In this work, we report a bismuth oxide film electrode with oxygen defects and honeycomb multilevel structure prepared by one-step hydrothermal method. The control of raw materials enables to control the thickness and morphology of BiO electrodes. The photoelectrocatalytic of prepared electrodes were tested in various conditions. Under visible light irradiation (λ ≥ 420 nm) and 3 V bias, the sample BiO-2 has the highest photoelectrocatalytic activity, which is 4.95 times higher than the photocatalytic activity and 9.86 times higher than the electrocatalytic activity. The oxygen defects of bismuth oxide were confirmed by EPR and DFT calculation. The morphology and structure of prepared samples were tested by XRD, scanning electronic microscope (SEM), high-resolution transmission electron microscope (HRTEM) and X-ray photoelectron spectroscopy (XPS). The enhanced photoelectrocatalytic activity is attributed to the proper bias voltage, oxygen defects, and honeycomb multilevel structure. The results of tapping experiments showed that the main active species during the photoelectrocatalytic progress is superoxide radical and the mechanism of the photoelectrocatalysis was proposed.

在这项工作中，我们报告了一种通过一步水热法制备的具有氧缺陷和蜂窝状多级结构的氧化铋薄膜电极。原材料的控制能够控制BiO电极的厚度和形态。在各种条件下测试了制备电极的光电催化性能。在可见光（λ≥420 nm）和3 V偏压下，样品BiO-2具有最高的光电催化活性，比光电催化活性高4.95倍，比电催化活性高9.86倍。通过EPR和DFT计算证实了氧化铋的氧缺陷。用XRD，扫描电子显微镜（SEM），高分辨率透射电子显微镜（HRTEM）和X射线光电子能谱（XPS）对制备的样品的形貌和结构进行了测试。增强的光电催化活性归因于适当的偏置电压，氧缺陷和蜂窝状多级结构。窃听实验的结果表明，在光电催化过程中主要的活性物种是超氧自由基，并提出了光电催化的机理。