Carbon quantum dots/TiO2 composites for efficient photocatalytic hydrogen evolution

被引：650

作者：

Yu, Huijun ^{[1
,2
]}

Zhao, Yufei ^{[1
]}

Zhou, Chao ^{[1
]}

Shang, Lu ^{[1
]}

Peng, Yong ^{[1
,2
]}

Cao, Yinhu ^{[1
]}

Wu, Li-Zhu ^{[1
]}

Tung, Chen-Ho ^{[1
]}

Zhang, Tierui ^{[1
]}

机构：

[1] Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Photochem Convers & Optoelect Mat, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 10049, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2014年 / 2卷 / 10期

基金：

中国国家自然科学基金; 北京市自然科学基金;

关键词：

VISIBLE-LIGHT; ANATASE TIO2; HIGHLY EFFICIENT; GRAPHENE; DOTS; DEGRADATION; HETEROSTRUCTURES; PHOTOREDUCTION; PHOTOACTIVITY; NANOTUBES;

D O I：

10.1039/c3ta14108j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Carbon quantum dots modified P25 TiO2 composites (CQDs/P25) with a "dyade"-like structure were prepared via a facile one-step hydrothermal reaction. CQDs/P25 exhibited improved photocatalytic H-2 evolution under UV-Vis and visible light (lambda > 450 nm) irradiation without loading any noble metal cocatalyst, compared to pure P25. A possible mechanism of the photocatalytic H-2 production activity over CQDs/P25 was proposed based on detailed measurements of the transient photocurrent response, surface photovoltage and hydroxyl radicals. CQDs play dual roles on the improved photocatalytic activity of CQDs/P25. Under UV-Vis light irradiation CQDs act as an electron reservoir to improve the efficient separation of the photoinduced electron-hole pairs of P25. However, under visible light irradiation CQDs act as a photosensitizer to sensitize P25 into a visible light response "dyade" structure for H-2 evolution.

引用

页码：3344 / 3351

页数：8

共 50 条

[1] Visible-light photocatalysis in nitrogen-doped titanium oxides [J].