8 to 120 nm-thick Pt coatings were sputter-deposited on Yttria-Stabilised Zirconia(YSZ)membranes,17 mm in diameter,by magnetron sputtering of a Pt target at low pressure(0.3 Pa).The catalytic activity of propane combustion under open-circuit conditions is first measured near to the stoichiometry(0.2%C_3H_8/l%O_2)and shows that the coatings present a rather high catalytic activity.Close-circuit measurements were finally performed at 337 deg C and 400 deg C.They show that rather high faradaic efficiencies in the range 10~6 can be reached as soon as the Pt film is thick enough to allow a bias of its whole area.
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