Process Exploration And Research Of Thin Film Solid Oxide Fuel Cell Based On Doped Ceria

In the past decade of entering the new era,the energy crisis has become increasingly intense.The government has issued a series of policies to promote the development of new energy,leading to a sharp increase in the attention paid to fuel cells from top to bottom.As one of the typical categories of fuel cells,solid oxide fuel cells(SOFCs)have been greatly sought after due to their significant advantages such as high efficiency,no pollution,and excellent fuel flexibility.However,due to the traditional and most typical electrolyte material,yttria stabilized zirconia(YSZ)needs to be exposed to high temperatures(above 800 ℃)to produce sufficiently high ionic conductivity,thereby achieving high power output.This has caused serious problems in manufacturing costs and practical applications of SOFC,which severely restricts the development of SOFC.Researching and exploring new electrolyte materials with high ionic conductivity in the middle and low temperature regions and thinning the electrolyte are two highly feasible operations that can effectively reduce the operating temperature of SOFCs.Compared to YSZ,a traditional typical material,doped cerium oxide has higher ionic conductivity in the mid and low temperature regions.Therefore,this article focuses on the application of cerium oxide doped electrolyte materials in solid oxide fuel cells using screen printing methods.(1)A thin film solid oxide fuel cell made of fluorite-type electrolyte slurry mainly composed of LaCePr Nd(LCPN)was prepared.Using LCPN as an electrolyte and sodium silicate solution as a binder,LCPN thin films were prepared by screen printing on nickel cobalt aluminum lithium oxide(NCAL)anode substrates with different thicknesses.The microstructure,morphology,and electrochemical properties of fuel cells were characterized and studied using XRD,SEM,EDS,and EIS.The experimental results show that the fuel cell prepared with 0.4 g NCAL as the anode substrate has the best performance,achieving a good output performance of 0.961 V open circuit voltage(OCV)and a maximum power density of 687 m W/cm2 at 550 ℃.These findings indicate that there is an optimal solution for the thickness of the anode substrate,and the performance of the fuel cell can be optimized through regulation.(2)A thin film solid oxide fuel cell with a two-layer electrolyte structure was prepared using LaCePr(LCP)and LSCF as electrolytes.The anode material and LCP are molded together to form a half cell,and LSCF slurry is brushed on the half cell.After completion,the cathode is assembled to obtain an assembled fuel cell with a double electrolyte structure.The analysis of the electrochemical performance,impedance,related elements,and microstructure of the battery showed that the brush coating thickness of the electrolyte had a significant impact on the battery performance.The fuel cell with a two-layer structure coated with two layers of LSCF has the best performance and excellent low-temperature performance,with an open circuit voltage of 1.012 V and an output power density of 562 m W/cm2 at 450 ℃.These findings indicate that there is an optimal choice of the thickness of the LSCF thin layer of the electrolyte layer,which can optimize the performance and output of the fuel cell with this structure under a low temperature environment of 450 ℃.The research in this paper is mainly based on the research of SOFC doped with cerium oxide electrolyte.Through improving the construction process of the electrolyte layer,using thin film technology and the method of constructing a double layer electrolyte layer,the overall device structure is optimized.The relevant research results show that this optimization and improvement strategy for the electrolyte layer is effective,ensuring sufficient excellent output performance of the device while reducing the operating temperature of the fuel cell.This study provides further experimental and theoretical support for the low-temperature development of solid oxide fuel cells,and provides more options for promoting the commercial development of solid oxide fuel cells.