中温固体氧化物燃料电池的高熵双钙钛矿阴极材料:兼容性与活性研究  

Enhanced Compatibility and Activity of High-entropy Double Perovskite Cathode Material for IT-SOFC

作　　者：郭天民 董江波 陈正鹏 饶睦敏 李明飞 李田[1] 凌意瀚 GUO Tianmin;DONG Jiangbo;CHEN Zhengpeng;RAO Mumin;LI Mingfei;LI Tian;LING Yihan(School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China;Guangdong Energy Group Science and Technology Research Institute Co.,Ltd.,Guangzhou 510000,China)

机构地区：[1]中国矿业大学材料科学与物理学院,徐州221116 [2]广东能源集团科技研究院有限公司,广州510000

出　　处：《无机材料学报》2023年第6期693-700,共8页Journal of Inorganic Materials

基　　金：National Key R&D Program of China(2021YFB4001502);National Natural Science Foundation of China(52272257,52104229)。

摘　　要：中温固体氧化物燃料电池(IT-SOFC)有助于国家的碳中和战略,但其阴极材料难以兼顾热兼容性和催化活性。为此,基于多元素耦合的高熵策略,本研究合成了高熵阴极材料GdBa(Fe_(0.2)Mn_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2))_(2)O_(5+δ)(HE-GBO),具有双过氧化物结构,与Gd_(0.1)Ce_(0.9)O_(2-δ)(GDC)有良好的化学兼容性,协调了与催化活性之间的平衡性。采用HE-GBO阴极的对称电池在800℃下的极化电阻(Rp)为1.68Ω·cm^(2),而HE-GBO-GDC(质量比7:3)复合阴极的Rp因引入GDC而显著降低(800℃下Rp为0.23Ω·cm^(2))。采用HE-GBO和HE-GBO-GDC阴极组装树枝状微通道阳极支撑单电池,在800℃的最大功率密度分别达到972.12和1057.06 mW/cm^(2),使用高熵阴极可以进一步提高电池性能。这些结果表明多尺度优化有助于开发高性能的IT-SOFC阴极材料。Intermediate-temperature solid oxide fuel cell(IT-SOFC)is promising for carbon neutrality,but its cathode is limited by the contradiction between thermal compatibility and catalytic activity.Herein,we propose a high-entropy double perovskite cathode material,GdBa(Fe_(0.2)Mn_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2))_(2)O_(5+δ)(HE-GBO)with improved compatibility and activity,in view of the high-entropy strategy by multi-elemental coupling,which possesses double perovskite structure and excellent chemical compatibility with state-of-the-art Gd_(0.1)Ce_(0.9)O_(2-δ)(GDC).The polarization resistance(Rp)of the symmetrical cells with HE-GBO cathode is 1.68Ω·cm^(2)at 800℃,and the corresponding Rp of HE-GBO-GDC(mass ratio 7:3)composite cathode can be greatly reduced(0.23Ω·cm^(2)at 800℃)by introducing GDC.Dendritic microchannels anode-supported single cells with HE-GBO and HE-GBO-GDC cathodes realize maximum power densities of 972.12 and 1057.06 mW/cm^(2)at 800℃,respectively,indicating that cell performance can be enhanced by high-entropy cathodes.The results demonstrate that high-entropy double perovskite cathode material HE-GBO has a high potantial to solve the conflict problem of thermal compatibility and catalytic activity in IT-SOFCs.

关 键 词：高熵阴极 固体氧化物燃料电池 热相容性 树枝状微通道 

分 类 号：O61[理学—无机化学]