Type

Journal Article

Authors

Igor Shvets
Brian Walls
Aitkazy Kaisha
Robert O'Connor
Feljin Jose
Ainur Zhussupbekova
Pranab Biswas
Ardak Ainabayev

Subjects

Engineering

Topics
nanoscience materials visual impairment nanostructures solar water splitting titanium ti doped hematite green fuels nanotechnology energy needs renewable fuels photoelectrochemical water splitting health hydrogen semiconductor devices and materials fabrication

Tuning of oxygen vacancy-induced electrical conductivity in Ti-doped hematite films and its impact on photoelectrochemical water splitting (2020)

Abstract Titanium (Ti)-doped hematite (α-Fe2O3) films were grown in oxygen-depleted condition by using the spray pyrolysis technique. The impact of post-deposition annealing in oxygen-rich condition on both the conductivity and water splitting efficiency was investigated. The X-ray diffraction pattern revealed that the films are of rhombohedral α-Fe2O3 structure and dominantly directed along (012). The as-grown films were found to be highly conductive with electrons as the majority charge carriers (n-type), a carrier concentration of 1.09×1020 cm−3, and a resistivity of 5.9×10−2 Ω-cm. The conductivity of the films were reduced upon post-deposition annealing. The origin of the conductivity was attributed firstly to Ti4+ substituting Fe3+ and secondly to the ionized oxygen vacancies (VO) in the crystal lattice of hematite. Upon annealing the samples in oxygen-rich condition, VO slowly depleted and the conductivity reduced. The photocurrent of the as-grown samples was found to be 3.4 mA/cm−2 at 1.23 V vs. RHE. The solar-to-hydrogen efficiency for the as-grown sample was calculated to be 4.18% at 1.23 V vs. RHE. The photocurrents were found to be significantly stable in aqueous environment. A linear relationship between conductivity and water-splitting efficiency was established.
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Full list of authors on original publication

Igor Shvets, Brian Walls, Aitkazy Kaisha, Robert O'Connor, Feljin Jose, Ainur Zhussupbekova, Pranab Biswas, Ardak Ainabayev

Experts in our system

1
Igor Shvets
Trinity College Dublin
Total Publications: 202
 
2
Brian Walls
Trinity College Dublin
Total Publications: 9
 
3
Aitkazy Kaisha
Trinity College Dublin
Total Publications: 3
 
4
Robert O'Connor
Dublin City University
Total Publications: 74
 
5
Ardak Ainabayev
Trinity College Dublin
Total Publications: 3