Characterization Of Solid Oxide Fuel Cell Film/Cubstrate System In Oxidation And Reduction

SOFC work is a kind of energy conversion system that chemical energy stored in fuelwill be directly transformed into electrical energy at a constant temperature. Compared withthe traditional thermoelectric conversion system, SOFC steps across the middle step betweenchemical energy and electrical energy. At the same time, the discharge amount of the gaspollutant is lower in the process of transformation, which is nearly equal to near zeroemissions. This SOCF is a kind of efficient and clean energy conversion system. Therefore,the reduction-oxidation research during the oxide fuel-cells work process supported by anodebecomes an important science and technology subject that need to be resolved urgently. Basedon this, this paper which is subsidized by the Nation Science Foundation Project “Study onfailure mode and characterization method of the longlife energy conversion in film/substratesystem structure” mainly research properties of fuel cell and half cell for solid oxidesupported by anode. It includes the changer of structure morphology, curve in reductionprocess and varition of residual stresses. And this paper describes the change law of anodesupported SOFC in operational process in-depth exploration. The mainly results are shown inthe following.1. It firstly measures the whole curve in reduction process of anode in fuel cell. Itobtains the change law of anode at different reduction temperatures and times. It also offersthe simulation analysis heat flow field in the environment in the reaction process. Thecontrols of temperature and the gas flow field are set up. The fuel cell is descripted accordingto thermodynamic theory. The process of reduction-oxidation is designed and test operationprocess for reduction-oxidation reaction is established.2. It finds the change law of resident stress of anode supported sofc at differrent redoxtemperature and time. It obtaines the resident stress declines with the increasing of reductiondegress and offers the declining feature. The influence of residual stress on the yield strengthof the electrolyte membrane is analysed. It is analysed the reasons of the plastic deformationand cracking.3. After this is researched, a few of layers including the electrolyte layer (surface andinterface), the interface between electrolyte layer and the anode support layer and anode layer(section, bottom) is characterized for structure. The microstructure and energy spectrummeasurement before and after the reduction reaction are compared.4. It is measured coefficient of thermal expansion, the stress and strain in the electrolytelayer of the anode supported sofc. The thermal expansion properties of half-cell after reduction and reoxidation reaction are studied.This paper has theoretical significance and practical value in engineering especiallyfor the operation of the fuel cell and its process improvement.