Optimization of Ni YSZ anodes for tubular SOFC by a novel and efficient phase inversion-impregnation approach

In this work, a novel phase inversion-impregnation method is developed for SOFC electrode optimization, in which the catalyst precursor solution is innovatively employed as the coagulation bath. Via this method, nanoscale transition metal Fe and Ni catalysts are successfully introduced into the Ni-YSZ anodes in one-step. The maximum power densities of Fe and Ni impregnated anode-supported SOFCs at 800 degrees C are improved from 0.38 W cm(-2) to 0.40 and 0.48 W cm(-2) in H-2 fuel while from 0.32 W cm(-2) to 0.37 and 0.45W cm(-2) in CH4 fuel. The upgraded cell performance is mainly attributed to the reduction of polarization resistance and the extending of the electron transfer path. In addition to the enhanced efficacy of Ni-YSZ anodes, the as-proposed novel approach would likely offer time and cost savings compared to traditional impregnation methods, exhibiting a promising application in fabricating SOFC electrodes. (C) 2018 Elsevier B.V. All rights reserved.