Kalanur, Shankara Sharanappa Hwang, Yun Jeong Chae, Sang Youn Joo, Oh Shim 2024-01-20T13:00:51Z 2024-01-20T13:00:51Z 2021-09-01 2013-03 2050-7488 https://pubs.kist.re.kr/handle/201004/128314 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. English ROYAL SOC CHEMISTRY TUNGSTEN TRIOXIDE FILMS NANOWIRE ARRAYS SOFT CHEMISTRY SOLAR-ENERGY TIO2 ELECTRODES MORPHOLOGY EFFICIENCY STABILITY TITANIUM Facile growth of aligned WO3 nanorods on FTO substrate for enhanced photoanodic water oxidation activity Article 10.1039/c3ta01175e 1 JOURNAL OF MATERIALS CHEMISTRY A, v.1, no.10, pp.3479 - 3488 JOURNAL OF MATERIALS CHEMISTRY A 1 10 3479 3488 scie scopus 000314784000036 2-s2.0-84876561082 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article TUNGSTEN TRIOXIDE FILMS NANOWIRE ARRAYS SOFT CHEMISTRY SOLAR-ENERGY TIO2 ELECTRODES MORPHOLOGY EFFICIENCY STABILITY TITANIUM