Facile preparation and size-dependent photocatalytic activity of Cu2O nanocrystals modified titania for hydrogen evolution

被引：70

作者：

Li, Likun ^{[1
]}

Xu, Leilei ^{[1
]}

Shi, Weidong ^{[1
]}

Guan, Jianguo ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2013年 / 38卷 / 02期

基金：

中国国家自然科学基金;

关键词：

P25; p-n junction; Cu2O; Quantum confinement effect; H-2; evolution; Photocatalytic activity; NANOTUBE ARRAYS; H-2; EVOLUTION; WATER; TIO2; COMPOSITE; CU2O/TIO2; DEGRADATION; ELECTRODE; DIOXIDE;

D O I：

10.1016/j.ijhydene.2012.10.064

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：

Degussa TiO2 powder (P25) with Cu2O nanocrystals of different sizes deposited on the surface were prepared by a facile ethanol-induced deposition followed with a calcination process at 350 degrees C and characterized by XRD, XPS, HRTEM and UV-Vis diffuse reflectance spectra, respectively. In our protocol, Cu2O nanocrystals is formed by reducing Cu(II) with the ethanol adsorbed on the surface of P25. The absorption edge as well as photocatalytic activity for H-2 evolution are closely related to the size of the Cu2O nanocrystals depending on the Cu content in the as-prepared composites. The 0.9 mol% Cu2O/TiO2 composite with ca. 4 nm Cu2O nanocrystals exhibits the highest photocatalytic H-2 evolution rate of 318 mu mol h(-1) under the illumination of simulant solar light and an apparent quantum efficiency of 28.6% at 365 nm, 397 times higher than that of P25. This enhancement is mainly attributed to the quantum confinement effect of quantum-sized Cu2O nanocrystals (q-Cu2O), which can upgrade the conduction band bottom of q-Cu2O, and thus facilitates the effective separation of photogenerated charge carriers to enhance the photocatalytic activity. The results provided here not only offers a green and simple way for depositing q-Cu2O on the surfaces of P25 to get the photocatalyst with an excellent photocatalytic activity for H-2 evolution, but also sheds a new insight for the fabrication of efficient p-n heterojunctions for the separation of electron-hole pairs by quantum confinement effect. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：816 / 822

页数：7

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