基于Y_(0.08)Zr_(0.92)O_(2-δ)/Er_(0.4)Bi_(1.6)O_(3)复合电解质的Ca_(3)Co_(4)O_(9+δ)氧电极电化学性能  

Electrochemical performance of Ca_(3)Co_(4)O_(9+δ) oxygen electrode based on Y_(0.08)Zr_(0.92)O_(2-δ)/Er_(0.4)Bi_(1.6)O_(3) composite electrolyte

作　　者：丁利利 张旭[1] 吴学英 李媛[1] 田彦婷[1] DING Lili;ZHANG Xu;WU Xueying;LI Yuan;TIAN Yanting(School of Optoelectronic Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学物理学院,太原030024

出　　处：《复合材料学报》2023年第8期4568-4576,共9页Acta Materiae Compositae Sinica

基　　金：山西省应用基础研究计划项目(20210302123111,20210302123151)。

摘　　要：可逆固体氧化物电池(RSOCs)是一种清洁高效的能量转换和电化学存储装置,由于目前使用的钙钛矿氧电极存在Sr偏析现象,对氧电极的耐久性提出了新的要求。采用溶液浸渍法在多孔Y_(0.08)Zr_(0.92)O_(2-δ) (YSZ)骨架上制备了YSZ/Er_(0.4)Bi_(1.6)O_(3) (ESB)复合电解质和Ca_(3)Co_(4)O_(9+δ) (CCO)氧电极,800℃时的极化电阻为0.45Ω·cm^(2)。氧电极在100 h的阴、阳极交替极化过程中表现出良好的稳定性,阳极和阴极极化对电极性能具有相反的影响机制,电解模式下氧电极性能的损耗可以通过电池模式得以恢复。Ni-YSZ/YSZ/ESB/CCO单电池在800℃时的最大输出功率为722 mW·cm^(-2),电解电压为1.5 V时的电解电流密度为-1 204 mA·cm^(-2),对应的产氢率为503.3 mL·cm^(-2)·h^(-1),实现了较高的能量转化。Reversible solid oxide cell(RSOC) is a clean and efficient electrochemical conversion and storage devices.Due to the Sr segregation in the now available perovskite oxygen electrodes,new requirements are put forward for the durability of oxygen electrodes.Y_(0.08)Zr_(0.92)O_(2-δ)/Er_(0.4)Bi_(1.6)O_(3)(YSZ/ESB) composite electrolyte and Ca_(3)Co_(4)O_(9+δ)(CCO) oxygen electrode were prepared by solution impregnation method in this paper.The polarization resistance of CCO oxygen electrode at 800°C was 0.45 Ω·cm~2.The oxygen electrode showed superior durability in the process of alternating anodic and cathodic polarization for 100 h.Anodic and cathodic polarization displayed opposite influence mechanisms on the electrode performance.The degradation induced in the electrolysis mode can be eliminated by reversibly cycling between electrolysis and fuel-cell modes.The Ni-YSZ/YSZ/ESB/CCO single cell obtained a maximum power density of 722 mW·cm^(-2) at 800℃.The electrolysis current density at 1.5 V was1 204 mA·cm^(-2),which corresponded to the hydrogen production rate of 503.3 mL·cm^(-2)·h^(-1).Results showed that CCO with good reversible polarization performance and long-term stability achieved a high energy conversion rate.

关 键 词：可逆固体氧化物电池 固体氧化物燃料电池 固体氧化物电解池 Ca_(3)Co_(4)O_(9+δ)氧电极 极化稳定性 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM911.4[电气工程—电力电子与电力传动] TB331