Development of new systems of nano-disperse Pt-(2%Pt-Ce0.9W0.1O2)/C electrocatalysts tolerant to carbon monoxide (CO) for PEMFC anodes

The nanophase material (powder) of Ce0.9W0.1O2 was synthesized via coprecipitation of oxalates of cerium (IV) and tungsten cations. Pt-Ce0.9W0.1O2 (2 wt% Pt) was prepared by an alcohol-reduction process using H2PtCl6.6H2O as source of Pt, Ce0.9W0.1O2 as support and ethylene glycol as solvent and reducing agent. Pt-Ce0.9W0.1O2 was physically mixed with commercial Pt/C E-TEK (20 w% Pt) to produce the Pt-(2%Pt-Ce0.9W0.1O2)/C electrocatalyst. The prepared electrocatalysts were characterized by energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and CO stripping. The performances of Pt/C E-TEK and Pt-(2%Pt-Ce0.9W0.1O2)/C electrocatalysts were tested in single fuel cell fed with a mixture H2/CO (100 ppm of CO). The results showed that the mixture of 2%Pt-Ce0.9W0.1O2 and Pt/C E-TEK increases the CO tolerance in a single fuel cell operating at 85 ºC compared with Pt/C E-TEK

Development Of New Systems Of Nano-disperse Pt-(2%pt-ce0.9w 0.1o2)/c Electrocatalysts Tolerant To Carbon Monoxide (co) For Pemfc Anodes

The nanophase material (powder) of Ce0.9W0.1O 2 was synthesized via coprecipitation of oxalates of cerium (IV) and tungsten cations. Pt-Ce0.9W0.1O2 (2 wt% Pt) was prepared by an alcohol-reduction process using H2PtCl 6.6H2O as source of Pt, Ce0.9W 0.1O2 as support and ethylene glycol as solvent and reducing agent. Pt-Ce0.9W0.1O2 was physically mixed with commercial Pt/C E-TEK (20 w% Pt) to produce the Pt-(2%Pt-Ce 0.9W0.1O2)/C electrocatalyst. The prepared electrocatalysts were characterized by energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and CO stripping. The performances of Pt/C E-TEK and Pt-(2%Pt-Ce0.9W0.1O2)/C electrocatalysts were tested in single fuel cell fed with a mixture H2/CO (100 ppm of CO). The results showed that the mixture of 2%Pt-Ce0.9W 0.1O2 and Pt/C E-TEK increases the CO tolerance in a single fuel cell operating at 85°C compared with Pt/C E-TEK. ©The Electrochemical Society.431185189Du Melle, F., The global and urban environment: The need for clean power systems (1998) Journal of Power Sources, 71 (1-2), pp. 7-11Oliveira Neto, A., Farias, A.L., Dias, R.R., Brandalise, M., Linardi, M., Spinacé, E.V., Enhanced electro-oxidation of ethanol using PtSn/CeO2-C electrocatalyst prepared by an alcohol-reduction process (2008) Electrochemistry Communications, 10 (9), pp. 1315-1317Pamqvist, A.E.C., Wirde, M., Gelius, U., Muhammed, M., Surfaces of Doped Nanophase Cerium Oxide Catalysts (1999) NanoStructured Materials, 11 (8), pp. 995-1007Rothenberg, G., De Graaf, E.A., Bliek, A., Solvent-Free Synthesis of Rechargeable Solid Oxygen Reservoirs for Clean Hydrogen Oxidation (2003) Angew. Chem. Int. Ed., (42), pp. 3366-3368. , BartGu, D.M., Chu, Y.Y., Wang, Z.B., Jiang, Z.Z., Yin, G.P., Liu, Y., Methanol oxidation on Pt/CeO2-C electrocatalyst prepared by microwave-assisted ethylene glycol process (2010) Applied Catalysis B: Environmental, 102 (1-2), pp. 9-18Hou, Z., Yi, B., Lin, Z., Zhang, H., CO tolerance of PtRu-HxMeO3/C (Me = W, Mo) made by composite support method (2003) Journal of Power Sources, 123 (2), pp. 116-125Santiago, E.I., Batista, M.S., Assaf, M.E., Ticianelli, E.A., Mechanism of CO tolerance on Molybdenum-Based Electrocatalysts for PEMFC (2004) Journal of the Electrochemical Society, 151 (7), pp. A944-A94