Chen Yingzhi, Jiang Dongjian, Li Ling, Li Zhen, Li Qinglin, Shi Ranran, Li Jingyuan, Wang Lu-Ning
Nanotechnology. 2020 Apr 24;31(17):174002. doi: 10.1088/1361-6528/ab6232. Epub 2019 Dec 16.
Interfacial heterostructuring has appeared to be an efficient strategy to address the efficiency and applicability of the photocatalysts in solar energy conversion. Herein, we developed one-dimensional (1D) α-FeO/TiO nanoheterojunction arrays for enhanced photoelectrochemical (PEC) activity. α-FeO nanotubes were firstly prepared via anodization under controlled hydrodynamic conditions to increase the efficiency. 1D α-FeO/TiO nanoheterojunction arrays were then prepared through a hydrothermal treatment and a subsequent annealing process. A controlled anodization by modulating the hydrodynamic conditions, added a fine coating of TiO overlayer, to finally give an optimized composition and geometry for improved light absorption and spatial charge separation efficiency. Consequently, the optimized α-FeO generated a photocurrent of 0.07 mA cm (3.5 times higher than that of pristine α-FeO), and the as-obtained α-FeO/TiO nanoheterojunction exhibited a photocurrent intensity of 0.12 mA cm (about 6 times higher than that of pristine α-FeO). A long-term stability can also be ensured. The well-controlled architectures provides a guideline for synthesis of advanced nanomaterials.
界面异质结构已成为一种有效策略，可解决光催化剂在太阳能转换中的效率和适用性问题。在此，我们开发了一维（1D）α-FeO/TiO纳米异质结阵列，以增强光电化学（PEC）活性。首先通过在可控的流体动力学条件下进行阳极氧化制备α-FeO纳米管，以提高效率。然后通过水热处理和随后的退火工艺制备一维α-FeO/TiO纳米异质结阵列。通过调节流体动力学条件进行可控阳极氧化，添加了一层精细的TiO覆盖层，最终获得了优化的组成和几何结构，以提高光吸收和空间电荷分离效率。因此，优化后的α-FeO产生了0.07 mA cm的光电流（比原始α-FeO高3.5倍），所制备的α-FeO/TiO纳米异质结的光电流强度为0.12 mA cm（约为原始α-FeO的6倍）。还可以确保长期稳定性。这种精确控制的结构为先进纳米材料的合成提供了指导。
