Compressive Stress and Charge Redistribution during CO Adsorption Onto Pt

Electroorganic reactions, where energy is either stored or released from chemical bonds within carbon-based molecules, are essential to help achieve a circular economy. Central electrochemical conversion of organic molecules carbon monoxide (CO), which serves as both an intermediate in CO 2 reduction hydrocarbons and oxidation fuel cells that operate via oxygenated (e.g., ethanol, methanol). For the latter, Pt has been predominate catalyst choice, substantial effort spent identify mechanistic details for complete alcohol-based fuels. With serving important if not rate-limiting step oxidative process, it critical understand state catalytic surface when present. The change stress associated with adsorption stripping on (111)-textured examined using wafer curvature method 0.1 mol/L KHCO 3 electrolyte. 1 cantilever electrode was monitored function potential free CO-saturated Although adsorbs neutral molecule, significant compressive stress, up -1.3 N/m, induced Pt. magnitude correlates directly coverage, detection limits measurement, elastically reversible. Density functional theory calculations bound indicate charge redistribution first atomic layer subsurface layers account observed by CO. A better understanding adsorbate-induced development materials platforms sensing catalysis. References D. Raciti, K.A. Schwarz, J. Vinson, G.R. Stafford, Journal Physical Chemistry C , 126, 4446-4457 (2022).