Unravelling the Efficient Photocatalytic Activity of Boron-induced Ti3+ Species in the Surface Layer of TiO2
Unravelling the Efficient Photocatalytic Activity of Boron-induced Ti3+ Species in the Surface Layer of TiO2
复制标题
揭示 TiO2 表面层中硼诱导的 Ti3 物质的高效光催化活性
DOI：
10.1038/srep34765
复制
发表时间：
2016-10-06
影响因子：
4.6
通讯作者：
Deng, Feng
中科院分区：
文献类型：
--
作者：
Feng, Ningdong;Liu, Fen;Deng, Feng
Ti3+物质在空气中非常不稳定，因为它们很容易氧化成Ti4+物质，因此它们不能集中在TiO2的表面层，而是主要存在于TiO2的本体中。我们报道了通过硼掺杂在 TiO2 表面层产生丰富且稳定的 Ti3+ 物质，以有效利用太阳辐射。所得光催化剂（表示为 B-TiO2−x）表现出极高且稳定的太阳能驱动光催化产氢活性。 B-TiO2−x 光催化剂中太阳光活性增强的起源已通过各种实验技术和密度泛函理论 (DFT) 计算进行了彻底研究。足够的间隙硼原子的存在所引起的独特结构可以导致B-TiO2−x态密度的显着变化，这不仅显着缩小TiO2的带隙以提高其可见光吸收，而且还可以促进光生电子迁移率以增强其太阳光光催化活性。
Ti3+species are highly unstable in air owing to their facile oxidation into Ti4+species, and thus they cannot concentrate in the surface layer of TiO2but are mainly present in its bulk. We report generation of abundant and stable Ti3+species in the surface layer of TiO2by boron doping for efficient utilization of solar irradiation. The resultant photocatalysts (denoted as B-TiO2−x) exhibit extremely high and stable solar-driven photocatalytic activity toward hydrogen production. The origin of the solar-light activity enhancement in the B-TiO2−xphotocatalysts has been thoroughly investigated by various experimental techniques and density functional theory (DFT) calculations. The unique structure invoked by presence of sufficient interstitial boron atoms can lead to substantial variations in density of states of B-TiO2−x, which not only significantly narrow the band gap of TiO2to improve its visible-light absorption, but also promote the photogenerated electron mobility to enhance its solar-light photocatalytic activity.