Construction of Z-scheme photocatalysts has drawn much attention in the field of CO₂ reduction. However, research on photoreduction CO₂ for monoclinic bismuth vanadate (m-BiVO₄) is restricted due to its low conduction band potential and short electron diffusion lengths. To address the issues, we herein constructed a series of CdS/BiVO₄ nanocomposites by depositing CdS on the surface of BiVO₄ coupling with controlling the thickness of BiVO₄ nanosheets. The morphological, crystalline, band alignment and optical properties of the samples are investigated intensively. Photocatalytic performance is evaluated by measuring the ability of the photocatalysts to convert CO₂ into CO and hydrocarbon fuels, primarily CH₄. The composites exhibit more efficient photocatalytic activity than CdS and BiVO₄, and the yields of CH₄ and CO vary depending on the thickness of BiVO₄ substrate. The maximum yields of CH₄ and CO for CdS/BiVO₄ with 55–75 nm BiVO₄ are 2.98 and 1.31 μmol g⁻¹ after 5 h irradiation, while those for its counterpart with 15–30 nm BiVO₄ attain 8.73 and 1.95 μmol g⁻¹, respectively. The enhanced photoactivity of the composites is attributed to the band structure and Z-scheme charge transfer mode. Besides, thinner BiVO₄ nanosheets are confirmed to be favorable for improving the photoreduction CO₂ efficiency due to shorter electron diffusion lengths.

Z-方案光催化剂的构造在CO ₂还原领域引起了很多关注。然而，单斜晶钒酸铋（m -BiVO ₄）的光还原CO ₂研究由于其低的导带电势和短的电子扩散长度而受到限制。为了解决这些问题，我们通过在BiVO ₄的表面上沉积CdS并控制BiVO ₄的厚度，从而构建了一系列的CdS / BiVO ₄纳米复合材料。纳米片。对样品的形态，结晶，能带排列和光学性质进行了深入研究。通过测量光催化剂将CO ₂转化为CO和烃类燃料（主要是CH _4）的能力来评估光催化性能。该复合材料显示出比CdS和BiVO ₄更有效的光催化活性，并且CH ₄和CO的产率随BiVO ₄底物的厚度而变化。照射5 h后，具有55–75 nm BiVO _4的CdS / BiVO ₄的CH ₄和CO的最大产率分别为2.98和1.31μmolg ^-1，而对应的15–30 nm BiVO的CH ₄和CO的最大产率为¹。_图4的样品分别达到8.73和1.95μmolg ^-1。复合材料增强的光活性归因于能带结构和Z型电荷转移模式。此外，由于较短的电子扩散长度，更薄的BiVO ₄纳米片被证实有利于提高光还原CO ₂效率。