In-situ Stress Measurements During CO Adsorption onto Pt
David Raciti, Gery R. Stafford, Kathleen Schwarz, John Vinson
The change in surface stress associated with the adsorption and oxidative stripping of carbon monoxide (CO) on (111)-textured Pt is examined using the wafer curvature method in 0.1 M KHCO3 electrolyte. The curvature of the Pt cantilever electrode was monitored as a function of potential in both CO free and CO-saturated electrolyte. Although CO adsorbs as a neutral molecule, significant compressive stress is induced into the Pt. The magnitude of the stress change correlates first order with the CO coverage, and within the detection limits of the stress measurement, is elastically reversible. Density functional theory calculations of a CO bound Pt surface indicate that charge redistribution from the first atomic layer of Pt to subsurface layers account for the observed compressive stress induced by the charge neutral adsorption of CO. A better understanding of adsorbate-induced surface stress is critical for the development of materials platforms for sensing and catalysis.
, Stafford, G.
, Schwarz, K.
and Vinson, J.
In-situ Stress Measurements During CO Adsorption onto Pt, Journal of Physical Chemistry C, [online], https://doi.org/10.1021/acs.jpcc.2c00134, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=933911
(Accessed November 28, 2023)