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A porous NiO-YSZ substrate for anode-supported solid oxide fuel cells has been prepared by gelcasting of NiO-YSZ powders using urea-formaldehyde monomers, followed by humidity-controlled drying, binder removal, and sintering of the gelled bodies. The gelled bodies had sufficient strength to remove even 2-mmthick samples from the mold immediately after gelation. A gelcast NiO-YSZ sample sintered at 14501C for 2 h showed an open porosity of B53 vol%, and the porosity increased to B58% upon reduction with hydrogen. Pore sizes measured on the scanning electron microscopy photomicrograph of NiO-YSZ and Ni-YSZ cermet substrates are in the range of 2-5 lm. Urea-formaldehyde polymer, present in a high amount (B13 wt%) in the gelcast body, acts as a template for pores. P. Holtappels-contributing editor