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Photoelectrochemical water splitting at nanostructured ZnFe2O4 electrodes

Paper ID Volume ID Publish Year Pages File Format Full-Text
26829 43981 2010 7 PDF Available
Title
Photoelectrochemical water splitting at nanostructured ZnFe2O4 electrodes
Abstract

Semiconducting nanocrystalline ZnFe2O4 thin films were deposited by aerosol-assisted chemical vapour deposition (AACVD) for photoelectrochemical (PEC) water splitting. The effect of deposition parameters such as solvent type, temperature and deposition time on PEC properties has been investigated. The SEM analysis illustrated that the morphology of the films changes significantly with the change of solvent. The films deposited from ethanolic precursor solution have a morphology consisting of interconnected cactus-like ZnFe2O4 structure growing vertically from the FTO substrate. The current–voltage characterization proved that the nanocrystalline ZnFe2O4 electrodes exhibit n-type semiconducting behaviour and the photocurrent was found strongly dependent on the deposition solvent, deposition temperature and deposition time. The maximum photocurrent density of 350 μA/cm2 at 0.23 V vs. Ag/AgCl/3 M KCl (∼1.23 V vs. RHE) was obtained for the ZnFe2O4 electrode synthesized using the optimum deposition temperature of 450 °C, the deposition time of 35 min, and 0.1 M solution of (1) in ethanol. The electrode gave an incident photon to electron conversion efficiency of 13.5% at an applied potential of 0.23 V vs. Ag/AgCl/3 M KCl at 350 nm. The donor density of the ZnFe2O4 was 3.24 × 1024 m−3 and the flatband potential is approximately −0.17 V, which remarkably agrees with the photocurrent onset potential of −0.18 V vs. Ag/AgCl/3 M KCl.

Keywords
ZnFe2O4; Ferrite; Nanostructure; Photoelectrochemical; Water splitting; AACVD
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Photoelectrochemical water splitting at nanostructured ZnFe2O4 electrodes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 216, Issues 2–3, 15 December 2010, Pages 119–125
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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