Infrared (IR) light serves as an attractive renewable source of solar energy for photothermal CO₂ methanation. Herein, we report the synthesis of Ni nanoparticles (NPs) supported on TiO₂ (Ni/TiO₂) derived from MIL-125(Ti) (MOFs), which achieves a CH₄ production rate of 271.9 mmol g_Ni^-1 h^-1 with nearly 100% selectivity and good durability at least 48 h under IR irradiation. The results indicate the catalytic performance is predominantly driven by thermal energy from efficient IR light conversion. IR light acts as the most effective light source and induces highest activity and CH₄ selectivity over 8Ni/TiO₂ compared with UV–vis and full spectrum light. Highly-dispersed small-size Ni NPs, rich oxygen vacancies (OVs), strong adsorption capacity and enhanced CO₂ activation ability contribute to the high catalytic performance. OVs over Ni/TiO₂ play a crucial role in the CH₄ formation. This work demonstrates a feasible strategy towards the synthesis of MOF-derived catalysts for efficient photothermal CO₂ methanation.

红外 (IR) 光作为一种有吸引力的可再生太阳能用于光热 CO ₂甲烷化。在此，我们报告了在源自 MIL-125(Ti) (MOFs) 的TiO ₂ (Ni/TiO ₂ )上负载的 Ni 纳米颗粒 (NPs) 的合成，其 CH ₄生产速率为 271.9 mmol g _Ni ^-1 h ^{- 1}具有接近 100% 的选择性和在红外辐射下至少 48 小时的良好耐久性。结果表明催化性能主要由来自高效红外光转换的热能驱动。红外光作为最有效的光源，比 8Ni/TiO ₂具有最高的活性和 CH ₄选择性与紫外可见光和全光谱光相比。高度分散的小尺寸Ni NPs、丰富的氧空位（OVs）、强吸附能力和增强的CO ₂活化能力有助于高催化性能。Ni/TiO _{2 上的}OVs在CH ₄形成中起关键作用。这项工作展示了合成 MOF 衍生催化剂以实现高效光热 CO ₂甲烷化的可行策略。