The electrochemical behaviour of platinum single crystal electrodes in carbohydrazide containing solutions has been investigated by means of cyclic voltammetry and in situ FTIR spectroscopy. The spectroscopic and voltammetric results have shown that the main reaction path of carbohydrazide oxidation goes through formation of COads at potentials between 0.2 and 0.4 V RHE. At potentials higher than 0.4 V, a direct oxidation path to CO2 can be proposed. On Pt(100) and Pt(111) a second reaction path involves the cleavage of N-N bonds leading to the formation of semicarbazide and urea at potentials below 0.25 V. Formation of adsorbed urea and NO has also been detected at potentials higher than 0.5 V on these surfaces. On Pt(110), the fast formation of adsorbed CO impedes other possible reaction pathways.