Efficacy of the sol–gel derived Ni-doped Mg-ferrites for an enhanced CO2 splitting activity is investigated. The results allied with the characterization indicate the formation of nominally phase pure Ni-doped Mg-ferrites with a coarser particle morphology. Ni-doped Mg-ferrites are further tested for multiple thermal reduction as well as CO2 splitting steps by using a thermogravimetric analyzer. The results associated with the thermogravimetric analysis confirmed that most of the Ni-doped Mg-ferrites attained a steady TR aptitude after crossing the 5th or 6th cycle. Likewise, the CS capability of all the Ni-doped Mg-ferrites accomplished consistency after 4th cycle (except for Ni0.11Mg0.88Fe2.01O4.005). The Ni0.90Mg0.11Fe2.04O4.070 showed the highest amount of O2 release (117.1 μmol/g cycle) and CO production (210.3 μmol/g cycle) in ten consecutive thermochemical cycles. Besides, Ni0.29Mg0.72Fe1.98O3.980 indicated better re-oxidation aptitude (nCO/nO2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ n_{\text{CO}} /n_{{{\text{O}}_{2} }} $$\end{document} ratio = 1.89) when compared with other Ni-doped Mg-ferrites.

中文翻译：

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在 MgFe2O4 中加入 Ni 以提高太阳能燃料生产过程中的 CO2 分解活性

研究了溶胶-凝胶衍生的镍掺杂镁铁氧体增强 CO2 分解活性的功效。与表征相关的结果表明，形成了具有较粗颗粒形态的名义相纯 Ni 掺杂 Mg 铁氧体。使用热重分析仪对 Ni 掺杂的 Mg 铁氧体进行了多次热还原和 CO2 分解步骤的进一步测试。与热重分析相关的结果证实，大多数掺杂 Ni 的镁铁氧体在经过第 5 或第 6 次循环后获得了稳定的 TR 特性。同样，所有 Ni 掺杂的 Mg 铁氧体的 CS 能力在第 4 次循环后达到一致性（Ni0.11Mg0.88Fe2.01O4.005 除外）。Ni0.90Mg0.11Fe2.04O4.070 表现出最高的 O2 释放量（117.1 μmol/g 循环）和 CO 产生量（210. 3 μmol/g 循环）在十个连续的热化学循环中。此外，Ni0.29Mg0.72Fe1.98O3.980 表明更好的再氧化能力 (nCO/nO2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \ usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ n_{\text{CO}} /n_{{{\text{O}} _{2} }} $$\end{document} ratio = 1.89) 与其他 Ni 掺杂的 Mg 铁氧体相比。