In-situ Stress Measurements During CO Adsorption onto Pt

Published

February 24, 2022

Author(s)

David Raciti, Gery R. Stafford, Kathleen Schwarz, John Vinson

Abstract

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.

Citation

Journal of Physical Chemistry C

Pub Type

Journals

Download Paper

https://doi.org/10.1021/acs.jpcc.2c00134

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Keywords

Stress, Platinum, Adsorption, Carbon Monoxide, Charge Redistribution, Oxidation

Citation

Raciti, D. , Stafford, G. , Schwarz, K. and Vinson, J. (2022), 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 January 14, 2025)