How to make an efficient gas-phase heterogeneous CO2 hydrogenation photocatalyst

Abstract

Tailoring the performance of a photocatalyst by design is challenge in the field of renewable synthetic fuels. Herein, polymorphic heterostructures comprised of two indium oxide based photocatalysts, with distinct structures yet continuously adjustable fractions of the same composition, enable optimization of the activity and selectivity of CO₂ hydrogenation to CO and CH₃OH. The strategy rests on the cubic (c-) to rhombohedral (rh-) indium oxide hydroxide In₂O_3−x(OH)_y phase transition, in which the fraction of the cubic phase that nucleates and grows within the rhombohedral phase is under precise structural and compositional control. Interfaces so-formed between cubic and rhombohedral polymorphs with distinct electronic band structures as well as separate locations of electron trapping oxygen vacancies and hole trapping hydroxyl defects in individual In₂O_3−x(OH)_y components, enable charge generation, separation and lifetimes of photogenerated electron–hole pairs to be finely tuned. This facilitates command over H₂ and CO₂ surface chemical reactions that are responsible for the activity and selectivity towards products CO and CH₃OH. The control over the performance metrics of a CO₂ hydrogenation photocatalyst provided by tuneable rh/c-In₂O_3−x(OH)_y polymorphic heterostructures, affords promising opportunities for the future development of renewable synthetic fuels.