固体氧化物燃料电池纳米结构阴极的构筑及中低温电化学性能

The electrocatalysis reaction rate at triple phase boundary (TPB) depends on the microstructure and component of electrodes, which further determine the electrochemical performances of solid oxide fuel cells (SOFCs). In this project, the microemulsion method will be employed to prepare like-perovskite A2BO4 nanostructured cathode. We will examine the effect of different microstructure (such as nanowires, nanotubes and nanoparticles) on the intermediate and low temperature electrochemical performance of the cathode, and the mechanism of oxygen reduction reaction (ORR) on the cathode. Through the control and fabrication microstructure of the cathode material, improve oxygen transport properties and catalytic active of electrode, elong the length of triple phase boundry for nanoelectrode. The oriented, higher ionic-electronic mixed conductivity with nickel and copper Ln2-xAxMO4 oxides are cathode materials. Ln=La,Pr,Nd, etc, rare earth; A=Sr，Ca，Ba, Alkali earth metals; M=Ni,Cu,transition metals. Fabrication the solid oxide fuel cell (SOFC) nanoelectrode and exploration the relationship between morphology fabrication, oxygen deficiency type and cathode performance can reveals the laws between the synthesis process, microstructure and the material properties.Through studying the cathode reaction mechanism, we can provide the theory basis for the design and development of new electrode materials.

固体氧化物燃料电池的电极微观结构与组分影响了三相界面处（TPB）的电化学催化反应速率，进而决定了电池的电化学性能。项目主要采用微乳液技术构筑类钙钛矿结构A2BO4型纳米结构阴极材料，研究电极的不同微观形貌（纳米线、纳米管、纳米颗粒等）对其中低温电化学性能的影响，并考察电极上氧还原反应机理。通过控制和调节阴极材料的显微结构，改善电极材料的氧输运及催化性能，延伸纳米电极材料的三相界面活性反应区域。拟选择离子-电子混合电导率较高的镍系和铜系Ln2-xAxMO4氧化物为阴极材料。其中，Ln是稀土元素La,Pr,Nd等，A是碱土金属Sr，Ca，Ba；过渡族金属元素Ni或Cu。通过构筑形貌可控的固体氧化物燃料电池纳米电极，研究材料的显微结构与氧缺陷类型对材料性能的影响，阐明阴极材料的合成工艺-显微结构-材料性能之间的相关机制，研究阴极反应机理，为新型电极材料的开发提供理论依据。

项目主要采用微乳液和甘氨酸－硝酸盐技术制备类钙钛矿结构A2BO4型纳米结构阴极材料，研究电极的不同微观形貌（纳米纤维和纳米颗粒等）对其电催化性能的影响，并考察电极上氧还原反应机理。通过控制和调节电极的显微结构，改善材料的氧扩散及催化性能。项目选择Ni系和Cu系Ln2-xAxMO4氧化物为阴极材料。其中，Ln是稀土元素La,Pr,Nd等，A是碱土金属Sr，Ca，Ba；过渡族金属元素Ni或Cu。构筑形貌可控的纳米电极，研究材料的显微结构与氧缺陷类型对材料性能的影响，揭示电极的合成工艺-显微结构-材料性能之间的关联机制，研究阴极氧反应动力学过程，为新型电极材料的开发提供理论依据。