Facile growth of aligned WO3 nanorods on FTO substrate for enhanced photoanodic water oxidation activity

被引:301
作者
Kalanur, Shankara Sharanappa [1 ]
Hwang, Yun Jeong [1 ]
Chae, Sang Youn [1 ]
Joo, Oh Shim [1 ]
机构
[1] Korea Inst Sci & Technol, Clean Energy Res Ctr, Seoul 130650, South Korea
关键词
TUNGSTEN TRIOXIDE FILMS; NANOWIRE ARRAYS; SOFT CHEMISTRY; SOLAR-ENERGY; TIO2; ELECTRODES; MORPHOLOGY; EFFICIENCY; STABILITY; TITANIUM;
D O I
10.1039/c3ta01175e
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
We demonstrate a facile hydrothermal method to grow oriented WO3 nanorods on a transparent conductive substrate without the assistance of any seed layer or structure directing agent for photocatalytic applications. The effects of hydrothermal growth conditions such as reaction time, precursor solution, and post annealing temperature on the crystalline phase and morphology of the WO3 on the FTO substrate are discussed. XRD studies reveal that the as-prepared orthorhombic WO3 center dot 0.33H(2)O nanorods are transformed to the hexagonal phase by post annealing at 400 degrees C. Moreover, post annealing above 500 degrees C converts them to monoclinic WO3 nanorods on the FTO substrate, which is the photoactive crystal phase of WO3 for water oxidation. The synthesized WO3 nanorods were revealed to have a single crystalline structure by HRTEM analysis. The photoelectrochemical water splitting properties of the annealed WO3 nanorod arrays were investigated in 0.5 M Na2SO4 under AM 1.5G illumination. The optimized WO3 nanorod arrays exhibit a photocurrent of 2.26 mA cm(-2) at 1.23 V (versus RHE), and an incident photon-to-current conversion efficiency (IPCE) of as high as 35% at 400 nm for the photoelectrochemical oxidation of water. This simple hydrothermal method can allow the use of WO3 for photoanodic applications with high efficiency.
引用
收藏
页码:3479 / 3488
页数:10
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