Re-excitation of localized electrons in SnO2 quantum dots for enhanced water photolysis activity

被引：5

作者：

Chen, Xianqun ^{[1
,2
]}

Li, Liping ^{[1
]}

Zhang, Yuelan ^{[1
]}

Xu, Yangsen ^{[1
]}

Li, Guangshe ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Design & Assembly Funct Nanostruct, Fuzhou 350002, Peoples R China

[2] Fujian Normal Univ, Coll Mat Sci & Engn, Fuzhou 350007, Peoples R China

[3] Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China

来源：

RSC ADVANCES | 2016年 / 6卷 / 87期

关键词：

OXYGEN VACANCY; PHOTOCATALYSTS; ZNO;

D O I：

10.1039/c6ra15932j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Trapping and further localization of photo-generated carriers by defects in a photocatalyst are crucial obstacles for enhancing the efficiency of hydrogen generation from water photolysis. In this paper, we reported a re-excitation mechanism of localized electrons assisted by infrared light for improving photocatalytic activity. Increasing hydrogen production is demonstrated when introducing infrared light for SnO2 quantum dots at a grain size smaller than twice its Debye length and supported on g-C3N4. Comparatively, in absence of infrared light, rich oxygen vacancies in these SnO2 quantum dots reduced the photocatalytic activity. The re-excitation of localized electrons would provide a viable approach to utilize electrons more efficiently in the photocatalytic or other catalytic fields.

引用

页码：83848 / 83855

页数：8

共 25 条

[1] Surface reactivity of SnO2 obtained by sol-gel type condensation: Interaction with inert, combustible gases, vapour-phase H2O and air, as revealed by electron paramagnetic resonance spectroscopy [J].