Some results of CO(2)/H(2)O electrolysis experiments performed to date using button cells and three different 10-cell planar solid oxide stacks are presented and discussed. These results include electrolysis performance at various temperatures, gas mixtures, and electrical settings. Product gas compositions, as measured via an in-line micro gas chromatograph (GC), are compared to predictions obtained from an INL-developed chemical equilibrium coelectrolysis model (CECM). Better understanding of the feasibility of producing syngas using high temperature electrolysis may initiate the systematic investigation of nuclear-powered synfuel production as a bridge to the future hydrogen economy and ultimate independence from foreign energy resources. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.