SOFC金属连接体抗Cr挥发成分调控及其对阴极毒化机理研究

项目名称： SOFC金属连接体抗Cr挥发成分调控及其对阴极毒化机理研究

项目编号： No.51271083

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 蒲健

作者单位： 华中科技大学

项目金额： 80万元

中文摘要： 固体氧化物燃料电池(SOFC)是高效、清洁的电化学发电装置，金属连接体是SOFC电堆的重要部件之一。常用的Fe-Cr基连接体合金将出现高温Cr挥发现象，并导致电池阴极毒化和性能衰减。在本项目中，通过成分设计与优化实现连接体合金表面复合氧化物膜的原位自生长，以及外层Mn-Cr尖晶石型氧化膜的化学成分、结构和形貌调控，从而达到抑制Cr挥发的目的。同时以La0.9Sr0.1MnO3阴极为敏感组元，将合金的Cr挥发与阴极的电化学性能变化相关联，对Cr挥发过程进行精确测量和定量研究，进而建立连接体合金Cr挥发的评价体系。利用计算机模拟和微观分析技术，探索气态Cr挥发物在多孔阴极的迁移、形核及沉积规律，及其对阴极氧还原性能的影响，并明晰三相界面和极化电流的作用。确定连接体合金Cr挥发与阴极性能衰减之间的联系，阐明Cr挥发对阴极的毒化作用机理，为开发抗Cr挥发的新型金属连接体提供理论依据。

中文关键词： 固体氧化物燃料电池；金属连接体；阴极；Cr毒化；涂层

英文摘要： Solid Oxide Fuel Cell (SOFC) is an electrochemical device which has high efficiency and low environment impact. Metallic interconnect play a key role in SOFC stack. Cathode poisoning by chromium from volatilization of Fe-Cr based metallic interconnect will greatly degrade cathode property. In this research, the in situ growth of duplex scales on Fe-Cr based metallic interconnect can be achieved by tuning the composition of alloys. In order to reduce Cr volatilization of metallic interconnect, the chemical composition, structure and micrography of the outer Mn-Cr spinel oxide layer will be optimized. The relationship between chromium volatilization of metallic interconnect and electrochemical parameters of SOFC cathode can be established when the La0.9Sr0.1MnO3 is used as a sensor, thus, the course of chromium volatilization can be accurately measured and investigated. Therefore, the evaluation system about chromium volatilization of interconnect alloy will be built up. The migration, nucleation and deposition of volatile chromium will be investigated by computational simulation and microstructure analytic technique to demonstrate the effect on oxygen reduction of cathode which it is helpful to illuminate the role of three phase boundary and polarization current. Based on understand the mechanism of cathode on ch

英文关键词： solid oxide fuel cell；metallic interconnect；cathode；Cr poisoning；coating