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LiNbO3不同晶面的光催化产氢性能
引用本文:宋琰,李朝升,邹志刚.LiNbO3不同晶面的光催化产氢性能[J].无机化学学报,2013,29(18).
作者姓名:宋琰  李朝升  邹志刚
作者单位:南京大学物理学院, 南京 210093;南京大学现代工程与应用科学学院, 南京大学环境材料与再生能源研究中心, 固体微结构国家重点实验室, 南京 210093;南京大学物理学院, 南京 210093;南京大学现代工程与应用科学学院, 南京大学环境材料与再生能源研究中心, 固体微结构国家重点实验室, 南京 210093;南京大学昆山创新研究院, 昆山 215347
基金项目:国家重点基础研究发展计划(973计划,No.2013CB632404,2014CB239303)、国家自然基金(No.51272102,21073090,51272101)资助项目。
摘    要:研究了LiNbO3(001)、(100)和(110)晶面的光催化产氢性能。(001)、(100)和(110)3个晶面光催化产氢性能之比为7.8:1.3:1.0。LiNbO3001]晶向存在电偶极矩和自发极化,有利于增加光生电子和空穴的分离效率,减少光生电子和空穴的复合,提高LiNbO3(001)面的光催化活性。LiNbO3(001)面的空穴有效质量最小,有利于光生空穴的迁移,从而减少光生电子和空穴的复合,也有利于光催化性能的提高。

关 键 词:催化  光催化产氢  LiNbO3  晶面

Anisotropy in Photocatalytic Hydrogen Evolution of LiNbO3 (001), (100) and (110) Faces
SONG Yan,LI Zhao-Sheng and ZOU Zhi-Gang.Anisotropy in Photocatalytic Hydrogen Evolution of LiNbO3 (001), (100) and (110) Faces[J].Chinese Journal of Inorganic Chemistry,2013,29(18).
Authors:SONG Yan  LI Zhao-Sheng and ZOU Zhi-Gang
Institution:Department of Physics, Nanjing University, Nanjing 210093, China;College of Engineering and Applied Sciences, Eco-Materials and Renewable Energy Research Center, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;Department of Physics, Nanjing University, Nanjing 210093, China;College of Engineering and Applied Sciences, Eco-Materials and Renewable Energy Research Center, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;Kunshan Innovation Institute of Nanjing University, Kunshan, Jiangsu 215347, China
Abstract:Aremarkable difference in photocatalytic activity for H2 production over LiNbO3 (001), (100) and (110) faces is reported. LiNbO3 crystal faces follow the reactivity order of (001) >(100) >(110) for photocatalytic hydrogen evolution, and the ratio of photocatalytic hydrogen evolution performance for faces (001), (100), (110) is 7.8:1.3:1.0. The electric dipole moment and spontaneous polarization exist along 001] of LiNbO3, thus increasing the separation efficiency of photogenerated carriers, depressing their recombination, and improving the activity for photocatalytic hydrogen evolution. Also, the effective mass of hole for LiNbO3 (001) is much less than those for LiNbO3 (100) and (110), which favors the mobility of photogenerated holes and cuts down the recombination of photogenerated carriers. Therefore, LiNbO3 (001) exhibits the best activity for photocatalytic hydrogen evolution among these samples.
Keywords:catalysis  photocatalytic H2 evolution  LiNbO3  crystal face
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