Yu Xin, Li Wei, Huang Jian, Li Zhonghua, Liu Jiawen, Hu PingAn
Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, Harbin Institute of Technology, Harbin 150001, P. R. China.
Dalton Trans. 2018 Feb 6;47(6):1948-1957. doi: 10.1039/c7dt04371f.
Superstructured mesocrystalline TaO nanosheets were successfully prepared from mesocrystalline (NH)TaOF nanorods by the annealing method for the first time. The as-prepared mesocrystalline TaO nanosheets in this work showed remarkable visible light absorption, mainly due to the formation of oxygen vacancy defects in the mesocrystalline TaO nanosheets, which was also confirmed by XPS spectra, Raman spectra and EPR spectra. Besides, the mesocrystalline TaO nanosheets showed a highly enhanced photocatalytic activity of 11 268.24 μmol g h, about 3.95 times that of commercial TaO. Moreover, the specific surface area of the mesocrystalline TaO-800 nanosheets was 16.34 m g, about 5.32 times that of the commercial TaO (3.072 m g). The valence band XPS spectra indicated a strong oxidizing ability of the mesocrystalline TaO nanosheets in comparison to that of commercial TaO. The formation of superstructured TaO mesocrystals generated long lifetime carriers and effective conduction pathways, which greatly enhanced the photocatalytic activity for hydrogen production.
首次通过退火法由介晶（NH）TaOF纳米棒成功制备出超结构介晶TaO纳米片。本工作中制备的介晶TaO纳米片表现出显著的可见光吸收，这主要归因于介晶TaO纳米片中氧空位缺陷的形成，XPS光谱、拉曼光谱和EPR光谱也证实了这一点。此外，介晶TaO纳米片表现出高度增强的光催化活性，为11268.24 μmol g h，约为商用TaO的3.95倍。而且，介晶TaO-800纳米片的比表面积为16.34 m g，约为商用TaO（3.072 m g）的5.32倍。价带XPS光谱表明，与商用TaO相比，介晶TaO纳米片具有很强的氧化能力。超结构TaO介晶的形成产生了长寿命载流子和有效的传导途径，极大地增强了产氢的光催化活性。
