ABSTRACT
Single crystal electrodes have attracted practical interest for nearly 50 years (Refs. [1-8], and references therein). They are employed in experiments that bene†t from surfaces that in principle are contaminant free, possess long range atomic order, and can be characterized down to the atomic length scale [1,2,4,9]. The latter properties provide knowledge of the surface structure and surface atom density. The surface atom density is an important quantity, because it enables adsorbate coverages and catalytic reaction rates to be expressed relative to the number of atoms present on the electrode surface [9]. The overwhelming majority of studies involving single crystals as working electrodes are based on the use of Pt-group (Pt, Ir, Rh, Pd, Ru) and coinage (Au, Ag, Cu, Ni) metals [1,2,4,6,8-10]. Carbon, mainly in the form of highly ordered pyrolytic graphite, also has been productively employed [11-13].
