编号：CYYJ03357

篇名：粉末粒径对等离子喷涂固体氧化物燃料电池阳极微观结构及性能的影响

作者： 朱志刚 宋琛 胡永俊 邓畅光 刘太楷 文魁 董东东 毛杰 刘敏

关键词： 阳极 粉末粒径 等离子喷涂 微观结构 固体氧化物燃料电池

机构： 广东工业大学材料与能源学院 广东省科学院新材料研究所/现代材料表面工程技术国家工程实验室/广东省现代表面工程技术重点实验室

摘要： As a solid oxide fuel cell anode material,NiO/Gd0.2Ce0.8O1.9(GDC)is used to replace the conventional NiO/Y0.16Zr0.92O2.08,which can effectively extend the triple-phase boundaries and improve the cell performance.In this paper,the evolution of anode microstructure and its effect on cell performance is studied by regulating the particle size of NiO/GDC agglomerated powder via atmospheric plasma spraying technique.The results show that the powder particle size affects the melting degree,and the small particle size powder melts sufficiently so that more GDC is exposed in the coating to increase the reactive sites.The large particle size powder melts insufficiently,and particle stacking creates gaps leading to more cracks and pores in the coating,thus exhibiting a larger gas flux with a leakage rate of 14.8×10-6 cm4·gf-1·s-1.The output peak power density of single cells formed by anode with small and large particle sizes is close to each other,reaching 1158.46 and 1147.0 mW·cm-2 at 800℃.The impedance spectrum fitting reveals the difference in interfacial charge transfer and gas transport capability of the anodes.By analyzing the mechanism of powder particle size on electrochemical performance,it was found that the small-particle-size anode has more interfacial active sites and shows a faster charge transfer rate,while the largeparticle-size anode has excellent gas permeability and can pass through more fuel to effectively excite active sites.Therefore,the two cells exhibit almost the same electrochemical performance.