TY - JOUR
T1 - EMF measurements on mixed protonic/electronic conductors for hydrogen membrane applications
AU - Bentzer, Henrik Karnøe
AU - Bonanos, Nikolaos
AU - Phair, John
PY - 2010
Y1 - 2010
N2 - Electromotive force (EMF) measurements are often used to estimate the transport number of conducting species in ionic and mixed conductors. In this work, the applicability of the method to systems, where both protonic, oxide-ionic and electronic conduction is significant, was examined. The effect of electrode polarisation resistance, water vapour concentration and impurities was analysed. Samples of SrCe0.95Y0.05O3 − δ were prepared and used in a number of EMF measurements, including wet and dry hydrogen and oxygen concentration cells. It was found that concentration cells including water vapour gave large errors in the determination of the oxide-ionic transport number, but gave good estimates of the protonic transport number. The protonic transport number was estimated to around 0.80 at 600 °C, decreasing to around 0.65 at 800 °C, consistent with previous investigations on similar materials.
AB - Electromotive force (EMF) measurements are often used to estimate the transport number of conducting species in ionic and mixed conductors. In this work, the applicability of the method to systems, where both protonic, oxide-ionic and electronic conduction is significant, was examined. The effect of electrode polarisation resistance, water vapour concentration and impurities was analysed. Samples of SrCe0.95Y0.05O3 − δ were prepared and used in a number of EMF measurements, including wet and dry hydrogen and oxygen concentration cells. It was found that concentration cells including water vapour gave large errors in the determination of the oxide-ionic transport number, but gave good estimates of the protonic transport number. The protonic transport number was estimated to around 0.80 at 600 °C, decreasing to around 0.65 at 800 °C, consistent with previous investigations on similar materials.
KW - Fuel Cells and hydrogen
KW - Membranes
KW - Brændselsceller og brint
KW - Membraner
U2 - 10.1016/j.ssi.2009.11.002
DO - 10.1016/j.ssi.2009.11.002
M3 - Journal article
VL - 181
SP - 249
EP - 255
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
IS - 3-4
ER -