H. Shiga et al., PREPARATION OF NANOSTRUCTURED PLATINUM YTTRIA-STABILIZED ZIRCONIA CERMET BY THE SOL-GEL METHOD/, Industrial & engineering chemistry research, 35(12), 1996, pp. 4479-4486
Nanostructured platinum/yttria-stabilized zirconia (YSZ) cermet (compo
site of ceramics and metal) is obtained by the sol-gel method. Influen
ces of the processing parameters on the nanostructure are experimental
ly studied using X-ray diffraction, held emission scanning electron mi
croscopy, electron probe microanalysis, and nitrogen adsorption. The n
anostructure of-the cermet is controlled by the Pt/YSZ ratio, gelling
procedure, and calcination temperature. The slower gelling or higher t
emperature calcination enlarges the YSZ grain size, The addition of a
smaller amount of Pt or calcination at higher temperatures reduce the
Brunauer-Emmett-Teller (BET) surface area when calcined at 973 K or ab
ove. The addition of a larger amount of Pt increases the porosity when
calcined at 973 K or above. By controlling the conditions of synthesi
s, gelling, and Pt content, the average YSZ grain size was kept within
50 inn after calcination at 1173 K.