Photothermal CO₂ methanation is crucial for carbon neutralization and long-term space exploration, but the reliance on sunlight irradiation limits its practical application. Herein, a fluorite two-dimensional solid solution of NiO and CeO₂ (2D Ni₁Ce₁O₃) is synthesized for low-temperature CO₂ methanation, resulting in 80 ± 4 and 2125 ± 43 mmol g⁻¹ h⁻¹ of CH₄ production rates at 200 and 300 °C respectively, with 99.58 ± 0.12% CH₄ selectivity. This is attributed to 2D Ni₁Ce₁O₃ strengthening the CO₂ adsorption and changing the CO₂ methanation paths. When we used a homemade TiC/Cu based device to absorb sunlight to heat the catalyst, 2D Ni₁Ce₁O₃ showed a photothermal CO₂ methanation rate of 2901 mmol g⁻¹ h⁻¹ under weak sunlight irradiation and more interestingly a robust CO₂ methanation rate of ∼830 mmol h⁻¹ in dark environments. Consequently, the outdoor demonstration could drive CO₂ methanation for five continuous outdoor days and nights with a total CH₄ yield of 898 m³ and 10 tons of boiled water, showing the industrial potential of photothermal CO₂ methanation.

中文翻译：

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无需外部能量输入的持续光热 CO2 甲烷化


光热 CO₂ 甲烷化对于碳中和和长期太空探索至关重要，但对阳光照射的依赖限制了其实际应用。在此，合成了 NiO 和 CeO₂ （2D Ni₁Ce₁O₃） 的萤石二维固溶体，用于低温 CO₂ 甲烷化，在 200 °C 和 300 °C 下分别产生 80 ± 4 和 2125 ± 43 mmol ^{g-1 h-1} 的 CH₄ 生产率，其中 99.58 ± 0.12% CH₄选择性。这归因于 2D Ni₁Ce₁O₃ 加强了 CO₂ 吸附并改变了 CO₂ 甲烷化路径。当我们使用自制的 TiC/Cu 基装置吸收阳光以加热催化剂时，2D Ni₁Ce₁O₃ 在微弱的阳光照射下显示出 2901 mmol ^{g-1 h-1} 的光热 CO₂ 甲烷化速率，更有趣的是，∼830 mmol ^h-1 的稳健 CO₂ 甲烷化速率在黑暗环境中。因此，户外演示可以连续五个昼夜在户外驱动 CO₂ 甲烷化，CH₄ 总产率为 898 m³ 和 10 吨开水，显示了光热 CO₂ 甲烷化的工业潜力。