Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P.R. China.
School of Materials Science and Engineering, University of Science and Technology of China, 72 Wenhua Road, Shenyang, 110016, P.R. China.
Chemistry. 2019 Feb 1;25(7):1787-1794. doi: 10.1002/chem.201805283. Epub 2019 Jan 2.
The strong band-to-band absorption of photocatalysts spanning the whole visible-light region (400-700 nm) is critically important for solar-driven photocatalysis. Although it has been actively and widely used as a photocatalyst for various reactions in the past four decades, TiO has a very poor ability to capture the whole spectrum of visible light. In this work, by controlling the spatially homogeneous distribution of boron and nitrogen heteroatoms in anatase TiO microspheres with a predominance of high-energy {001} facets, a strong visible-light absorption spectrum with a sharp edge beyond 680 nm has been achieved. The red TiO obtained with homogeneous doping of boron and nitrogen shows no increase in defects like Ti that are commonly observed in doped TiO . More importantly, it has the ability to induce photocatalytic water oxidation to produce oxygen under the irradiation of visible light beyond 550 nm and also the photocatalytic reduction of water to produce hydrogen under visible light. These results demonstrate the great promise of using red TiO for visible-light photocatalytic water splitting and also reveal an attractive strategy for realizing the wide-spectrum visible-light absorption of wide-band-gap oxide photocatalysts.
光催化剂在整个可见光区域（400-700nm）的强带间吸收对于太阳能驱动的光催化至关重要。尽管 TiO 在过去四十年中作为各种反应的光催化剂被广泛应用，但它捕获整个可见光光谱的能力非常差。在这项工作中，通过控制锐钛矿 TiO 微球中硼和氮杂原子的空间均匀分布，具有超过 680nm 的尖锐边缘的强可见光吸收光谱得以实现。用硼和氮均匀掺杂得到的红色 TiO 没有像通常在掺杂 TiO 中观察到的 Ti 那样的缺陷增加。更重要的是，它具有在 550nm 以上的可见光照射下诱导光催化水氧化产生氧的能力，也具有在可见光下光催化还原水产生氢的能力。这些结果表明，使用红色 TiO 进行可见光光催化水分解具有很大的前景，并揭示了实现宽带隙氧化物光催化剂宽光谱可见光吸收的有吸引力的策略。
