| Solid Oxide Fuel Cell (SOFC) is an energy conversion device that can transform chemical energy in fuels directly into electrical energy. As a new energy technology, it has the advantages of energy conversion efficiency, less pollution to environment, fuel adaptability, etc., from the energy strategies for sustainable development and the protection of the environment point of view, the fuel cell has great prospects for developments. Therefore, it has attracted world wide attention and research.After two decades of rapid development, solid oxide fuel cell technology has begun to move toward marketization and industrialization. In order to reduce the cost of manufacture and use, an important issue for the current solid oxide fuel cell technology is by making thinner electrolyte membrane to achieve low temperature operation. And the preparation of low-cost, high activity, large-scale implementation of the cathode material is one of the keys to the low-temperature SOFC.The main research of this thesis lies in the cathode material synthesis and porous anode support the preparation of dense electrolyte membrane, and on this basis, explores the preparation process of the intermiddle temperature SOFC(IT-SOFC), and the characterization and evaluation of single cell performance are carried out at last. Specific tasks are as follows:Chapter 1 outlines research background and significance of this thesis, a brief introduction of the SOFC development history, working principle, the key materials (electrolyte, cathode, anode, sealing materials, etc.) performance requirements, as well as the SOFC technology research, development status and trends. Finally, proposes the main research objective of this paper.The second chapter analyzes the characteristics of SOFC materials and synthesis process of the powders, studies influence of anode materials in different systems to single-cell preparation and its performance. Experimental results show that a good anode structure is affected by the ratio of each anode materials component, milling conditions, the vacuum exhaust time, the external environment and sintering processes. Then prepares the cathode material La0.6Sr0.4CoO3 (LSC) by Glycine-nitrate Process method, calcination and milling, then analyses the powders performance by means of particle size analyzer, TGA, XRD and BET methods and so on. At last, obtains the appropriate calcination temperature and milling time for cathode material preparation.Chapter 3 explores specific production processes of the single cell, develops a set of plate IT-SOFC single cell process scheme by using tape casting and screen printing methods, and discusses the co-sintering process of the anode/electrolyte composite body, also studies the sintering process of the single-cell, analyses defects occurred during sintering, such as warpage, layered peeling, cracking and loose, and finally proposes the related improve measures.Chapter 4 outlines a single cell assembly and conducts of a single cell performance test. The results show that the structure in the plate IT-SOFC single cell at the working temperature of 800℃, obtains open-circuit voltage of 1.10V, maximum power of 0.855W/cm2 and the maximum current density of 1250mA/cm2.Chapter 5 summarizes the initial results obtained by the present, proposes problems found in the premiary experiment process and the corresponding measures for improvement, and finally put forward direction for future research prospects. |
