通过水热反应、化学镀和枝化生长三个步骤，制备了具有层级特征的异质型CuO@TiO2纳米线膜。研究表明，CuO@TiO2纳米线膜表现出了众多适合光电解水应用的优异物理特性，如层级表面、拓展的光学吸收范围、快速的界面电荷转移能力等。在可见光照和1.0 V偏压(相对可逆氢电极)条件下，未修饰的TiO2纳米线膜产生的光电流密度为0.12 mA/cm2。CuO@TiO2纳米线膜在相同条件下产生的光电流密度为0.56 mA/cm2。而且，计时电流法研究表明CuO@TiO2纳米线膜具有良好的稳定性。因此，所制备的CuO@TiO2纳米线膜是潜在的太阳能光电解水阳极材料。
A new kind of self-standing CuO@TiO2 nanowires (NWs) film with hierarchical feature was prepared by a three-step protocol consisting of hydrothermal reaction, electroless plating, and branched growth processes. This heterostructured CuO@TiO2 NWs film demonstrates the favorable physical properties in the photoelectrochemical cell (PEC) water splitting, such as the hierarchical surface, the extended optical absorption range, and the rapid interface charge transfer kinetics. Under the illumination of the simulated solar light, the pristine TiO2 NWs film only attains a photocurrent density of 0.12 mA/cm2 at 1.0 V versus reversible hydrogen electrode (RHE). Significantly, the CuO@TiO2 NWs film can yield a dramatically increased photocurrent density of 0.56 mA/cm2 at the same applied voltage. Furthermore, amperometric I?t tests of the CuO@TiO2 NWs film reveal satisfactory stability. All the above characteristics of this heterostructured CuO@TiO2 NWs film indicate its great potential in the water splitting applications with solar visible light.
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