Creation of Cu2O@TiO2 Composite Photocatalysts with p-n Heterojunctions Formed on Exposed Cu2O Facets, Their Energy Band Alignment Study, and Their Enhanced Photocatalytic Activity under Illumination with Visible Light

IMR OpenIR

	Creation of Cu2O@TiO2 Composite Photocatalysts with p-n Heterojunctions Formed on Exposed Cu2O Facets, Their Energy Band Alignment Study, and Their Enhanced Photocatalytic Activity under Illumination with Visible Light
	L. M.; Yang Liu, W. Y.; Sun, W. Z.; Li, Q.; Shang, J. K.
	2015
发表期刊	Acs Applied Materials & Interfaces
ISSN	1944-8244
卷号	7 期号:3 页码:1465-1476
摘要	The creation of photocatalysts with controlled facets has become an important approach to enhance their activity. However, how the formation of heterojunctions on exposed facets could affect their photocatalytic performance ranking had not yet been investigated. In this study, Cu2O@TiO2 core-shell structures were created, and Cu2O/TiO2 p-n heterojunctions were formed on various exposed facets of Cu2O cubes, Cu2O cuboctahedra, and Cu2O octahedra, respectively. These Cu2O@TiO2 polyhedra demonstrated an enhanced photocatalytic degradation effect on Methylene Blue (MB) and 4-nitrophenol (4-NP) under visible light illumination, because of the enhanced charge carrier separation by the formation of Cu2O@TiO2 p-n heterojunctions. It was further found that their photocatalytic performance was also facet-dependent as pure Cu2O polyhedra, while the photocatalytic performance ranking of these Cu2O@TiO2 polyhedra was different with that of their corresponding Cu2O polyhedron cores. By the combination of optical property measurement and XPS analysis, the energy band alignments of these Cu2O@TiO2 polyhedra were determined, which demonstrated that Cu2O@TiO2 octahedra had the highest band offset for the separation of charge carriers. Thus, the charge-carrier-separation-driven force in Cu2O@TiO2 polyhedra was different from their corresponding Cu2O polyhedron cores, which resulted in their different surface photovoltage spectrum (SPS) responses and different photocatalytic performance rankings.
部门归属	[liu, lingmei ; yang, weiyi ; sun, wuzhu ; li, qi ; shang, jian ku] chinese acad sci, inst met res, shenyang natl lab mat sci, environm funct mat div, shenyang 110016, peoples r china. [shang, jian ku] univ illinois, dept mat sci & engn, urbana, il 61801 usa. ; li, q (reprint author), 72 wenhua rd, shenyang 110016, liaoning, peoples r china. ; qili@imr.ac.cn
关键词	Cu2o@tio2 Polyhedra Exposed Facets P-n Heterojunctions Energy Band Alignment Visible Light Photocatalytic Activity Catalytic Memory Shape Evolution Porous Nickel Tio2 Degradation Crystals Water Nanocrystals Nanostructures Nanoparticles
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73865
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. M.,Yang Liu, W. Y.,Sun, W. Z.,et al. Creation of Cu2O@TiO2 Composite Photocatalysts with p-n Heterojunctions Formed on Exposed Cu2O Facets, Their Energy Band Alignment Study, and Their Enhanced Photocatalytic Activity under Illumination with Visible Light[J]. Acs Applied Materials & Interfaces,2015,7(3):1465-1476.
APA	L. M.,Yang Liu, W. Y.,Sun, W. Z.,Li, Q.,&Shang, J. K..(2015).Creation of Cu2O@TiO2 Composite Photocatalysts with p-n Heterojunctions Formed on Exposed Cu2O Facets, Their Energy Band Alignment Study, and Their Enhanced Photocatalytic Activity under Illumination with Visible Light.Acs Applied Materials & Interfaces,7(3),1465-1476.
MLA	L. M.,et al."Creation of Cu2O@TiO2 Composite Photocatalysts with p-n Heterojunctions Formed on Exposed Cu2O Facets, Their Energy Band Alignment Study, and Their Enhanced Photocatalytic Activity under Illumination with Visible Light".Acs Applied Materials & Interfaces 7.3(2015):1465-1476.