Abstract This work depicts the synthesis of controllable Pd nanoparticles decorated TiO2 nanowire arrays by electrospray technique. By varying the substrate temperature and volume of precursor solution, Pd/TiO2 hybrid structure with different sizes and deposition yield was precisely controlled. The highest photocurrent density of the Pd/TiO2 photoanode was 1.4 mA cm−2 at 1.23 V vs. RHE, which was approximately 5 times higher than the pristine TiO2. The onset potential with a significant cathodic shift of 80 mV compared to the pristine TiO2 was also observed. To the best of our knowledge, the obtained photocurrent showed the optimal photocurrent density and high stability compared with previous reports. It is also found that the photoelectrochemical performance is closely related to the size and deposition quantity of Pd nanoparticles. According to the results, the enhanced PEC performance can be attributed to the Schottky junction, charge transfer and the enhancement about the separation efficiency of the photogenerated electrons and holes betweenTiO2 and Pd NPs. This result demonstrated that this method may design a new and green strategy for synthesizing the well-defined morphologies, compositions, and sizes of the hybrid nanomaterial for photocatalytic hydrogen generation, photocatalytic CO2 reduction and photosynthesis of organic molecules.

中文翻译：

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受控Pd纳米粒子装饰TiO2纳米线阵列对高效光电化学水分解的影响

摘要 这项工作描述了通过电喷雾技术合成可控 Pd 纳米粒子装饰的 TiO2 纳米线阵列。通过改变衬底温度和前驱体溶液的体积，可以精确控制不同尺寸和沉积产率的 Pd/TiO2 混合结构。Pd/TiO2 光阳极的最高光电流密度在 1.23 V vs. RHE 时为 1.4 mA cm-2，大约是原始 TiO2 的 5 倍。还观察到与原始 TiO2 相比具有 80 mV 显着阴极位移的起始电位。据我们所知，与之前的报道相比，获得的光电流显示出最佳的光电流密度和高稳定性。还发现光电化学性能与Pd纳米颗粒的尺寸和沉积量密切相关。根据结果​​，增强的PEC性能可归因于肖特基结、电荷转移以及TiO2和Pd NPs之间光生电子和空穴分离效率的提高。该结果表明，该方法可以设计一种新的绿色策略，用于合成明确定义的混合纳米材料的形态、组成和尺寸，用于光催化产氢、光催化 CO2 还原和有机分子的光合作用。