To understand how the CO oxidation reaction proceeds on nanoparticles, which have complex surface structures, the behavior of the nanoparticles for the reaction has to be related to that of single crystal electrodes with a well-defined surface structure.However, the direct extrapolation of the results is not possible because significant differences in the behavior between both type of surfaces are observed. In single crystal electrodes in both acidic and alkaline media, the reaction initiates on defects on the CO adlayer. These defects can be already present on the surface, as surface defects or steps, or generated during the formation of the CO adlayer. In the case of steps, the oxidation starts on the lower part of the step. The only difference between the reaction behavior between acidic and alkaline solutions is the lower mobility of the CO in alkaline solutions, which generates adlayers with higher number of defects and give rise to multiple stripping peaks in stepped surfaces. Using these results, the differences of the behavior between single crystal electrodes and nanoparticles can be rationalized. In spite of the fact that nanoparticles have small ordered domains, the presence of sites in which the reaction is initiated, equivalent to the site in the lower part of the step, is almost negligible, and thus, the oxidation reaction takes place at higher potential values
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ACCEPTED MANUSCRIPT2 than in stepped surfaces with similar domain size. Also the effect of nanoparticle agglomeration in the oxidation has been rationalized.nanomaterials [8][9][10][11][12][13][14][15][16][17]. Regarding the electrochemical characterization of Pt surfaces, this type of studies has been mainly performed in acid medium. It is important to bear in mind that for this purpose, it has to be considered that the nanoparticles are not perfect surfaces, showing different type of sites on their surfaces. In addition, and unlike single crystal basal planes, which present ideal infinite terraces, nanoparticles possess shorter and narrower ordered domains. Even in the case of stepped surfaces where the width of the terrace is controlled, the length of the terrace is ideally infinite. The first manuscript where CO oxidation was evaluated with shape-controlled nanoparticles was reported by