Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
One of the largest bottlenecks within the field of solar fuels remains the development of stable and high-performing photoanode materials. One of the most promising materials to arise out of these particular visible spectrum solar fuel material investigations have been oxynitrides – so-called due to the substitution of oxygen with nitrogen in what would otherwise be a metal oxide.
Unfortunately, despite the introduction of this high-performance oxynitride photoanode to the literature community, the material itself has been plagued with stability issues and a wide reported range of photocurrent densities. Very limited studies attempt to address possible physicochemical reasons behind this instability and the large variance in material performance
In our investigation, we study the stabilized photoelectrochemical performance of several model Lanthanum Titanium Oxynitride (LTON) polycrystalline and epitaxial thin films. We reveal divergent behaviours in photo charge extraction even among thin film samples of comparable stoichiometry. Further photoelectrochemical characterization of cocatalyst deposited oriented LTON reveal a continued dependency on the underlying supporting structure. Ultimately, the different behaviours of interface and crystallographic structures provide us with extra dimensions by which we can tune the underlying photoelectrochemical properties desirable for our application.
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