A novel nanocomposite with ZnO nanorod arrays vertically growing on the three-dimensional (3D) Ni foam has been synthesized under hydrothermal conditions, which displays both the piezoelectric and photocatalytic functions. When the solution is stirred by magnetic rotation, fluid eddies are produced within the unique macroporous structure in 3D network, causing deformation of ZnO nanorod to generate piezoelectric field. Meanwhile, UV light irradiation on ZnO semiconductor generates photoelectrons and holes, followed by starting photocatalytic degradation of organic dye pollutants in wastewater. The piezo-induced bias voltage promotes the separation of photoelectrons and holes and thus can inhibit their recombination, leading to the enhanced quantum efficiency (more than 5 times). The photocatalytic activity increased by increasing the stirring rate owing to the enhanced piezoelectric field.

中文翻译：

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ZnO纳米棒阵列/3D泡沫镍上流体涡诱导压电促进废水中有机染料污染物的光降解

在水热条件下合成了一种具有垂直生长在三维（3D）泡沫镍上的 ZnO 纳米棒阵列的新型纳米复合材料，该复合材料具有压电和光催化功能。当溶液受到磁力旋转搅拌时，在独特的 3D 网络大孔结构内产生流体涡流，使 ZnO 纳米棒变形产生压电场。同时，紫外光照射在 ZnO 半导体上产生光电子和空穴，随后开始光催化降解废水中的有机染料污染物。压电感应偏置电压促进了光电子和空穴的分离，从而抑制了它们的复合，从而提高了量子效率（超过 5 倍）。