Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
The field of solar fuels has witnessed large number of photoelectrocatalysts, but it remains a challenge to find a material with promising characteristics like optimum band gap (1.6 - 2.0 eV) for visible light absorption, favorable band positions with respect to the redox potentials H2O/H2 and H2O/O2, good aqueous and thermal stability and which is largely abundant and non-toxic.[1] This has led to continuous exploration of materials which has directed research towards mixed metal oxides that possess complementary properties of constituent metal oxides. Among such kinds is Fe2TiO5, with a band gap of around 2.1 eV, favorable band level positions and good stability in a wide pH range. This make it a promising candidate for study into its core and intrinsic properties along with its viability as a photoelectrocatalyst for light driven water splitting.
To fabricate the photocatalyst thin films, Pulsed Laser Deposition (PLD) technique was employed which yield films with lower intrinsic defects, and better crystallinity as compared to usual solution based methods like solvothermal synthesis. [2] Here, we report on Fe2TiO5 compact films fabricated through this technique and characterized under solar simulated light to access their photoelectrochemical performance. Films were deposited on Fluorine doped Tin Oxide (FTO) substrates, using stoichiometric Fe2TiO5 target, at room temperature under varying O2 partial pressure in PLD chamber. Structural, optical and morphological characterizations showed the pure phase films with a nanoporous network of particles of size around 20 nm. It demonstrated significant photoactivity, photovoltage and fascinating electrochemical and mechanical stability. These insights would be discussed in-detail to highlight the development of this material and its long-term feasibility as a photoelectrocatalyst for light driven water splitting.
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