Hollow CaTiO3 cubes modified by La/Cr co-doping for efficient photocatalytic hydrogen production

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	Hollow CaTiO3 cubes modified by La/Cr co-doping for efficient photocatalytic hydrogen production
	Wang, RN; Ni, S; Liu, G; Xu, XX; Xu, XX (reprint author), Tongji Univ, Shanghai Key Lab Chem Assessment & Sustainabil, Sch Chem Sci & Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China.
	2018-06-05
发表期刊	APPLIED CATALYSIS B-ENVIRONMENTAL
ISSN	0926-3373
卷号	225 页码:139-147
摘要	In this work, we have applied microstructure management and doping techniques to conventional wide band gap semiconductor CaTiO3 with the aim to improve its light absorption and photocatalytic activity. A series of La/Cr co-doping hollow CaTiO3 cubes have been successfully prepared by a template-free hydrothermal method. Their crystal structures, microstructures, optical absorption and photocatalytic hydrogen production have been systematically investigated. Our results suggest that hollow CaTiO3 owns a higher light absorption than solid one and demonstrates a much better photocatalytic activity both under full range (lambda >= 250 nm) and visible light illumination (lambda >= 400 nm). These improvements probably originate from the peculiar hollow microstructures that increase photon-matter interactions and shorten the charge migration pathways. The photocatalytic activity for hydrogen production has been further studied by varying the La/Cr content in CaTiO3. An optimal doping point at 5% La/Cr doping level has been reached for full range illumination with apparent quantum efficiency approaching similar to 2.41%. Nevertheless, the activity under visible light illumination shows a clear dependence on doping level with highest apparent quantum efficiency similar to 0.40% at 20% La/Cr doping level. DFT calculations reveal the critical role of Cr in forming a new spin-polarized valence band inside the original band gap of CaTiO3 therefore is responsible for band gap reduction and visible light photocatalysis. This work here highlights the importance of microstructure control to the photocatalytic performance and shall shed a light on the design and development of efficient photocatalytic materials/systems.; In this work, we have applied microstructure management and doping techniques to conventional wide band gap semiconductor CaTiO3 with the aim to improve its light absorption and photocatalytic activity. A series of La/Cr co-doping hollow CaTiO3 cubes have been successfully prepared by a template-free hydrothermal method. Their crystal structures, microstructures, optical absorption and photocatalytic hydrogen production have been systematically investigated. Our results suggest that hollow CaTiO3 owns a higher light absorption than solid one and demonstrates a much better photocatalytic activity both under full range (lambda >= 250 nm) and visible light illumination (lambda >= 400 nm). These improvements probably originate from the peculiar hollow microstructures that increase photon-matter interactions and shorten the charge migration pathways. The photocatalytic activity for hydrogen production has been further studied by varying the La/Cr content in CaTiO3. An optimal doping point at 5% La/Cr doping level has been reached for full range illumination with apparent quantum efficiency approaching similar to 2.41%. Nevertheless, the activity under visible light illumination shows a clear dependence on doping level with highest apparent quantum efficiency similar to 0.40% at 20% La/Cr doping level. DFT calculations reveal the critical role of Cr in forming a new spin-polarized valence band inside the original band gap of CaTiO3 therefore is responsible for band gap reduction and visible light photocatalysis. This work here highlights the importance of microstructure control to the photocatalytic performance and shall shed a light on the design and development of efficient photocatalytic materials/systems.
部门归属	[wang, ruinan ; xu, xiaoxiang] tongji univ, shanghai key lab chem assessment & sustainabil, sch chem sci & engn, 1239 siping rd, shanghai 200092, peoples r china ; [ni, shuang] china acad engn phys, laser fus res ctr, sci & technol plasma phys lab, mianyang 621900, peoples r china ; [liu, gang] chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, liaoning, peoples r china
关键词	Visible-light Irradiation H-2 Production In-situ Codoped Srtio3 Evolution Chromium Water Driven Tio2 Nanostructures
学科领域	Chemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
资助者	Young Scientists Fund of the National Natural Science Foundation of China [21401142]; Shanghai Science and Technology Commission [14DZ2261100]; Fundamental Research Funds for the Central Universities
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/79289
专题	中国科学院金属研究所
通讯作者	Xu, XX (reprint author), Tongji Univ, Shanghai Key Lab Chem Assessment & Sustainabil, Sch Chem Sci & Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China.
推荐引用方式 GB/T 7714	Wang, RN,Ni, S,Liu, G,et al. Hollow CaTiO3 cubes modified by La/Cr co-doping for efficient photocatalytic hydrogen production[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2018,225:139-147.
APA	Wang, RN,Ni, S,Liu, G,Xu, XX,&Xu, XX .(2018).Hollow CaTiO3 cubes modified by La/Cr co-doping for efficient photocatalytic hydrogen production.APPLIED CATALYSIS B-ENVIRONMENTAL,225,139-147.
MLA	Wang, RN,et al."Hollow CaTiO3 cubes modified by La/Cr co-doping for efficient photocatalytic hydrogen production".APPLIED CATALYSIS B-ENVIRONMENTAL 225(2018):139-147.