ZnO nano-tetrapod photoanodes for enhanced solar-driven water splitting

被引：38
作者：
Hassan, N. K. [2 ]
Hashim, M. R. [2 ]
Allam, Nageh K. [1 ]
机构：
[1] Amer Univ Cairo, Sch Sci & Engn, Dept Phys, EML, New Cairo 11835, Egypt
[2] Univ Sains Malaysia, Sch Phys, George Town 11800, Malaysia
来源：
CHEMICAL PHYSICS LETTERS | 2012年 / 549卷
关键词：
ZINC-OXIDE; OPTICAL-PROPERTIES; PHOTOLUMINESCENCE; NANOSTRUCTURES; GROWTH; ARRAYS; PHOTORESPONSE; LAYER;
D O I：
10.1016/j.cplett.2012.08.038
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：
ZnO nanotetrapod (ZnO-TP) photoanodes have been fabricated by a simple thermal evaporation method followed by characterization of their morphological, structural, optical and photoelectrochemical properties. The reaction time was found to be a critical factor in the synthesis of well-defined tetrapod nanostructures. The crystallinity of the grown tetrapods was investigated using X-ray diffraction as well as Raman spectroscopy. The photoluminescence (PL) spectra of the fabricated ZnO nanostructures showed two peaks; a near-band-edge (NBE) emission in the UV region and a broad deep-level emission (DLE) in the green emission region. Used as photoanodes to photoelectrochemically split water, the 90 min-treated ZnO-TP electrodes showed a photocurrent density of 0.4 mA/cm(2) under AM 1.5G illumination (100 mW/cm(2), 0.5 M Na2SO4), a significantly greater photocurrent than the bulk ZnO counterpart electrodes. The transient photocurrent measurements revealed exceptional stability of the as-fabricated ZnO-TPs. (c) 2012 Elsevier B.V. All rights reserved.
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收藏
页码：62 / 66
页数：5
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