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Efficient photocatalytic oxygen production over Ca-modified LaTiO2N
Wu, Fangfang; Liu, Gang; Xu, Xiaoxiang; Xu, XX (reprint author), Tongji Univ, Sch Chem Sci & Engn, Shanghai Key Lab Chem Assessment & Sustainabil, 1239 Siping Rd, Shanghai 200092, Peoples R China.
2017-02-01
Source PublicationJOURNAL OF CATALYSIS
ISSN0021-9517
Volume346Pages:10-20
AbstractLaTiO2N has been considered a promising candidate for efficient photocatalytic water splitting. However, its photocatalytic activity is often hampered by the presence of structural defects and poor charge mobility. In this work, we introduced Ca into the crystal structure of LaTiO2N via a simple co-precipitation method and investigated the photocatalytic and photoelectrochemical properties for the full range solid solution La1-xCaxTiO2+yN1-y (0 <= x, y <= 1). Our results show that incorporating Ca into LaTiO2N induces a strong structural shrinkage as well as a space group change from I mma to P nma around a middle doping point (x = 0.5). The presence of Ca effectively boosts the photocatalytic oxygen production and aids photocurrent extraction for LaTiO2N. The best photocatalytic activity was achieved for sample La0.3Ca0.7TiO2.7N0.3 with oxygen production rate similar to 66.96 mu mol/h under visible light illumination (lambda >= 420 nm), corresponding to apparent quantum efficiency similar to 3.13%. XPS analysis revealed a substantial reduction in surface Ti3+ species and a removal of A-site cation segregation for samples containing Ca. Further photoelectrochemical analysis highlights the critical role of Ca in enhancing the charge mobility of LaTiO2N. The better photocatalytic performance of Ca-modified LaTiO2N can be understood as a result of defect removal, high charge mobility, and improved surface charge migration pathways that considerably prolong the lifetimes of photogenerated charges. (C) 2016 Elsevier Inc. All rights reserved.; LaTiO2N has been considered a promising candidate for efficient photocatalytic water splitting. However, its photocatalytic activity is often hampered by the presence of structural defects and poor charge mobility. In this work, we introduced Ca into the crystal structure of LaTiO2N via a simple co-precipitation method and investigated the photocatalytic and photoelectrochemical properties for the full range solid solution La1-xCaxTiO2+yN1-y (0 <= x, y <= 1). Our results show that incorporating Ca into LaTiO2N induces a strong structural shrinkage as well as a space group change from I mma to P nma around a middle doping point (x = 0.5). The presence of Ca effectively boosts the photocatalytic oxygen production and aids photocurrent extraction for LaTiO2N. The best photocatalytic activity was achieved for sample La0.3Ca0.7TiO2.7N0.3 with oxygen production rate similar to 66.96 mu mol/h under visible light illumination (lambda >= 420 nm), corresponding to apparent quantum efficiency similar to 3.13%. XPS analysis revealed a substantial reduction in surface Ti3+ species and a removal of A-site cation segregation for samples containing Ca. Further photoelectrochemical analysis highlights the critical role of Ca in enhancing the charge mobility of LaTiO2N. The better photocatalytic performance of Ca-modified LaTiO2N can be understood as a result of defect removal, high charge mobility, and improved surface charge migration pathways that considerably prolong the lifetimes of photogenerated charges. (C) 2016 Elsevier Inc. All rights reserved.
description.department[wu, fangfang ; xu, xiaoxiang] tongji univ, sch chem sci & engn, shanghai key lab chem assessment & sustainabil, 1239 siping rd, shanghai 200092, peoples r china ; [liu, gang] chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china
KeywordPhotocatalyst Water Splitting Latio2n Oxygen Production
Subject AreaChemistry, Physical ; Engineering, Chemical
Funding OrganizationYoung Scientists Fund of the National Natural Science Foundation of China [21401142]; Recruitment Program of Global Youth Experts (1000 plan); Shanghai Science and Technology Commission [14DZ2261100]; Fundamental Research Funds for the Central Universities
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78307
Collection中国科学院金属研究所
Corresponding AuthorXu, XX (reprint author), Tongji Univ, Sch Chem Sci & Engn, Shanghai Key Lab Chem Assessment & Sustainabil, 1239 Siping Rd, Shanghai 200092, Peoples R China.
Recommended Citation
GB/T 7714
Wu, Fangfang,Liu, Gang,Xu, Xiaoxiang,et al. Efficient photocatalytic oxygen production over Ca-modified LaTiO2N[J]. JOURNAL OF CATALYSIS,2017,346:10-20.
APA Wu, Fangfang,Liu, Gang,Xu, Xiaoxiang,&Xu, XX .(2017).Efficient photocatalytic oxygen production over Ca-modified LaTiO2N.JOURNAL OF CATALYSIS,346,10-20.
MLA Wu, Fangfang,et al."Efficient photocatalytic oxygen production over Ca-modified LaTiO2N".JOURNAL OF CATALYSIS 346(2017):10-20.
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