As a photocatalyst responding to visible light, red phosphorus has the advantages of cheap and easy availability, low toxicity and suitable band gap. In this work, ultra-thin red phosphorus (URP) with the narrower band gap through ultrasound for 8 h was successfully synthesized. Though a series of characterization (such as: XPS analysis, photoelectric response analysis, Raman analysis, AFM images, etc.), the narrow band gap and ultra-thin nanosheet structure could promote the generation of more photogenerated electrons and effectively improve the separation rate of photogenerated charges for highly efficient hydrogen evolution. URP showed the excellent photocatalytic hydrogen production without any cocatalysts (0.55 mmol g⁻¹ h⁻¹), which was 2.88 times for untreated red phosphorus. In addition, URP overcame the limited stability and decreased the band gap of red phosphorus, producing hydrogen at a rate of 0.16 mmol g⁻¹ h⁻¹ after three cycles. This readily available and ultra-thin material can be used as a substrate material for other materials due to its similar graphene thickness.

红磷作为一种对可见光有反应的光催化剂，具有廉价，易得，毒性低，能带隙合适的优点。在这项工作中，成功地合成了8h的带隙较窄的超薄红磷（URP）。尽管进行了一系列表征（例如：XPS分析，光电响应分析，拉曼分析，AFM图像等），但窄带隙和超薄纳米片结构可以促进更多光生电子的产生并有效提高分离率的光生电荷用于高效析氢。URP显示出优异的光催化制氢性能，而没有任何助催化剂（0.55 mmol g ^-1  h ^-1），这是未经处理的红磷的2.88倍。另外，URP克服了有限的稳定性并且减小了红磷的带隙，在三个循环之后以0.16mmol g ^-1  h ^-1的速率产生氢。这种容易获得的超薄材料由于其相似的石墨烯厚度，可以用作其他材料的基材。