Nitrogen Vacancy-Promoted Photocatalytic Activity of Graphitic Carbon Nitride

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	Nitrogen Vacancy-Promoted Photocatalytic Activity of Graphitic Carbon Nitride
	P. Niu; G. Liu; H. M. Cheng
	2012
发表期刊	Journal of Physical Chemistry C
ISSN	1932-7447
卷号	116 期号:20 页码:11013-11018
摘要	Vacancy defects can play an important role in modifying the electronic structure and the properties of photoexcited charge carriers and consequently the photocatalytic activity of semiconductor photocatalysts. By controlling the polycondensation temperature of a dicyandiamide precursor in the preparation of graphitic carbon nitride (g-C3N4), we introduced nitrogen vacancies in the framework of g-C3N4. These vacancies exert remarkable effects on modifying the electronic structure of g-C3N4 as shown in UV-visible absorption spectra and valence band spectra. Steady and time-resolved fluorescence emission spectra show that, due to the existence of abundant nitrogen vacancies, the intrinsic radiative recombination of electrons and holes in g-C3N4 is greatly restrained, and the population of short-lived and long-lived charge carriers is decreased and increased, respectively. As a consequence, the overall photocatalytic activity of the g-C3N4, characterized by the ability to generate center dot OH radicals, photodecomposition of Rhodamine B, and photocatalytic hydrogen evolution under both UV-visible and visible light, was remarkably improved.
部门归属	[niu, ping; liu, gang; cheng, hui-ming] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;liu, g (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china.;gangliu@imr.ac.cn
关键词	Visible-light Photocatalysis Metal-free Catalysts Tio2-based Photocatalysts Hydrogen-production Chemical-synthesis Water Irradiation Chemistry Polymer G-c3n4
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60175
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	P. Niu,G. Liu,H. M. Cheng. Nitrogen Vacancy-Promoted Photocatalytic Activity of Graphitic Carbon Nitride[J]. Journal of Physical Chemistry C,2012,116(20):11013-11018.
APA	P. Niu,G. Liu,&H. M. Cheng.(2012).Nitrogen Vacancy-Promoted Photocatalytic Activity of Graphitic Carbon Nitride.Journal of Physical Chemistry C,116(20),11013-11018.
MLA	P. Niu,et al."Nitrogen Vacancy-Promoted Photocatalytic Activity of Graphitic Carbon Nitride".Journal of Physical Chemistry C 116.20(2012):11013-11018.