(726g) Rational Design of Intermetallic Electrocatalysts for CO Reduction
AIChE Annual Meeting
2019 AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Electrochemical CO2 Reduction II: Chemicals
Thursday, November 14, 2019 - 5:18pm to 5:36pm
In this presentation we will outline a rational means of designing Cu-free intermetallic electrocatalysts for CO reduction in alkaline media that utilizes the d-band valence electronic structure as the descriptor of electrocatalytic activity. We will demonstrate how the d-band valence electronic structure of transition metals can be systematically modified via the formation of strong intermetallic bonds with electronically dissimilar metals and how such modifications impact their electrocatalytic activity. We will demonstrate that composition gradients form in the near-surface region of such intermetallic alloys upon air exposure using both x-ray photoelectron and ion scattering spectroscopies. Unfortunately, these previously unidentified near-surface composition gradients cast doubts on the conclusions of prior studies of the electrocatalytic activity of similar intermetallic systems for CO and CO2 reduction. Finally, we will present a novel experimental methodology that enables the formation of these near-surface composition gradients to be completely avoided.