Size-constrained ultrathin BiOCl nanosheets@C composites were achieved by one-step hydrothermal route. It was found that the carbon coated on the surface of BiOCl nanosheets not only accelerated the separation of electrons and holes, but also restricted the outward growth of the BiOCl crystal structure to expose more active catalytic sites. In addition, the obtained composites have stable and close interface contact, beneficial for the structural stability of products as well as the rapid charge transfer. The average sheet thickness was in the range of 20–60 nm. Compared with the ability for pure BiOCl to degrade RhB, the degradation rate of the optimal composite can reach 100% within 15 min, while the corresponding photocurrent intensity could reach 5.6 µA·cm⁻², and its impedance value was also the smallest. The removal experiments of active substances showed that h⁺ and O²₋ play important roles in the process of photocatalytic degradation. It can be expected that the resulted composites in this work can be used as potential materials for photocatalytic and photoelectrochemical applications.

通过一步水热法实现了尺寸受限的超薄BiOCl纳米片@ C复合材料。发现在BiOCl纳米片的表面上涂覆的碳不仅加速了电子和空穴的分离，而且限制了BiOCl晶体结构的向外生长以暴露更多的活性催化位点。另外，所获得的复合材料具有稳定和紧密的界面接触，有利于产品的结构稳定性以及快速的电荷转移。平均片材厚度为20-60 nm。与纯BiOCl降解RhB的能力相比，最佳复合材料的降解率在15分钟内可以达到100％，而相应的光电流强度可以达到5.6 µA·cm ^-2。，其阻抗值也最小。活性物质的去除实验表明使得h ⁺和O ² _- 光催化降解过程中发挥重要作用。可以预期，这项工作中得到的复合材料可用作光催化和光电化学应用的潜在材料。