Direct conversion CO₂ to useful chemical fuels by photocatalysis has been considered to be a promising strategy for renewable energy production. The realization of this goal relies mainly on the development of photocatalysts with ideal charge separation efficiency. Here, we use all-inorganic perovskite nanocrystals (CsPbBr₃) immobilized on two-dimensional (2D) black phosphorus nanosheets (BP), resulting in a new and effective CsPbBr₃/BP photocatalyst for CO₂ photoreduction. Compare to pristine CsPbBr₃, the introduction of BP generates more active sites for facilitating CO₂ activation and trapped the excited electrons from CsPbBr₃ with high charge separation efficiency. Time-resolved photoluminescence and transient absorption measurements together with density functional theory calculations provide a clear elucidation of the charge separation pathways that contribute to the enhanced CO₂ conversion rate. This significant feature provides a new venue for constructing all-inorganic perovskite-based photocatalyst by combining with BP for solar energy conversion and artificial photosynthesis.

通过光催化将CO ₂直接转化为有用的化学燃料被认为是用于可再生能源生产的有前途的策略。该目标的实现主要取决于具有理想电荷分离效率的光催化剂的开发。在这里，我们使用固定在二维（2D）黑磷纳米片（BP）上的全无机钙钛矿纳米晶体（CsPbBr ₃），产生了一种新的有效的CO ₂光还原CsPbBr ₃ / BP光催化剂。与原始CsPbBr _3相比，BP的引入产生了更多的活性位点以促进CO ₂活化，并捕获了来自CsPbBr ₃的激发电子电荷分离效率高。时间分辨的光致发光和瞬态吸收测量值以及密度泛函理论计算结果清楚地说明了有助于提高CO ₂转化率的电荷分离途径。通过与BP结合使用太阳能转化和人工光合作用，该重要特征为构建基于全无机钙钛矿的光催化剂提供了新的场所。