基于La0.6Sr0.4CoO3-δ原位成相的中温固体氧化物燃料电池梯度阴极制备与表征

doi:10.3724/SP.J.1077.2014.13458

无机材料学报 ›› 2014, Vol. 29 ›› Issue (6): 621-626.DOI: 10.3724/SP.J.1077.2014.13458 CSTR: 32189.14.SP.J.1077.2014.13458

基于La0.6Sr0.4CoO3-δ原位成相的中温固体氧化物燃料电池梯度阴极制备与表征

郭秘兰, 屠恒勇, 李斯琳, 余晴春

(上海交通大学机械与动力工程学院, 燃料电池研究所, 上海 200240)

收稿日期:2013-09-09 修回日期:2013-10-19 出版日期:2014-06-20 网络出版日期:2014-05-27
作者简介:郭秘兰(1989-), 女, 硕士研究生. E-mail:relay@sjtu.edu.cn
基金资助:
国家自然科学基金(51072114);国家重点基础研究发展计划(973计划)(2012CB215400);National Natural Science Foundation of China (51072114);National Basic Research Program of China (973 Program) (2012CB215400)

Fabrication and Characterization of Functionally Graded Cathodes Based on in-situ Formed La_0.6Sr_0.4CoO_3-_δ for Intermediate Temperature SOFCs

GUO Mi-Lan, TU Heng-Yong, LI Si-Lin, YU Qing-Chun

(Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

Received:2013-09-09 Revised:2013-10-19 Published:2014-06-20 Online:2014-05-27
About author:GUO Mi-Lan. E-mail:relay@sjtu.edu.cn

摘要/Abstract

摘要：

采用溶胶-凝胶法制备出匀质、比表面积高的La_0.6Sr_0.4CoO_3-δ(LSC)阴极前驱体粉体以及其与Ce_0.8Gd_0.2O_2-_δ (CGO)的复合阴极粉体, 并通过TGA、XRD和BET等手段对粉体进行表征; 结果表明: LSC阴极前驱体经在高温氩气中煅烧和在空气中850℃退火2 h后能够完成成相, 这相应于功能梯度阴极的制备和SOFC电池堆工作前的退火条件, LSC/CGO和LSC分别沉积在NiO/YSZ阳极支撑的SOFC半电池CGO阴极阻挡层上, 功能梯度阴极在氩气中分别在900、950、1000℃温度下进行烧结, SEM和EDX分析发现功能梯度阴极与CGO阻挡层结合良好, 但SrZrO₂可在YSZ-CGO界面层中形成。LSC原位成相后的单电池性能测试表明, 输出性能随着烧结温度的降低而提高, 相比而言900℃为最佳烧结温度。

关键词: 固体氧化物燃料电池, 梯度阴极, LSC, 原位形成

Abstract:

Precursor powders of La_0.6Sr_0.4CoO_3-δ (LSC) and composite powders of LSC precursor and Ce_0.8Gd_0.2O_2-_δ (CGO) were prepared by Sol-Gel process. The precursor powders of LSC were characterized by TGA, XRD, BET and exhibited homogeneity and high specific surface area. XRD analysis indicated that single phase of LSC can be formed after calcination at high temperature in Ar and annealing at 850℃ for 2 h in air, which corresponds to the fabrication and annealing condition of functionally graded cathode before SOFC stack operation. Functionally graded cathode of LSC/CGO precursor and LSC precursor were sintered at 900--1000℃ in Ar, which were deposited on NiO/YSZ anode supported half cell with YSZ as electrolyte layer and CGO as barrier layer. Microstructural analysis by SEM and EDX indicated that graded cathode contacted well with CGO layer. It was found that SrZrO₃ was formed at the YSZ-CGO boundary. The test of single SOFC cells with in-situ formed LSC showed that cell performance was improved with decrease of the sintering temperature. In comparison, the best cell performance was achieved at the sintering temperature 900℃.

Key words: solid oxide fuel cell, gradient cathode, LSC, in-situ formation

中图分类号:

TQ174

郭秘兰, 屠恒勇, 李斯琳, 余晴春. 基于La0.6Sr0.4CoO3-δ原位成相的中温固体氧化物燃料电池梯度阴极制备与表征[J]. 无机材料学报, 2014, 29(6): 621-626.

GUO Mi-Lan, TU Heng-Yong, LI Si-Lin, YU Qing-Chun. Fabrication and Characterization of Functionally Graded Cathodes Based on in-situ Formed La_0.6Sr_0.4CoO_3-_δ for Intermediate Temperature SOFCs[J]. Journal of Inorganic Materials, 2014, 29(6): 621-626.

图/表 8

图1 La0.6Sr0.4CoO3-δ前驱体的热重曲线

Fig. 1 TG curve of La0.6Sr0.4CoO3-δ precursors

图2 不同制备阶段LSC粉体的XRD图谱

Fig. 2 XRD patterns of LSC after 900℃ (a), 950℃ (b) and 1000℃ (c) heat treatments

图 3 氩气气氛中在不同温度下梯度阴极烧结后的单电池在800℃的I-V-P曲线

Fig. 3 I-V-P curves of single cells at 800℃ with graded cathodes sintered at different temperatures in Ar

图 4 不同温度下单电池的I-V-P曲线

Fig. 4 I-V-P curves of single cell at different temperatures

图 5 不同温度下SOFC的交流阻抗图

Fig. 5 Electrochemical impedance spectra of SOFC measured at different temperatures

图6 单电池性能测试后断面(a)和阴极表面(b)的SEM照片(烧结温度为900℃)

Fig. 6 SEM images of cross-section of the single cell (a) and surface of cathode (b) (sintering temperature: 900℃)

图7 YSZ-CGO界面层中EDX分析点

Fig. 7 Locations in YSZ-CGO interface layer for EDX analysis

表 1 点“2”处的元素

Table 1 Elements at location “2”

Element	wt%	at%
Sr	0.56	0.91
Zr	1.88	2.91
Ce	79.42	79.92
Gd	18.14	16.26

参考文献 14

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基于La0.6Sr0.4CoO3-δ原位成相的中温固体氧化物燃料电池梯度阴极制备与表征

Fabrication and Characterization of Functionally Graded Cathodes Based on in-situ Formed La_0.6Sr_0.4CoO_3-_δ for Intermediate Temperature SOFCs

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