Publication date: 15th December 2014
Zinc ferrite (ZnxFe2-xO4) thin films were deposited using electrochemical deposition in the presence of coumarin 343 (C343) for photoelectrochemical oxidation of water. The influence of deposition time, potential and concentration of the C343 on the photoresponse of the electrode was investigated. The morphology of the films changes significantly with the addition of Coumarin 343 as evidenced by SEM analysis. Structural information is obtained from XRD measurements and the optical band is estimated from diffuse reflectance measurements. The current–voltage curves show that the ZnFe2O4 electrodes exhibit n-type semiconducting behavior and the photocurrent was strongly dependent on the deposition parameters i.e concentration of template, deposition time and potential. The initial results show a photocurrent density of 120-130 µA/cm2 at 0.23 V vs. Ag/AgCl/sat. KCl (~1.23 V vs. RHE) for the ZnFe2O4 electrode electrodeposited from a solution containing 100 µM C343 and thermally treated at 600 oC. The recorded photocurrent density is 3-4 times higher than electrodes prepared under similar conditions without C343. Further improvements are expected by fine tuning of the deposition parameters.
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