We report a fast method of producing rhodium-decorated platinum nanoparticles (NPs) containing iridium oxides (IrO<inf>x</inf>) to be used in the glycerol electrooxidation reaction. We synthesize PtIrO<inf>x</inf>/C electrocatalysts of different atomic compositions dispersed on Carbon Vulcan XC-72R® by using the fast polyol method assisted by microwaves. Afterwards, PtIrO<inf>x</inf>/C was potentiodynamically decorated by Rh (Rh/PtIrO<inf>x</inf>/C). The NPs are characterized by energy dispersive X-ray analysis, X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy. The electrooxidation of glycerol was investigated in acid medium by cyclic voltammetry and chronoamperometry. The electrochemical stability of Rh/PtIrO<inf>x</inf>/C NPs was evaluated by following a degradation test protocol, which consists in exhaustive cyclic voltammetries. 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