School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, P. R. China.
School of Material Science and Engineering, University of Jinan, Jinan, 250022, P. R. China.
Adv Mater. 2019 Feb;31(8):e1806596. doi: 10.1002/adma.201806596. Epub 2019 Jan 7.
Rutile titanium dioxide (TiO ) is a promising photocatalyst due to its high thermodynamic stability and few intragrain defects. However, it has not yet achieved photocatalytic activity comparable to that of anatase TiO owing to its higher recombination rate of electron-hole pairs. To effectively separate the electron-hole pairs in rutile TiO , a facet heterojunction (FH) structure to prolong the lifetime of the photogenerated electrons is proposed. Ultrathin TiO nanosheets with different facets are coated in situ onto TiO nanorod (NR) substrates, where FHs are built among the nanosheets as well as between the nanosheets and NR substrates. The as-prepared rutile TiO , with an FH structure (FH-TiO ), serves as an effective photocatalyst for water splitting. More than 45 and 18 times higher photogenerated current density and H production rate, respectively, are obtained compared to those of pure rutile TiO NRs. Moreover, FH-TiO delivers a 0.566 mmol g h H production rate even in pure water. This study offers important insights into the rational design of rutile TiO structures for highly efficient photocatalytic reactions.
锐钛矿型二氧化钛（TiO ）由于其热力学稳定性高且晶粒内缺陷较少，是一种很有前途的光催化剂。然而，由于其电子-空穴对的复合率较高，它尚未达到与锐钛矿型 TiO 相当的光催化活性。为了有效地分离锐钛矿型 TiO 中的电子-空穴对，提出了一种面异质结（FH）结构来延长光生电子的寿命。将具有不同晶面的超薄 TiO 纳米片原位包覆在 TiO 纳米棒（NR）基底上，在纳米片之间以及纳米片与 NR 基底之间构建 FH。所制备的具有 FH 结构的锐钛矿型 TiO （FH-TiO ）可用作水分解的有效光催化剂。与纯锐钛矿型 TiO NR 相比，其光生电流密度和 H 产率分别提高了 45 倍和 18 倍以上。此外，FH-TiO 在纯水中的 H 产率甚至达到了 0.566mmol g h。本研究为高效光催化反应中锐钛矿型 TiO 结构的合理设计提供了重要的见解。
