National Laboratory of Solid State Microstructures, Department of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China. Jiangsu Key Laboratory for Nano Technology, Nanjing University, Nanjing 210093, People's Republic of China. Eco-materials and Renewable Energy Research Center (ERERC), Nanjing University, Nanjing 210093, People's Republic of China.
Nanotechnology. 2017 Jul 7;28(27):274002. doi: 10.1088/1361-6528/aa6bb5.
An all-solid-state BiWO/Au/CdS Z-scheme system was constructed for the photocatalytic reduction of CO into methane in the presence of water vapor. This Z-scheme consists of ultrathin BiWO nanoplates and CdS nanoparticles as photocatalysts, and a Au nanoparticle as a solid electron mediator offering a high speed charge transfer channel and leading to more efficient spatial separation of electron-hole pairs. The photo-generated electrons from the conduction band (CB) of BiWO transfer to the Au, and then release to the valence band (VB) of CdS to recombine with the holes of CdS. It allows the electrons remaining in the CB of CdS and holes in the VB of BiWO to possess strong reduction and oxidation powers, respectively, leading the BiWO/Au/CdS to exhibit high photocatalytic reduction of CO, relative to bare BiWO, BiWO/Au, and BiWO/CdS. The depressed hole density on CdS also enhances the stability of the CdS against photocorrosion.
构建了一种全固态 BiWO/Au/CdSZ 型体系，用于在水蒸气存在下光催化还原 CO 生成甲烷。该 Z 型体系由超薄的 BiWO 纳米片和 CdS 纳米颗粒作为光催化剂，以及 Au 纳米颗粒作为固体电子介体组成，提供了高速电荷转移通道，导致电子-空穴对更有效地空间分离。BiWO 的导带 (CB) 中的光生电子转移到 Au，然后释放到 CdS 的价带 (VB) 中，与 CdS 的空穴复合。这使得留在 CdS 的 CB 中的电子和 BiWO 的 VB 中的空穴分别具有很强的还原和氧化能力，从而使 BiWO/Au/CdS 相对于裸 BiWO、BiWO/Au 和 BiWO/CdS 表现出更高的 CO 光催化还原性能。CdS 上的空穴密度降低也增强了 CdS 对光腐蚀的稳定性。
