In Situ X-ray Absorption Spectroscopy Study of the Deactivation Mechanism of a Ni-SrTiO₃ Photocatalyst Slurry Active in Water Splitting.

ABSTRACT: We used in situ X-ray absorption spectroscopy (XAS) to investigate the composition-performance correlation of Ni-SrTiO₃ photocatalysts active for water splitting. After preparation and exposure to ambient conditions, the Ni particles on SrTiO₃ consist of Ni(0) and Ni(II) phases, with a 4:1 at % ratio, in a metal/oxide core/shell configuration, as confirmed by XPS and TEM-EDX. In situ XAS experiments using an aqueous slurry of the Ni-SrTiO₃ photocatalyst and simultaneous continuous exposure to 365 nm light with a power density of 100 mW cm^-2 and the X-rays do not reveal significant changes in oxidation state of the Ni particles. Contrarily, when the X-rays are discontinuously applied, UV excitation leads to oxidation of a significant fraction of N

SUBMITTER: Abudukade M 

PROVIDER: S-EPMC11440603 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature