The water gas shift reaction (WGS) was studied in a proton-conducting cell-reactor at 873-1023 K and atmospheric total pressure. The proton conductor was a strontia-zirconia-yttria perovskite disk of the form: SrZr0.95Y0.05O3-alpha. A polycrystalline palladium film was used as the working electrode-catalyst. The reaction kinetics were evaluated with the cell operating under open circuit. Under closed circuit and with protons "pumped" away from the catalyst, the rate of H-2 formation increased to a moderate extent. The Faradaic efficiency (Lambda) was found to attain values as high as Lambda = 8, while the highest rate enhancement ratio (rho) measured was rho=2. The Proton Transport Number (PTN) varied between 0.40 and 1.0. (C) 2007 Elsevier B.V. All rights reserved.