Preparation and Characterization of Pt/TiO2 Nanotube Arrays (TNAs) cathode using Photoreduction Method for Hydrogen evolutionust Try to Submit This Sample Abstract Sherly Kasuma Warda Ningsih1,2, Rahmat Wibowo1, Jarnuzi Gunlazuardi1*
1 Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, 16424, Indonesia
2Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Kampus Air Tawar, Padang 25132, Indonesia
Abstract
TiO2 nanotube arrays were fabricated using two step anodization method. TNAs have been modified by photoreduction technique with Pt as the cathode in the photoelectrocatalytic zone for reduction reaction of H+ to produce hydrogen. TNAs with Pt was modified using hexachloroplatinic acid (H2PtCl6) as the precursor by immersion of this solution on the TNA substrate. Pt/TNAs were characterized using SEM-EDX, XRD, UV-Vis DRS, Raman Spectroscopy, Photoluminescence (PL), and photoelectrochemical analysis. The results show that the morphology of TNAs in the tube forms 2.1 -m in height, and Pt nanoparticles are formed on the mouth wall of the tube with a size of around 10 nm. EDX analysis was carried out to determine the composition of Pt/TNAs is around 0.15%, Ti 37.09%, and O 62.76%, indicating that Pt has been decorated on the TNAs photoanode. The band gap value of Pt/TNAs is around 2.82 eV. The diffractogram shows three groups of diffraction peaks, indicating the presence of anatase TiO2, Ti as a substrate, and Pt, which has been modified in the TNAs. The Raman peaks of TNAs are confirmed to appear at Raman shifts of 144.75, 196.51, 395.94- 517.14, and 638.85 cm-1, indicating the active Raman phonon modes Eg(1), Eg(2), B1g(1), A1g(1)+ B1g(2) and Eg(3), respectively. PEC cathodes for hydrogen production using Pt-decorated TNAs have been successfully prepared using photoreduction.
