Black phosphorus (BP), an interesting and multi-functional non-metal material, has attracted widespread attention. In this work, 2D BP/2D g-C₃N₄ heterostructure had been fabricated at extremely low temperature, which was used to reduce CO₂ for the first time. With introduction of 2D BP, the separation of photogenerated holes and electrons was extremely boosted, and composites showed excellent photocatalytic performance (CO₂ to CO). Meanwhile, the targeted composite could keep high selectivity for CO generation and CO generation rate can be up to 187.7 μmol g⁻¹ h⁻¹. The formation process of the unique heterostructure and the key factor affecting the photocatalytic performance were also discussed. This work provides a new approach for designing metal free photocatalyst, which is used for CO₂ reduction.

黑磷（BP）是一种有趣的多功能非金属材料，引起了广泛的关注。在这项工作中，已经在极低的温度下制备了2D BP / 2D gC ₃ N ₄异质结构，这是第一次用于减少CO ₂。随着2D BP的引入，极大地促进了光生空穴和电子的分离，并且复合材料表现出出色的光催化性能（从CO ₂到CO）。同时，目标复合材料可以保持较高的CO生成选择性，并且CO生成速率可以高达187.7μmolg ^-1  h ^-1。还讨论了独特的异质结构的形成过程以及影响光催化性能的关键因素。这项工作为设计用于CO ₂还原的不含金属的光催化剂提供了一种新方法。