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(a) Potentiodynamic scan and (b) surface stress response (Δf) of a (111)-textured Pt cantilever electrode in 0.1 mol/L KHCO3, with (blue curve) and without (red curve) the CO-saturated electrolyte. Although Δf is arbitrarily set to 0 at the beginning of the experiment, the CO-sat stress curve in panel (b) was shifted along the stress axis to highlight the identical response with the CO-free curve in the PtO region. The sweep rate was 25 mV/s, and the solution pH was 9.5.
