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Extended light absorption and enhanced photoelectrochemical activity of palladium‐decorated hematite nanotubes prepared by photodeposition method
Author(s) -
Momeni Mohamad Mohsen,
Hallaj Akbar,
Ghayeb Yousef,
Bagheri Robabeh,
Song Zhenlun,
Farrokhpour Hossein
Publication year - 2019
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5087
Subject(s) - hematite , chemistry , anodizing , x ray photoelectron spectroscopy , palladium , chemical engineering , scanning electron microscope , substrate (aquarium) , chronoamperometry , absorption edge , visible spectrum , absorption spectroscopy , nanotechnology , materials science , band gap , optics , optoelectronics , mineralogy , catalysis , electrochemistry , cyclic voltammetry , composite material , organic chemistry , oceanography , engineering , aluminium , physics , electrode , geology
Palladium particles were deposited on hematite nanotube surfaces via a facile photodeposition method. Anodization method was then used for direct vertical growth of hematite nanotube arrays (HNTs) on a pretreated iron substrate. Field emission scanning electron microscopy, X‐ray diffraction, diffraction reflection spectroscopy and X‐ray photoelectron spectroscopy analyses were then used to carry out morphological and structural investigations. Compared with the bare HNTs, Pd‐decorated hematite films (Pd/HNTs) exhibit intense visible light absorption and show a red shift of the band edge. Pd/HNTs are more photoelectrochemically active than the non‐decorated films, according to chronoamperometry measurements. Thus, a promising methodology has been developed for the design of a simple and effective photoelectrode for application in photoelectrochemical water splitting systems.