双钙钛矿Sr2CoFeO5+δ阴极材料的制备及其中温固体氧化物燃料电池性能研究
Double Perovskite Sr2CoFeO5+δ:Preparation and Performance as Cathode Material for Intermediate-temperature Solid Oxide Fuel Cells
陈正鹏 1金芳军 2李明飞 1董江波 1许仁辞 1徐韩昭 3熊凯 4饶睦敏 1陈创庭 1李晓伟 5凌意瀚5
作者信息
- 1. 广东能源集团科技研究院有限公司,广州 510000
- 2. 中国矿业大学 材料科学与物理学院,徐州 221116;长春理工大学,长春 130022
- 3. 广东省能源集团有限公司,广州 510000
- 4. 广东惠州天然气发电有限公司,惠州 516000
- 5. 中国矿业大学 材料科学与物理学院,徐州 221116
- 折叠
摘要
随着操作温度降低,中温固体氧化物燃料电池(IT-SOFCs)需要更高催化活性的阴极材料来提升电池性能.为此,本研究采用溶胶-凝胶法合成了双钙钛矿 Sr2CoFeO5+δ(SCF)阴极材料,并探讨了 SCF 阴极与摩尔分数 20%Sm2O3 掺杂的CeO2(SDC)进行不同比例的复合对电极性能的影响,优化了电极的化学膨胀和面积比电阻(ASR),进而提升了SOFC单电池的电化学性能.结果表明,SCF作为SOFC阴极,经 950℃退火 10 h后与普通电解质具有良好的化学相容性;其中,SCF 与 SDC 按照质量比 1:1 复合的样品可以将纯 SCF 样品的平均热膨胀系数(TEC)从2.44×10-5 K-1 显著降到 15.4×10-5 K-1.此外,SCF-x SDC(x=20,30,40,50,x为SDC的质量分数)复合阴极的ASR在800℃下分别低至 0.036、0.034、0.028 和 0.092 Ω·cm2,SCF-40SDC在所有温度范围内都表现出更小的ASR.复合SDC可以优化SCF的三相界面且进一步提高SCF阴极的催化活性,以 0.3mm厚La0.9Sr0.1Ga0.8Mg0.2O3-δ(LSGM)为电解质的SCF-40SDC单电池(757 mW·cm-2)比SCF单电池(684 mW·cm-2)的最大功率密度更优,且超过目前大部分的文献报道.本研究制备的SCF-40SDC是一种性能优异的复合阴极材料,有望应用于中温固体氧化物燃料电池.
Abstract
Intermediate-temperature solid oxide fuel cells(IT-SOFCs),as the operating temperature decreases,require cathode materials with high catalytic activity.In this study,double perovskite Sr2CoFeO5+δ(SCF)was synthesized by Sol-Gel method,and effect of SCF cathode compounded with 20%(molar fraction)Sm2O3 doped CeO2(SDC)at different ratios on the electrode performance was elucidated.The SOFC single-cell performance was improved by optimized chemical expansion and area-specific resistance(ASR)from composite electrodes.Results show that,SCF cathode after annealing at 950℃for 10 h exhibits good chemical compatibility with common electrolytes.For the composite of SCF and SDC at a mass ratio of 1:1,the average thermal expansion coefficient(TEC)can be significantly reduced from 2.44×10-5 K-1 of pure SCF to 1.54×10-5 K-1.ASR of SCF-x SDC(x=20,30,40,50,x:mass percentage)composite cathodes are as low as 0.036,0.034,0.028 and 0.092 Ω·cm2 at 800℃,respectively.The SCF-40SDC composite cathode displays the lowest ASR value among SCF-x SDC in the whole temperature range.Based on the 0.3 mm-thick La0.9Sr0.1Ga0.8Mg0.2O3-δ(LSGM)electrolyte,the maximum power density of SOFC using SCF-40SDC(757 mW·cm-2)as a cathode is higher than that of pure SCF(684 mW·cm-2).These results demonstrate that the SCF-40SDC composite cathode is a promising candidate for application in IT-SOFCs.
关键词
固体氧化物燃料电池/双钙钛矿/阴极/Sr2CoFeO5+δ/复合电极/电化学性能Key words
solid oxide fuel cell/double perovskite/cathode/Sr2CoFeO5+δ/composite electrode/electrochemical performance引用本文复制引用
基金项目
Key-Area Research and Development Program of Guangdong Province(2022B0111130004)
国家自然科学基金(52272257)
Innovation Team of Jiangsu Province(JSSCTD202241)
出版年
2024
国家科技期刊平台
NSTL
万方数据