Abstract
The structural effect of Pt nanoparticles on formic acid oxidation was studied using Pt electrochemically deposited on glassy carbon as a model system. The morphology of Pt deposited on glassy carbon is defined by agglomerates whose number, size, and distribution depend on Pt loading and support pretreatment as revealed by atomic force microscopy characterization. A scanning tunneling microscopy analysis of the electrodes showed that an increase of Pt loading leads to an increase of Pt particles size and their coalescences. Electrochemical treatment of the support prior to Pt deposition results in a decrease of the particle size on acidic treated support and in their negligible change on alkaline treated support. The coalescences of the particles detected cause the formation of different defects. The most active are the electrodes with the smallest Pt loading, and with the support treated in acid having the lowest defected surface and the highest contribution of high coordinated (111) facets exposed to the reaction. The activity of the electrode decreases as the number of defects grows with increasing of the loading or with alkaline pretreatment of support, i.e., coalescence of the particles. The results obtained suggest that the ratio between the facets and the defect sites rather than particle size determines the rate of the formic acid oxidation.
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