Wei Xueling, Ma Zhen, Yang Yuanhao, Li Qiujie, Sun Qian, Zhang Dekai, Liu Enzhou, Miao Hui
School of Physics, Northwest University, Xi'an, Shaanxi 710127, PR China.
School of Chemical Engineering, Northwest University, Xi'an, Shaanxi 710127, PR China.
Langmuir. 2024 Nov 5;40(44):23491-23500. doi: 10.1021/acs.langmuir.4c03156. Epub 2024 Oct 21.
Constructing high catalytic activity heterojunctions to compensate for the shortcomings of single catalysts has promoted the development of semiconductor catalysts in photoelectrochemical (PEC) water splitting. In this case, the 2D/2D BiOS/CdS composite was successfully constructed by an in situ surface epitaxial growth method. At 1.23 V vs RHE, the catalytic activity of BiOS/CdS with a 2D/2D heterojunction is the highest, and the current density of the BiOS/CdS photoanode is 3.46 mA/cm. Compared with the BiOS photoanode (0.59 mA/cm), the performance has been improved by 5.86 times. In electrochemical impedance spectroscopy testing, the arc radius of 2D/2D BiOS/CdS is smaller than that of BiOS, indicating faster charge-transfer kinetics. The data show that the 2D/2D heterojunction with surface-surface contact successfully enhances the catalytic activity of BiOS, greatly elevating the efficiency of charge separation and migration. This study provides a method to enhance the PEC activity in type-I heterojunction photoelectrodes, promoting the application of BiOS-based materials in photoelectrochemistry.
构建具有高催化活性的异质结以弥补单一催化剂的不足，推动了半导体催化剂在光电化学（PEC）水分解领域的发展。在此情况下，通过原位表面外延生长法成功构建了二维/二维BiOS/CdS复合材料。相对于可逆氢电极（RHE）在1.23 V时，具有二维/二维异质结的BiOS/CdS催化活性最高，BiOS/CdS光阳极的电流密度为3.46 mA/cm²。与BiOS光阳极（0.59 mA/cm²）相比，性能提高了5.86倍。在电化学阻抗谱测试中，二维/二维BiOS/CdS的弧半径小于BiOS，表明电荷转移动力学更快。数据表明，具有表面-表面接触的二维/二维异质结成功提高了BiOS的催化活性，极大地提高了电荷分离和迁移效率。本研究提供了一种提高I型异质结光电极PEC活性的方法，推动了基于BiOS的材料在光电化学中的应用。
