Rapid sun-light driven photocatalytic functions of 3D rGO/ZnO/Ag heterostructures via improved charge transfer kinetics

被引：37

作者：

Banumathi, S. ^{[1
]}

Uma, J. ^{[1
]}

Ravi, A. ^{[2
]}

Balraj, B. ^{[3
]}

Siva, C. ^{[4
]}

Ilanchezhiyan, P. ^{[5
,6
]}

Kumar, G. Mohan ^{[5
,6
]}

机构：

[1] M Kumarasamy Coll Engn, Dept Elect & Elect Engn, Karur 639113, India

[2] Anna Univ, Univ Coll Engn, Dept Phys, Kancheepuram 631552, India

[3] K Ramakrishnan Coll Technol, Dept Elect & Elect Engn, Tiruchirappalli 621112, India

[4] SRM Inst Sci & Technol, Dept Phys & Nanotechnol, Kattankulathur 603203, India

[5] Dongguk Univ, Quantum Funct Semicond Res Ctr QSRC, Seoul 04623, South Korea

[6] Dongguk Univ, Nanoinformat Technol Acad NITA, Seoul 04623, South Korea

来源：

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2021年 / 10卷 / 10期

基金：

新加坡国家研究基金会;

关键词：

Graphene; Heterostructures; Photocatalysis; Sunlight; ZnO;

D O I：

10.1016/j.jmrt.2020.12.062

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Enhancing photon absorption across visible region could be of great significance in visualizing rapid photocatalytic reactions. In this regard, we report on a novel three-dimensional (3D) rGO/ZnO/Ag heterostructure processed via solvothermal and photoreduction techniques. The structural studies revealed the formation of a complete rGO/ZnO/Ag heterostructure. The microscopic images revealed ZnO on rGO specimens and Ag on both ZnO and rGO surface. Enhanced visible region photon absorption and lowering in band gap values was realized in rGO/ZnO/Ag specimens over rGO/ZnO. The photocatalytic performance evaluated through dye degradation reactions under sunlight illumination indicated 3D heterostructure to exhibit rapid and enhanced photocatalytic activity. A schematic mechanism was established to illustrate the enhanced charge transfer kinetics involved in the reactions. Additionally, studies on increased photocatalytic reaction rate for addition of H2O2 and role of reaction temperature was also made. The obtained heterostructure also demonstrated 99% efficiency towards recycled photocatalytic reactions. (C) 2020 The Author(s). Published by Elsevier B.V.

引用

页码：1301 / 1309

页数：9

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