(186d) Indium (Hydroxy)Oxide Films on Platinum Nanoparticles for CO Electrooxidation
AIChE Annual Meeting
2020
2020 Virtual AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Electrocatalysis II: Organic Electrocatalysis
Tuesday, November 17, 2020 - 8:45am to 9:00am
In this work, we employ first-principles calculations on various indium (hydroxy)oxide films on a Pt(111) substrate to explain the process by which this system achieves low overpotentials for CO electrooxidation. Our results show that the stability range of indium (hydroxy)oxide phases is modified when these phases are present as a monolayer on Pt(111) as compared to the range of stabilities predicted from bulk energetics alone. Further, phases that have been underexplored in the literature, such as InOOH and In(OH)3, are shown to be relevant under CO oxidation conditions. In addition, hydroxylated In2O3(111) demonstrated distinctive stability trends as compared to films of In2O3 alone. The effect of the stability trends in these unique surface phases on CO oxidation are then analyzed, and the results are used to explain the low, observed experimental overpotential. These results suggest that this indium catalyst may be suitable for other bifunctional, electrochemical reactions such as the hydrogen evolution reaction, and also argue for the consideration of metals beyond transition metals for similar reactions.