。Ce 0.9 M 0.1 O 2-δ 材料通过共沉淀法成功衍生，并通过粉末X射线衍射（PXRD）、扫描电子显微镜（SEM）和BET表面积分析仪（BET）进行分析。通过执行十次热化学CO 2 裂解循环，进一步测试衍生的Ce 0.9 M 0.1 O 2-δ 材料的O 2 释放和CO 生产能力。获得的TGA结果表明，在1400°C下，与其他Ce 0.9 M 0.1 O 2-δ 材料相比，CeZn和CeFe能够释放更高量的O 2 。同样地，再次观察到这两种氧化物在 1000 °C 下的 CO 生产能力方面优于其他 Ce 0.9 M 0.1 O 2-δ 材料。例如，CeZn 和 CeFe 在 10 个热化学循环中平均释放 50.5 和 50.0 μmol O 2 /g·循环，其中热还原步骤在 1400 °C 下进行。此外，观察到 CeZn 和 CeFe 材料的 CO 生产能力等于 103.3 和 96.3 μmol CO/g·循环，在 10 个热化学循环中，其中 CO 2 分裂在 1000 °C 下进行。在执行十次热化学循环后，还分析了所有Ce 0.9 M 0.1 O 2-δ 材料的组成和热稳定性。在进行十次热化学循环后，所有Ce 0.9 M 0.1 O 2-δ 材料的相组成保持不变。然而，所有Ce 0.9 M 0 的微晶尺寸。