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 H+/H2 and H2O/O2, good aqueous and thermal stability consisting of elements, which are 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, Fe2TiO5 with a band gap of around 2.1 eV and favorable band level positions, has good stability in a wide pH range. This makes 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 explore the materials’ suitability as a photocatalyst, it is imperative to understand both intrinsic and photoelectrochemical properties they exhibit. For the former case, we deposited Fe2TiO5 compact films on Fluorine doped Tin Oxide (FTO) substrates through Pulsed Laser Deposition (PLD), which is expected to yield lower defects as compared to usual synthesis methods. To further our efforts in accessing the photoelectrochemical performance, nanoporous Fe2TiO5 films were deposited on FTO through earlier reported solvothermal route to develop films with high porosity to allow better hole migration into the electrolyte.[2] Detailed characterizations were done for samples fabricated through different methods. Both kind of films demonstrated significant photoactivity, photovoltage and fascinating electrochemical and mechanical stability under high pH range. Since the films deposited were different in their structural, optical and electronic behavior, it is interesting to study their varied aspects. These insights would be discussed in this report to highlight the development of this material and its long-term feasibility as a photoelectrocatalyst for light driven water splitting.
REFERENCES
[1] Bassi, P. S.; Gurudayal; Wong, L. H.; Barber, J., Iron based photoanodes for solar fuel production. Phys Chem Chem Phys 2014,16(24), 11834-11842.
[2] Bassi, P. S.; Chiam, S. Y.; Gurudayal; Barber, J.; Wong, L. H., Hydrothermal Grown Nanoporous Iron Based Titanate, Fe2TiO5 for Light Driven Water Splitting. ACS Applied Materials & Interfaces 2014,6(24), 22490-22495.
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