New High-Entropy Perovskite Oxides with Increased Reducibility and Stability for Thermochemical Hydrogen Generation

Recipient University of California San Diego (PI: Jian Luo)

Subs West Virginia University (PI: Xingbo Liu) and Michigan State University (PI: Yue Qi)

Water Splitting Technology STCH

Abstract This project will design, synthesize and test a transformative class of High-Entropy Perovskite Oxides (HEPOs) as redox oxides to enable solar thermochemical hydrogen (STCH) generation with improved stability, kinetics and efficiency. These HEPOs are expected to demonstrate improved kinetics of oxygen surface exchange coefficient in Year 1, retain its structural stability in a broad range of oxygen nonstoichiometry at a low operating reduction temperature of Tred £ 1400°C in Year 2, and deliver a high H2 yield and high stability with low degradation in Year 3. This proposed project is feasible due to the unique thermodynamic properties (simultaneously increased reducibility and phase stability) and kinetic characters (stability against particle coarsening and enhanced oxygen transport and surface reaction kinetics) of such HEPOs, and it is enabled by a unique active learning computational design approach.