Figure 3.

Electrochemical oxidation of a carbon monoxide monolayer (CO-stripping curves) after 0, 360, 1080, 2160, 3600, 5400, 7200 and 10800 degradation cycles for Pt/Vulcan 3–4 nm, Pt@HGS 1–2 nm and Pt@HGS 3–4 nm. The degradation cycles are performed between 0.4 and 1.4 V_RHE with a scan rate of 1 V·s⁻¹ without rotation at room temperature in argon-saturated 0.1 M HClO₄ (not shown). CO-stripping voltammograms (top) were recorded between 0.05 and 1.2 V_RHE at a scan rate of 0.05 V·s⁻¹ to measure the ECSA versus the number of cycles (bottom). The CO-stripping voltammograms of Pt@HGS 3–4 nm are reprinted with permission from [71]. Copyright 2012 American Chemical Society.