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 nanowire 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.

采用水热法成功制备了Bi ₂ WO ₆纳米板/ TiO ₂纳米线和Bi ₂ WO ₆纳米花/ TiO ₂纳米线复合膜。结果表明，Bi ₂ WO ₆纳米板和纳米花组装在TiO ₂纳米线上后，Bi ₂ WO ₆ / TiO ₂复合膜的光吸收扩展到可见区。此外，Bi ₂ WO ₆纳米花/ TiO ₂纳米线复合膜与Bi ₂相比具有更好的吸收性能。WO ₆纳米板/的TiO ₂纳米线膜，它主要归因于Bi的窄的带隙₂ WO ₆纳米花相比的Bi ₂ WO ₆纳米板。Bi ₂ WO ₆纳米花/ TiO ₂纳米线和Bi ₂ WO ₆纳米板/ TiO ₂纳米线复合膜的光电流密度分别可以达到95和62.5μAcm ^-2，远高于纯TiO ₂纳米线获得的光电流密度。膜（25μAcm ^-2）。同时，在光照下，纯TiO ₂纳米线，Bi ₂ WO ₆纳米板/ TiO ₂纳米线和Bi ₂ WO ₆纳米花/ TiO ₂纳米线膜可以将耦合的304不锈钢在3.5 wt。％NaCl溶液中的电位分别降低299、719和739 mV。因此，发现Bi ₂ WO ₆纳米花/ TiO ₂纳米线薄膜可为304不锈钢提供最佳的有效阴极保护。这项工作不仅提供了一个基于Bi ₂ WO ₆的形状依赖性光阴极保护的例子。 但也为基于光电子保护的未来应用的半导体材料设计理想的微结构提供了新的可能性。