The Application Study Of The Porous Electrode Of SOFC Fabricated By Plasma Spray

Solid oxide full cell is got high attention because it is a green energy source switch equipment of high efficiency, environment-friendly. The plasma spraying is a law have not accept base material dimension, spraying material waits for condition to restrict, has clear superiority in the field of the fleetness , the low cost preparation SOFC component. Consequently, base on plasma spraying prepares SOFC component research, which will contribute the high-efficiency and low cost fabrication of SOFC, and have great research value.Restrict fuel cell function and their applicative major factor lying in PEN (positive electrode/ electrolyte/ negative electrode) function, the positive electrode and the negative electrode are playing very important role to entire battery, the positive electrode and the negative electrode porosity effect are that the fuel gas and oxygen easy to diffuse mainly catalyze reaction by getting to the three-phase interface, enhancing surface catalytic reaction. The porous effect also has direct impact to its electricity function. And, plasma spraying is used commendably in fabrication of porous thin-film electrode because of its high-effect, convenience and not is restricted by material. Therefore, this paper make use of the plasma spraying which has done correlative techniques'research in the field of pore-forming the positive electrode and improving the porosity negative electrode.Specifically for the positive electrode, bring forward the pore-forming method adopting to add charcoal active(powder), using the plasma spraying technology, by adjusting the technology parameter and corresponding post-processing craft, gaining porous electrode layers. And, this paper has carried out first step investigation and discussion on adding solubility salt (industry common salt and tripotassium phosphate). Have suggested that the anode powder making use of a thermosetting resin to cover package expects improve the distribution of porosity. The negative electrode layer and electrolyte layer being in progress are based on material characteristic property by changing technology parameter. The experiment is 15%'s activated carbon powder by adding a mass ratio, by away of ball milling together with positive electrode powder Ni/YSZ, and the powder by the fact that certain technology such that according with request, acquiring the spraying powder which contains the pore-forming agent, obtaining the fairly good porosity by plasma spraying and the additionally corresponding post-processing. The morphology, element distribution and component on every PEN layer are analyzed by scanning electron microscope, acquiring the porosity of the better anode layer, electrolyte, cathode layer were 30.2%, 5.2%, 39% by making use of the Image-Pro Plus image analyze software.Besides, the experiment has investigated preliminary on the PEN bonding between the layer and layer. Achieving gradient powder feeding system by using equipment with three tubes of laboratory self-restraint, which reached continuous and gradient transition between anode layer and electrolyte layer, electrolyte layer and cathode layer. The thickness of transition is 15~20μm, whose merit depends on the technology having resolved the inharmonious coefficient of thermal expansion problem between layer and layer, having used the plasma spraying mainly is used for architectural preparation of the PEN better.