Photocatalytic reduction of CO₂ to carbon fuels is an important target but highly challenging to achieve. Here, we report the efficient photoconversion of CO₂ into formic acid over a Ga(III)-based metal–organic framework (MOF) material using triethanolamine as the sacrificial agent. Under light irradiation and at room temperature, photoreduction of CO₂ over MFM-300(Ga) yields formic acid with a selectivity of 100%, a high productivity of 502 ± 18 μmol·g_cat⁻¹·h⁻¹, and excellent catalytic stability. In situ electron paramagnetic resonance spectroscopy reveals that MFM-300(Ga) promotes the generation of CO₂^•− radical anions as a reaction intermediate driven by strong binding and activation of CO₂ molecules at the bridging –OH sites within the pore. This study represents the first example of a Ga(III)-based MOF catalyst for CO₂ reduction.

_{将CO 2}光催化还原为碳燃料是一个重要目标，但实现起来极具挑战性。_{在这里，我们报道了使用三乙醇胺作为牺牲剂，在基于 Ga(III) 的金属有机骨架 (MOF) 材料上将 CO 2}高效光转化为甲酸。在光照和室温下，在 MFM-300(Ga) 上光还原 CO ₂得到甲酸，选择性为 100%，产率高达 502 ± 18 μmol·g _cat ^-1 ·h ^-1，具有优异的催化性能稳定。原位电子顺磁共振光谱表明MFM-300(Ga)促进了CO _2的生成^•−自由基阴离子作为反应中间体，由孔内桥连-OH位点处的CO _{2分子的强结合和活化驱动。该研究代表了用于 CO 2}还原的基于 Ga(III) 的 MOF 催化剂的第一个示例。