Artificial CO₂ photoreduction to solar fuels represents an eco-friendly and sustainable solution to obtain “sunshine” feedstocks by using renewable energy media. Herein, we report that single cobalt atoms anchored on two-dimensional Ti₃C₂T_x-MXene nanosheets act as an efficient photocatalytic ensemble for visible-light CO₂ reduction, wherein the Ti₃C₂T_x nanosheets bridge visible-light absorbers (ruthenium complex) with cobalt active sites. The single cobalt atoms build strong interactions with Ti₃C₂T_x by forming metal-oxygen/carbon bonds, resulting in the formation of the Co-Ti₃C₂T_x ensemble. As a result, the production rate of CO reaches a high value of 6.06 mmol h⁻¹ g⁻¹ over the optimal Co-Ti₃C₂T_x, which markedly exceeds previous MXene-based catalysts for CO₂ photoreduction. Theoretical calculation manifests that the isolated Co atoms coordinated with Ti₃C₂T_x can effectively facilitate the generation of CO. This work may provide a new line of thought into the rational design of high-activity MXene-based photocatalysts toward artificial CO₂ conversion.

人造CO _2光还原为太阳能燃料代表了一种生态友好且可持续的解决方案，可通过使用可再生能源介质获得“阳光”原料。在此，我们报道了锚固在二维Ti ₃ C ₂ T _x -MXene纳米片上的单个钴原子可作为有效的光催化还原可见光CO _2的方法，其中Ti ₃ C ₂ T _x纳米片桥接可见光吸收剂（钌络合物）具有钴活性位点。单个钴原子与Ti ₃ C ₂ T _x建立强相互作用通过形成金属-氧/碳键，导致形成Co-Ti ₃ C ₂ T _x系。其结果是，CO的生产速率达到6.06毫摩尔h的高值^-1克^-1在最佳联合的Ti ₃ c ^ ₂ Ť _X，这显着地超过基于MXene在先催化剂CO ₂光还原。理论计算表明，孤立的Co原子与Ti ₃ C ₂ T _x配位可以有效地促进CO的生成。这项工作可能为高活性MXene基光催化剂向人工CO ₂转化的合理设计提供新思路。