Influence of growth time on photoelectrical characteristics and photocatalytic hydrogen production of decorated Fe2O3 on TiO2 nanorod in photoelectrochemical cell

• Published in: Applied surface science Vol. 510; p. 145482
• Main Authors: Bashiri, Robabeh, Samsudin, Mohamad Fakhrul Ridhwan, Mohamed, Norani Muti, Suhaimi, Nur Amirah, Ling, Liew Yi, Sufian, Suriati, Kait, Chong Fai
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.04.2020
• Subjects: Fe2O3; Heterostructure; Hydrogen; Photoelectrochemical cell; TiO2 nanorod; Heterostructure; Photoelectrochemical cell; TiO2 nanorod; Hydrogen; Fe2O3
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2020.145482

[Display omitted] •Vertically aligned rutile TiO2@Fe2O3 Nanorods were synthesized by hydrothermal method.•The charge carrier behaviour and morphology are highly affected by growth time.•The highest photoconversion efficiency was obtained by the photoanode with growth time of 24 h. We developed decorated Fe2O3 on the surface of one dimensional (1D) TiO2 nanorods (NRs) as a photocatalyst in a photoelectrochemical hydrogen production system using the two-step hydrothermal technique. The photocatalytic hydrogen production over the designed 1D TiO2@Fe2O3 NRs was optimized by varying the hydrothermal duration. Several characterization techniques were applied to study the physicochemical and photoelectrochemical properties of the prepared photocatalysts. It was observed that the adhesiveness and electrical connection of the TiO2@Fe2O3 and FTO substrate, crystal growth, and photoelectrochemical behavior strongly depend on the hydrothermal duration time. The photoanode with a growth time of 24 h produced the maximum amount of hydrogen (640 µmol cm−2) under visible light with external potential from dye-sensitized solar cells in 1 M KOH and 5 vol% glycerol solution in the photoelectrochemical cell. The EIS data showed that this photocatalyst had the lowest charge transfer resistance of 167.84 Ω and the longest electron lifetime of 347.97 ms. Also, its Mott-Schottky data revealed a more negative flat bad potential of −1.1 V with profound ability of proton (H+) reduction to H2 and high donor density of 3.55 × 1021 cm−3, which resulted in much more photocurrent density and photoconversion efficiency at the electrode/electrolyte interface compared to others.