Preparation And Properties Of The Composite Cathode Of The SOFC Nanostructures

Solid oxide fuel cell (SOFC) is a generating device that can convert chemicalenergy to the new electric energy. It has become the focus on international, but atthis stage of SOFC is still research stage in the laboratory. The most importantreason is about the cost of materials. How to reduce costs to improve theperformance of the material is the most important of all need to be resolved. In thestudy, mainly through the study of SOFC cathode structure, improve theperformance of the cathode material in the low-temperature working conditions, toachieve the goal of reducing costs. The main object of this study is the LSCF-GDCand the LSM-YSZ composite cathodes, through the exploration of two compositecathodes structure, can increase their performance in low temperatures.In this study, first with nano-fiber structure electrolyte materials prepared byelectrostatic spinning method, micro-nano structure by sintering method constructedcathode in the electrolyte above; impregnation method and then use the compositecathode in the electrolyte skeleton of the above structure. Mainly through thesintering conditions on the skeleton and the control of the content and methods ofimpregnation, the structure has better micro structure of the composite cathodeduring the experiment.Cathode materials and electrolyte assembled into a half battery. At differenttemperatures, the test compound cathode impedance spectroscopy, resulting indifferent kinds of composite cathode electrochemical performance under differentoperating temperature. At800℃,the LSM-YSZ composite cathode polarizationresistance can be achieved0.212Ω·cm~2.At750℃, it can be achieved0.495Ω·cm~2,and700℃is0.511Ω·cm~2. At700℃, the polarization impedance of LSCF-GDCcomposite cathode is0.0157Ω·cm~2,650℃can be achieved0.125Ω·cm~2and at600℃0.21Ω·cm~2. Through the work of this paper, these two composite cathodeperformance in the low temperature has been some improvement, can also provethat the structure of the composite cathode has great prospects for development.