Facile growth of aligned WO3 nanorods on FTO substrate for enhanced photoanodic water oxidation activity
- Facile growth of aligned WO3 nanorods on FTO substrate for enhanced photoanodic water oxidation activity
- Shankara S.Kalanur; 황윤정; 채상윤; 주오심
- Issue Date
- Journal of materials chemistry. A, Materials for energy and sustainability
- VOL 1, NO 10, 3479-3488
- 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$0.33H2O nanorods are transformed to the hexagonal phase by post annealing at 400 ℃.
Moreover, post annealing above 500 ℃ 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.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.