Nanostructured α-Fe2O3 thin film electrodes were deposited by aerosol-assisted chemical vapour deposition (AACVD) for photoelectrochemical (PEC) water splitting on conducting glass substrates using 0.1 M methanolic solution of Fe(acac)3. The XRD analysis confirmed that the films are highly crystalline α-Fe2O3 and free from other iron oxide phases. The highly reproducible electrodes have an optical bandgap of ∼2.15 eV and exhibit anodic photocurrent.
The current–voltage characterization of the electrodes reveals that the photocurrent density strongly depended on the film morphology and deposition temperature. Scanning electron microscopy (SEM) analysis showed a change in the surface morphology with the change in deposition temperature. The films deposited at 450 °C have nanoporous structures which provide a maximum electrode/electrolyte interface.
The maximum photocurrent density of 455 µA/cm2 was achieved at 0.25 V vs. Ag/AgCl/3M KCl (∼1.23 V vs. RHE) and the incident photon to electron conversion efficiency (IPCE) was 23.6% at 350 nm for the electrode deposited at 450 °C.
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Tahir, A.A., Mat‐Teridi, M.A. and Wijayantha, K.G., 2014. Photoelectrochemical properties of texture‐controlled nanostructured α‐Fe2O3 thin films prepared by AACVD. physica status solidi (RRL)-Rapid Research Letters, 8(12), pp.976-981.
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Categories: Material & Chemical