Department of Materials Science and Engineering, Ajou University, Suwon 443-739, Republic of Korea.
Department of Materials Science and Engineering, Ajou University, Suwon 443-739, Republic of Korea; Department of Energy Systems Research, Ajou University, Suwon 443-739, Republic of Korea.
J Colloid Interface Sci. 2018 Jan 1;509:440-447. doi: 10.1016/j.jcis.2017.09.025. Epub 2017 Sep 8.
Doping WO with foreign atoms is a very efficient strategy to modify the structural, optical and electronic properties which could influence its photoelectrochemical (PEC) water splitting activity. In this study, we report a simple and efficient single-step strategy for the fabrication of molybdenum (Mo)-doped WO thin films. The characterization results show that doping Mo into WO leads to a significant change in the morphology without changing its crystal structure. Elemental mapping and EDS analysis revealed that Mo was homogeneously doped into the crystal lattice of WO in the at.% range of 0-10.31. The incorporation of Mo into WO reduced the band-gap of WO and increased its light absorption ability. Notably, X-ray photoelectron spectroscopic valence band-edge analysis confirmed that substitution of Mo into WO led to a downward shift in the conduction band minimum without any significant change in the valence band maximum with respect to Fermi level. The fabricated Mo-doped WO electrodes exhibited a higher photocurrent compared to undoped WO samples under simulated 1.5AM sunlight without the addition of a water oxidation catalyst. The procedure proposed herein provides a simple and systematic approach for the fabrication of band-gap-tailored WO photoanodes by Mo doping for efficient PEC water splitting.
用外来原子掺杂 WO 是一种非常有效的策略，可以改变其结构、光学和电子性质，从而影响其光电化学（PEC）水分解活性。在本研究中，我们报告了一种简单而有效的单步策略，用于制备钼（Mo）掺杂 WO 薄膜。表征结果表明，掺杂 Mo 会导致 WO 的形态发生显著变化，而不会改变其晶体结构。元素映射和 EDS 分析表明，Mo 以原子百分比为 0-10.31 的范围均匀地掺杂到 WO 的晶格中。Mo 掺入 WO 降低了 WO 的能带隙并提高了其光吸收能力。值得注意的是，X 射线光电子能谱价带边缘分析证实，Mo 取代 WO 导致导带最小值向下移动，而费米能级相对于价带最大值没有明显变化。与未掺杂 WO 样品相比，在没有添加水氧化催化剂的情况下，在模拟的 1.5AM 阳光下，制备的 Mo 掺杂 WO 电极表现出更高的光电流。本文提出的方法为通过 Mo 掺杂制备带隙可调 WO 光阳极提供了一种简单而系统的方法，以实现高效的 PEC 水分解。
