Wang Jianqiang, Wang Xia, Cui Zhentao, Liu Bing, Cao Minhua
Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Department of Chemistry, Beijing Institute of Technology, Beijing 100081, P. R. China.
Phys Chem Chem Phys. 2015 Jun 7;17(21):14185-92. doi: 10.1039/c5cp01199j. Epub 2015 May 11.
Herein, rhombohedral self-doped KNbO3 (S-KN) nanorods were fabricated via a one pot, solvothermal method without using any surfactant. The presence of Nb(4+) in S-KN greatly narrows its band gap and thus extends its photoresponse from UV to the visible light region. Moreover, S-KN/Nb4N5 nanorod heterostructures were obtained by nitriding S-KN nanorods for different times, which exhibited significantly enhanced photocatalytic activity for hydrogen production under visible light irradiation. The junction formed between S-KN and Nb4N5 and the Nb(4+) self-doping of KN are supposed to be responsible for the enhanced photocatalytic activity of S-KN/Nb4N5. This study also paves the way for the synthesis of other similar photocatalysts.
在此，通过一锅法溶剂热法制备了菱面体自掺杂的KNbO₃（S-KN）纳米棒，未使用任何表面活性剂。S-KN中Nb(4+)的存在极大地缩小了其带隙，从而将其光响应从紫外光区域扩展到可见光区域。此外，通过对S-KN纳米棒进行不同时间的氮化处理，获得了S-KN/Nb₄N₅纳米棒异质结构，其在可见光照射下对产氢表现出显著增强的光催化活性。S-KN和Nb₄N₅之间形成的结以及KN的Nb(4+)自掺杂被认为是S-KN/Nb₄N₅光催化活性增强的原因。该研究也为合成其他类似的光催化剂铺平了道路。
