Unique CO-tolerance of Pt–WO_x materials

Fabrice Micoud (1) , Frédéric Maillard (1) , A. Gourgaud (1) , Marian Chatenet (1)

1 LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces

Well-defined tungsten-oxide-supported platinum nanoparticles (Pt/WO_x) were elaborated by impregnation-reduction of a platinum salt onto commercial monoclinic WO₃. Field-emission gun scanning electron microscopy (FEG-SEM) and transmission electron microscopy (TEM) revealed that the Pt particles are well-distributed on the oxide support, present a narrow particle size distribution centered on ca. 2–3 nm and a low degree of agglomeration. Carbon black was added to ensure electronic percolation in the electrodes during the electrochemical measurements. CO_ads electrooxidation currents were monitored at potentials as low as 0.1 V vs. RHE on Pt/WO_x, demonstrating high CO-tolerance compared to carbon-supported Pt or PtRu catalysts.

Mots clés: CO-tolerance; Nanoparticle; Platinum; Tungsten oxide; PEMFC

Domaines: Matériaux

Fabrice Micoud, Frédéric Maillard, A. Gourgaud, Marian Chatenet. Unique CO-tolerance of Pt–WO_x materials. Electrochemistry Communications, 2009, 11 (3), pp. 651-654. ⟨10.1016/j.elecom.2009.01.007⟩. ⟨hal-00417322⟩