Operando XAS of dewetted Ni nanoparticles on SrTiO3 single crystals for photocatalytic water splitting: A model system to study Ni stability

Ni is a promising co-catalyst for photocatalytic water splitting but it suffers from activity decay. We will use time-resolved operando XAS to investigate the deactivation mechanism of a model system based on dewetted Ni nanoparticles on SrTiO 3 single crystals. Results will enable rational design of photocatalysts based, e.g., on faceted metal oxide particles where HER and OER co-catalysts are site-selectively decorated on electron- and hole-collecting facets, respectively.