无机材料学报 ›› 2024, Vol. 39 ›› Issue (3): 337-344.DOI: 10.15541/jim20230428 CSTR: 32189.14.10.15541/jim20230428

所属专题: 【能源环境】燃料电池(202409)

• 研究快报 • 上一篇    

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

陈正鹏1(), 金芳军2,3(), 李明飞1, 董江波1, 许仁辞1, 徐韩昭4, 熊凯5, 饶睦敏1, 陈创庭1, 李晓伟2, 凌意瀚2()   

  1. 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
    3.长春理工大学, 长春 130022
    4.广东省能源集团有限公司, 广州510000
    5.广东惠州天然气发电有限公司, 惠州 516000

Double Perovskite Sr2CoFeO5+δ: Preparation and Performance as Cathode Material for Intermediate-temperature Solid Oxide Fuel Cells

CHEN Zhengpeng1(), JIN Fangjun2,3(), LI Mingfei1, DONG Jiangbo1, XU Renci1, XU Hanzhao4, XIONG Kai5, RAO Muming1, CHEN Chuangting1, LI Xiaowei2, LING Yihan2()   

  1. 1. Guangdong Energy Group Science and Technology Research Institute Co., Ltd, Guangzhou 510000, China
    2. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China
    3. School of Physics, Changchun University of Science and Technology, Changchun 130022, China
    4. Guangdong Energy Group Co., Ltd., Guangzhou 510000, China
    5. Guangdong Huizhou LNG Power Co., Ltd., Huizhou 516000, China
  • Received:2023-09-20 Revised:2023-11-16 Published:2024-03-20 Online:2023-11-28
  • Contact: LING Yihan, professor. E-mail: lyhyy@cumt.edu.cn;
    JIN Fangjun, associate professor. E-mail: jinfj@cumt.edu.cn
  • About author:CHEN Zhengpeng (1991-), male, Master. E-mail: chenzhengpeng@geg.com.cn
  • Supported by:
    The Key-Area Research and Development Program of Guangdong Province(2022B0111130004);National Natural Science Foundation of China(52272257);Innovation Team of Jiangsu Province(JSSCTD202241)

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-xSDC(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。

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

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−xSDC (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−xSDC 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.

Key words: solid oxide fuel cell, double perovskite, cathode, Sr2CoFeO5+δ, composite electrode, electrochemical performance

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