Constructing Bi2WO6-decorated TiO2 composite films for photocathodic protection of 304 stainless steel

• 作者: Ming-liang Wang Yuan Lin Yi-ping Lu Na Wei Ting-ju Li
• 来源期刊: 钢铁研究学报（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 1054-1063
• 页数: 10页
• 语种: 英文

摘要

Bi2WO6 nanoplate/TiO2 nanowire and Bi2WO6 nanoflower/TiO2 nanowire composite films were successfully prepared using a hydrothermal method.The results show that the light absorption for Bi2WO6/TiO2 composite films is extended to the visible region after Bi2WO6 nanoplates and nanoflowers are assembled onto TiO2 nanowires.Furthermore,Bi2WO6 nanoflower/TiO2 nano wire composite film exhibits a better absorption property compared to Bi2WO6 nanoplate/TiO2 nanowire film,which is mainly ascribed to the narrower bandgap of Bi2WO6 nanoflower compared to that of Bi2WO6 nanoplate.The photocurrent density for Bi2WO6 nanoflower/TiO2 nanowire and Bi2WO6 nanoplate/TiO2 nanowire composite films can reach 95 and 62.5 μA cm-2,respectively,which are much higher than that obtained for a pure TiO2 nanowire film(25 μA cm-2).Meanwhile,under illumination,the pure TiO2 nanowire,Bi2WO6 nanoplate/TiO2 nanowire and Bi2WO6 nanoflower/TiO2 nanowire films can reduce the potential of the coupled 304 stainless steel in 3.5 wt.％NaCl solution by 299,719 and 739 mV,respectively.Thus,Bi2WO6 nanoflower/TiO2 nanowire film is found to provide the best effective photocathodic protection for 304 stainless steel.This work not only provides an example of shape-dependent photocathodic protection based on Bi2WO6 but also opens up new possibilities to design an ideal microstructure on the basis of semiconductor materials for future applications of photocathodic protection.