Molten-salt defect engineering of TiO2(B) nanobelts for enhanced photocatalytic hydrogen evolution

Defect engineering has been proved to be an effective strategy to adjust the electronic structures and photocatalytic activities of semiconductor oxides. However, due to lack of convenient approach to construct defect, the effect of oxygen vacancy defect on photocatalytic hydrogen evolution has alwa...

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Autores principales:	Daijun Xie, Yingjie Wang, Han Yu, Xinran Yang, Shining Geng, Xiangfu Meng
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Molten-salt TiO2(B) nanobelts Defect engineering Surface oxygen vacancy Hydrogen evolution Physical and theoretical chemistry QD450-801 Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/8ac3b6d6f4304e0d8355d72389116599
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spelling	oai:doaj.org-article:8ac3b6d6f4304e0d8355d723891165992021-11-12T04:49:10ZMolten-salt defect engineering of TiO2(B) nanobelts for enhanced photocatalytic hydrogen evolution2666-934X10.1016/j.jciso.2021.100031https://doaj.org/article/8ac3b6d6f4304e0d8355d723891165992021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666934X21000301https://doaj.org/toc/2666-934XDefect engineering has been proved to be an effective strategy to adjust the electronic structures and photocatalytic activities of semiconductor oxides. However, due to lack of convenient approach to construct defect, the effect of oxygen vacancy defect on photocatalytic hydrogen evolution has always been controversial. Herein, we proposed a facile molten-salt defect engineering (MSDE) strategy to introduce oxygen vacancies (Vos) defects in TiO2(B) nanobelt (TNB). By tuning the addition amount of NaBH4 during molten-salt calcination process, the concentration of surface oxygen vacancies can be effectively adjusted. As a result, the appropriate oxygen vacancies on TNB not only suppressed the recombination of photogenerated electrons and holes, but also raised the conduction band position of TNB, thereby increasing the reduction potential of photogenerated electrons. The as-prepared photocatalyst TNB-NaBH4-2 with optimal Vos concentration exhibited highly efficient photocatalytic hydrogen evolution performance at a rate of 3.2 mmol g−1h−1 under simulate solar light, nearly 1.85 times than that of pristine TNB. This work proposes a simple method for constructing moderate oxygen vacancies on metal oxides for enhancing photocatalytic hydrogen evolution.Daijun XieYingjie WangHan YuXinran YangShining GengXiangfu MengElsevierarticleMolten-saltTiO2(B) nanobeltsDefect engineeringSurface oxygen vacancyHydrogen evolutionPhysical and theoretical chemistryQD450-801Chemical technologyTP1-1185ENJCIS Open, Vol 4, Iss , Pp 100031- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Molten-salt TiO2(B) nanobelts Defect engineering Surface oxygen vacancy Hydrogen evolution Physical and theoretical chemistry QD450-801 Chemical technology TP1-1185
spellingShingle	Molten-salt TiO2(B) nanobelts Defect engineering Surface oxygen vacancy Hydrogen evolution Physical and theoretical chemistry QD450-801 Chemical technology TP1-1185 Daijun Xie Yingjie Wang Han Yu Xinran Yang Shining Geng Xiangfu Meng Molten-salt defect engineering of TiO2(B) nanobelts for enhanced photocatalytic hydrogen evolution
description	Defect engineering has been proved to be an effective strategy to adjust the electronic structures and photocatalytic activities of semiconductor oxides. However, due to lack of convenient approach to construct defect, the effect of oxygen vacancy defect on photocatalytic hydrogen evolution has always been controversial. Herein, we proposed a facile molten-salt defect engineering (MSDE) strategy to introduce oxygen vacancies (Vos) defects in TiO2(B) nanobelt (TNB). By tuning the addition amount of NaBH4 during molten-salt calcination process, the concentration of surface oxygen vacancies can be effectively adjusted. As a result, the appropriate oxygen vacancies on TNB not only suppressed the recombination of photogenerated electrons and holes, but also raised the conduction band position of TNB, thereby increasing the reduction potential of photogenerated electrons. The as-prepared photocatalyst TNB-NaBH4-2 with optimal Vos concentration exhibited highly efficient photocatalytic hydrogen evolution performance at a rate of 3.2 mmol g−1h−1 under simulate solar light, nearly 1.85 times than that of pristine TNB. This work proposes a simple method for constructing moderate oxygen vacancies on metal oxides for enhancing photocatalytic hydrogen evolution.
format	article
author	Daijun Xie Yingjie Wang Han Yu Xinran Yang Shining Geng Xiangfu Meng
author_facet	Daijun Xie Yingjie Wang Han Yu Xinran Yang Shining Geng Xiangfu Meng
author_sort	Daijun Xie
title	Molten-salt defect engineering of TiO2(B) nanobelts for enhanced photocatalytic hydrogen evolution
title_short	Molten-salt defect engineering of TiO2(B) nanobelts for enhanced photocatalytic hydrogen evolution
title_full	Molten-salt defect engineering of TiO2(B) nanobelts for enhanced photocatalytic hydrogen evolution
title_fullStr	Molten-salt defect engineering of TiO2(B) nanobelts for enhanced photocatalytic hydrogen evolution
title_full_unstemmed	Molten-salt defect engineering of TiO2(B) nanobelts for enhanced photocatalytic hydrogen evolution
title_sort	molten-salt defect engineering of tio2(b) nanobelts for enhanced photocatalytic hydrogen evolution
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/8ac3b6d6f4304e0d8355d72389116599
work_keys_str_mv	AT daijunxie moltensaltdefectengineeringoftio2bnanobeltsforenhancedphotocatalytichydrogenevolution AT yingjiewang moltensaltdefectengineeringoftio2bnanobeltsforenhancedphotocatalytichydrogenevolution AT hanyu moltensaltdefectengineeringoftio2bnanobeltsforenhancedphotocatalytichydrogenevolution AT xinranyang moltensaltdefectengineeringoftio2bnanobeltsforenhancedphotocatalytichydrogenevolution AT shininggeng moltensaltdefectengineeringoftio2bnanobeltsforenhancedphotocatalytichydrogenevolution AT xiangfumeng moltensaltdefectengineeringoftio2bnanobeltsforenhancedphotocatalytichydrogenevolution
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Molten-salt defect engineering of TiO2(B) nanobelts for enhanced photocatalytic hydrogen evolution

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