Hole conductivity in the electrolyte of proton-conducting SOFC: Mathematical model and experimental investigation

摘要: Abstract Proton-conducting solid oxide fuel cell (SOFC) is promising for the intermediate and low temperature applications. The hole conductivity within electrolyte has noticeable impact on performance. In this article, a new model proposed to evaluate of directly. Single cells with different thicknesses are fabricated validate our model. BaCe 0.7 Zr 0.1 Y 0.2 O 3 − δ Sm 0.5 Sr CoO - Ce 0.8 2 cathode employed in experiments. predicted output capacities accord both experiments reported results, confirming that method valid effective. There several distinct features compared previous reports: 1) Hole could be evaluated directly from measured voltages full cell, thus it simplifies relevant experiment; 2) order make reaction transferable among samples diverse micro-structures, parameters named TPB-specific exchange current density proposed; 3) proton-conducting SOFC, an equivalent circuit consideration various overpotentials firstly proposed. Our points out influence capacity not neglected cases relatively current, high thin membrane. Therefore must taken into related simulations.