Construction of heterojuncted photocatalyst with TiO2 quantum dots and graphene oxide nanosheets for highly efficient photocatalysis

被引：17

作者：

Wang, Guojing ^{[1
]}

Wang, Fengqi ^{[1
]}

Liu, Shuo ^{[1
]}

Li, Mingyang ^{[2
,6
]}

Xie, Mingzheng ^{[3
]}

Yang, Zhilong ^{[3
]}

Xiang, Yunjie ^{[4
]}

Lv, Shasha ^{[5
]}

Han, Weihua ^{[1
]}

机构：

[1] Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Peoples R China

[2] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China

[3] Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China

[4] Southwest Univ, Sch Mat & Energy, Chongqing 404100, Peoples R China

[5] Beijing Normal Univ, Coll Nucl Sci & Technol, Key Lab Beam Technol & Mat Modificat, Minist Educ, Beijing 100875, Peoples R China

[6] China North Nucl Fuel Co Ltd, Baotou 014035, Peoples R China

来源：

SCRIPTA MATERIALIA | 2021年 / 199卷

基金：

中国国家自然科学基金;

关键词：

Catalysis; Quantum dots; Graphene oxide; Heterojunctions; COMPOSITES; MECHANISM; TITANIA; PERFORMANCE; FABRICATION; WATER;

D O I：

10.1016/j.scriptamat.2021.113862

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

To overcome the recombination issue of photocarriers, TiO2 quantum dots (QDs, nanoparticles in a few nanometers) were used to form heterojunctions with graphene oxide nanosheets. This combination has significantly enhanced the photocatalytic activity by providing more active reaction sites at the nanoscale surface and suppressing photocarrier recombination through fast separating the photocarriers by the internal electric field in the TO2/graphene oxide heterojunctions. The enhancement in photocatalytic activity has been evidenced by the improved hydrogen generation rate in photoelectrochemical water splitting, which is about 30% higher than that of bare TiO2 QDs in the same situation. Moreover, the TiO2/graphene oxide composite exhibits a lower flat band potential, which means a higher reducing potential of photo excited electrons. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：5

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