(62b) Electronic Structure Tuning of Cu-Free Intermetallic Electrocatalysts for CO Reduction
AIChE Annual Meeting
2020 Virtual AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Electrochemical CO2 Conversion I
Monday, November 16, 2020 - 8:15am to 8:30am
In this presentation, we will explore the hypothesis that the unique d-band structure of Cu enables it to catalyze the reduction of CO2 to hydrocarbons and alcohols by synthesizing Cu-free intermetallic alloys with nearly identical d-band structures. We will demonstrate the extent to which the d-band structure of Pd can be modified by intermetallic bonding. However, we will also demonstrate that significant composition gradients form in the near-surface region of such intermetallic alloys nearly instantaneously upon air exposure. This observation provides a potential explanation for the poor CO2 reduction activity reported over similar Cu-free intermetallic electrocatalysts in the recent literature. To address this issue, we propose and validate a generic methodology that prevents the formation of these near-surface composition gradients by protecting the intermetallic surface with a sacrificial passivating overlayer. Finally, we will systematically demonstrate the impact of d-band structure on the CO reduction activity of these Cu-free Pd-based intermetallic electrocatalysts.