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Analysis of three-dimensional microstructure evolution of tested Ni-YSZ anodes by Nano-CT
- NUCLEAR TECHNIQUES Vol. 39, Issue 6, Article number: 060102(2016)
- 作者机构：
中国科学技术大学 国家同步辐射实验室 合肥 230029
- 作者简介：
- 基金信息：Supported by National Natural Science Foundation of China;Supported by National Natural Science Foundation of China;Supported by National Natural Science Foundation of China;National Natural Science Foundation of China;the Major State Basic Research Development Program of China (973 Program)
DOI：10.11889/j.0253-3219.2016.hjs.39.060102
CLC： O434.19Received：23 March 2016，
Revised：25 April 2016，
Published：10 June 2016
- 稿件说明：
移动端阅览
Pengfei GUO, Yong GUAN, Gang LIU, et al. Analysis of three-dimensional microstructure evolution of tested Ni-YSZ anodes by Nano-CT[J]. Nuclear techniques, 2016, 39(6): 060102
Pengfei GUO, Yong GUAN, Gang LIU, et al. Analysis of three-dimensional microstructure evolution of tested Ni-YSZ anodes by Nano-CT[J]. Nuclear techniques, 2016, 39(6): 060102 DOI： 10.11889/j.0253-3219.2016.hjs.39.060102.
摘要
固体氧化物燃料电池(Solid Oxide Fuel Cell
SOFC)阳极不仅提供了电化学反应的三相界面(Three-phase boundary
TPB)区域
而且在物质传输、扩散和燃料电池反应中不同物质之间的隔离起到积极作用。在运行期间
电极微结构发生变化。对SOFC阳极微结构演变的研究能够帮助我们理解长期运行的SOFC性能损失的原因。近年来不断发展的X射线纳米CT (Computed Tomography)技术使得可以无损地获得测试前后的阳极三维微结构。本文利用硬X射线纳米CT技术对Ni-YSZ复合阳极进行了三维重建
并采用自主开发的一些定量分析方法来获得阳极微结构的关键参数
如颗粒尺寸、每种相的体积分数和连通率等。发现在电池测试后
Ni颗粒尺寸增大
与之相对是由于Ni颗粒的聚集导致Ni相的连通性和三相界面长度明显下降。结果表明
在电池测试过程
Ni颗粒发生了团聚
电极微结构发生了改变
进而导致SOFC性能损失。阳极结构的数据表明
X射线纳米CT技术能够作为一个强力工具研究能源材料的微结构
为阳极结构优化提供重要参考数据。
Abstract
Background
2
Anode in solid oxide fuel cell (SOFC) provides three-phase boundary (TPB) regions for electrochemical reactions and plays an active role in mass transfer
gas diffusion and isolation between different substances.
Purpose
2
During operation
the microstructure of anode will be changed.Research on microstructural evolution of SOFC anode can help us understand performance degradation of SOFC after long time operation.
Methods
2
Recently
development of X-ray nano-CT (Computed Tomography) makes it possible to nondestructively obtain the three-dimensional (3D) microstructural change of anodes subjected to no test and test for 20 h.Some quantitative analysis methods developed in house are applied to obtain key parameters of microstructures.
Results
2
Based on the reconstructions of anode 3D microstructures
some parameters of microstructures are measured
such as particle size
volume fraction of each phase and connectivity for each phase.The average particle size of Ni increases after SOFC test
while the Ni-phase connectivity and TPB density of tested anode decrease
which is caused by the aggregation and growth of Ni particles.
Conclusion
2
The data of untested and tested anode microstructures shows that the agglomeration of Ni particles occurs and internal structure of anode has changed after SOFC test
which may be a main reason causing performance degradation of SOFC during long time operation.This shows that X-ray nano-CT is a powerful tool to study energy materials and provides important data for optimizing the microstructure of anode.
关键词
Keywords
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