Wang Yuting, Li Runhua, Zhang Jiaying, Liu Liming, Huang Weiwei, Wang Yajun
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.
Nanomaterials (Basel). 2024 Mar 6;14(5):477. doi: 10.3390/nano14050477.
Photoelectric catalysis is a green and efficient way to degrade pollutants, which has been paid more and more attention by researchers. Among them, BiWO has been proved to have excellent photocatalytic oxidation activity on its {001} facets. In this study, {001}-oriented facets with high exposure were successfully integrated into BiWO nanoplate arrays (BiWO NAs) to create a photoelectrode. This structure was grown in situ on an indium tin oxide (ITO) substrate. To promote photogenerated carrier separation efficiency and reduce agglomeration of BiWO photocatalysts, the electrochemical deposition of NiFe-layered double hydroxide (NiFe-LDH) and TiC (MXene) were introduced in this research to synergistically catalyze pollutant degradation. Morphology, spectral characterization, and electrochemical analysis jointly confirmed that the outstanding performance of hole capture behavior with LDH and electron conduction properties with MXene were the main reasons for the improvement in catalytic activity of the photoelectrode. Taking bisphenol A (BPA) as the model pollutant, the rate constant of the NiFe-LDH/TiC/BiWO NAs photoelectrode reaches 0.00196 min under photoelectrocatalytic (PEC) conditions, which is 4.5 times that of the pure BiWO NAs photoelectrode. This work provides a new way to improve the reaction kinetics of the PEC degradation of pollutants.
光电催化是一种绿色高效的污染物降解方法，受到了研究人员越来越多的关注。其中，BiWO已被证明在其{001}晶面上具有优异的光催化氧化活性。在本研究中，将高暴露的{001}取向晶面成功整合到BiWO纳米片阵列（BiWO NAs）中以制备光电极。这种结构在氧化铟锡（ITO）衬底上原位生长。为了提高光生载流子的分离效率并减少BiWO光催化剂的团聚，本研究引入了镍铁层状双氢氧化物（NiFe-LDH）和TiC（MXene）的电化学沉积以协同催化污染物降解。形貌、光谱表征和电化学分析共同证实，LDH出色的空穴捕获行为和MXene的电子传导特性是光电极催化活性提高的主要原因。以双酚A（BPA）作为模型污染物，NiFe-LDH/TiC/BiWO NAs光电极在光电催化（PEC）条件下的速率常数达到0.00196 min，是纯BiWO NAs光电极的4.5倍。这项工作为提高PEC降解污染物的反应动力学提供了一种新方法。
