Hydrocarbon Fueled Solid Oxide Fuel Cell Performance Study

Solid oxide fuel cell?SOFC?is an efficient,pollution-free,low-cost and sustainable energy conversion device.Developing SOFC is one of the effective ways to solve the human energy crisis.In this paper,the key materials,structures and properties of SOFC fueled by hydrocarbons are studied.The specific research contents are as follows:Four kinds of electrolytes materials SDC(Ce_0.8Sm_0.2O_1.9)?GDC(Gd_0.9.9 Sm_0.1O_1.95)?NSDC(Ce_0.8Sm_0.2O_1.9-20%Na₂CO₃)and NGDC(Gd_0.9.9 Sm_0.1O_1.95-20%Na₂CO₃)were made and compared.Using hydrogen as fuel,it was found that the NSDC electrolyte battery has the highest power density,reaching 450mW/cm².The effect of LCNC(Li_1.2Co_0.2Ni_1.5Cu_0.1O₃)for the discharge performance of NSDC electrolyte battery was studied.the composite electrolyte battery with a mass ratio of 1:3reached 520 mW/cm².It can work stably for more than 6.6h under constant current working condition of 0.45A/cm²;Using methanol aqueous solution as fuel,the maximum power density of the battery reaches 51.6mW/cm²,and the working stability time exceeds 5.8h.The 1:3 LCNC-NSDC composite electrolyte battery containing GNDC functional layer has a maximum power density of 74mW/cm²;It was found that the maximum power density of the battery decreased with the increase of the functional layer thickness and increased with the increase of methanol content.A three-dimensional model of SOFC fueled by methanol reforming gas was constructed using COMSOL 5.4 software.Under different working voltages,the oxygen concentration is gradually distributed along the flow direction in the air flow channel and the cathode reaction layer and gradually decreases.The oxygen concentration in the middle region of the electrode is higher than the concentration on both sides;The distribution of the current density is consistent with the oxygen concentration distribution.It has been found that increasing the air flow rate will improve the anoxic condition at the end of the flow channel.However,if the flow rate is too high,eddy current will form at the end of the flow channel.The maximum power density of the battery increases with the increase of the flow rate,but the growth rate decreases.The model relies on the flow rate.The maximum power density obtained is about 173mW/cm²;the power density increases with the increase of working temperature,and the increase increases with the increase of temperature,reaching 195mW/cm² at T=873K;battery performance with porosity The increase is gradually increased,and the battery power density reaches 173 mW/cm²at?=0.6;the lower the porosity,the more obvious the influence of concentration polarization.