等离子熔射制备梯度功能MOLB式SOFC及其复阻抗分析

Preparation and complex impedance analysis of functionally gradient PEN for MOLB-type SOFC by plasma spraying digital forming

关键词:  固体氧化物燃料电池  等离子熔射  梯度功能  三合一电极  复阻抗

Key words:  solid oxide fuel cell  plasma spraying  functional graded materials  positive electrolyte negative  complex impedance

摘要:

采用一种融合功能梯度材料设计思想与快速原型制造等离子熔射与机器人数字化成形技术于一体的新方法,借助自主研发的梯度功能送粉系统,多层连续熔射快速制造立体结构MOLB(mono-block layer built)式固体氧化物燃料电池SOFC(solid oxide fuel cell)三合一电极PEN(positive electrolyte negative)部件。分析了PEN部件的成分、微观组织和阳极、阴极孔隙率的连续梯度变化规律,并利用复阻抗技术对其进行导电性能测试。结果表明,采用该方法能够获得含有成分、组织呈连续梯度变化的功能涂层的SOFC核心部件PEN;与不含有梯度层的PEN相比,不仅提高电极与电解质间的匹配性,改善电极孔隙率及其分布;而且大幅度减小功能梯度PEN部件界面接触电阻,有助于提高SOFC的电性能。

Abstract:

The technology integrated the FGM design theory, the plasma spray, robot digital forming and rapid prototyping was presented.On the help of the functionally graded power feed device, the PEN was prepared continually, which was the core components of MOLB (mono-block layer built) type solid oxide fuel cell (SOFC).The variation of the elements, microstructure of PEN and porosity of electrodes were analyzed using E-probe and energy spectrum analysis.The electrical conductivity of composite electrode was also analyzed by the AC complex impedance technology.The results indicate that this method is successfully used into preparing the functionally gradient PEN including electrodes with high porous and gradient layers that ingredient and organization continuously vary.As a comparison, the match of components in the thermal expansion and other performance is enhanced, and the porosity and the porosity distribution are also improved.Moreover, the interface resistances between the electrodes and electrolyte sharply decrease than the PEN without the gradient layers, which is the advantage of improving the electrical performance of SOFC