(513bf) Probing the Energetics of Model Photocatalyst/Co-Catalyst/Water Junction Interfaces
AIChE Annual Meeting
2020 Virtual AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Poster Session: Catalysis and Reaction Engineering (CRE) Division
Friday, November 20, 2020 - 8:00am to 9:00am
Photocatalytic water splitting is a promising approach for large-scale hydrogen production. However, the low efficiency of photocatalysts hinders their usage in practical applications. Understanding the energetics and kinetics at the liquid junction provides valuable insights into the operation of photocatalysts, and is therefore indispensable for improving the efficiency of photocatalyst systems. In this work, we first present a kinetic model for semiconductor/two-redox liquid junctions. We then show a characterization framework to simulate photocatalystsâ operation by using model photoelectrodes (SrTiO3 grown by Molecular Beam Epitaxy). We used ohmic back contacts to directly probe the quasi-fermi level at the liquid junction under operating conditions by measuring open-circuit potentials. Finally, we developed a semiconductor/liquid junction model based on kinetics and reversibility, using COMSOL Multiphysics package, to simulate semiconductor/two-redox liquid junctions and validate our experimental results.