基于纳米CT技术研究运行后Ni-YSZ阳极三维微结构变化

郭鹏飞; 关勇; 刘刚; 田扬超

doi:10.11889/j.0253-3219.2016.hjs.39.060102

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基于纳米CT技术研究运行后Ni-YSZ阳极三维微结构变化

同步辐射技术及应用 | 更新时间：2021-05-24

- 基于纳米CT技术研究运行后Ni-YSZ阳极三维微结构变化
- Analysis of three-dimensional microstructure evolution of tested Ni-YSZ anodes by Nano-CT
- 核技术 2016年39卷第6期文章编号：060102
- 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：
  
  [ "郭鹏飞,男,1992年出生,2013年毕业于中国科学技术大学,研究领域为X射线成像研究", "GUO Pengfei, male, born in 1992, graduated from University of Science and Technology of China in 2013, focusing on X-ray nano-CT" ]
  田杨超,E-mail:ychtian@ustc.edu.cn TIAN Yangchao,E-mail:ychtian@ustc.edu.cn
- 基金信息：
  
  国家自然科学基金(11205189);国家自然科学基金(11275204);国家自然科学基金(11475175);国家自然科学基金(11405175);国家重点基础研究发展计划(973计划)(2012CB825804)
- DOI：10.11889/j.0253-3219.2016.hjs.39.060102
  中图分类号： O434.19
- 收稿日期：2016-03-23，
  
  修回日期：2016-04-25，
  
  纸质出版日期：2016-06-10
- 稿件说明：
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郭鹏飞, 关勇, 刘刚, 等. 基于纳米CT技术研究运行后Ni-YSZ阳极三维微结构变化[J]. 核技术, 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
郭鹏飞, 关勇, 刘刚, 等. 基于纳米CT技术研究运行后Ni-YSZ阳极三维微结构变化[J]. 核技术, 2016,39(6):060102 DOI： 10.11889/j.0253-3219.2016.hjs.39.060102.

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

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

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

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

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

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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