A high entropy stabilized perovskite oxide La_(0.2)Pr_(0.2)Sm_(0.2)Gd_(0.2)Sr_(0.2)Co_(0.8)Fe_(0.2)O_(3−δ)as a promising air electrode for reversible solid oxide cells  

一种高熵稳定的钙钛矿氧化物La_(0.2)Pr_(0.2)Sm_(0.2)Gd_(0.2)Sr_(0.2)Co_(0.8)Fe_(0.2)O_(3−δ)作为可逆固体氧化物电池的空气电极材料

作　　者：LI Ruoyu LI Xiaoyu ZHANG Jinke GAO Yuan LING Yihan 李若宇;李晓宇;张金柯;高源;凌意瀚(中国矿业大学材料与物理学院,江苏徐州221116;淮南师范学院计算机学院,安徽淮南232001)

机构地区：[1]School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China [2]School of Computer Science,Huainan Normal University,Huainan 232001,China

出　　处：《燃料化学学报(中英文)》2025年第2期282-290,共9页Journal of Fuel Chemistry and Technology

基　　金：supported by Fundamental Research Funds for the Central Universities(2023KYJD1008);the Science Research Projects of the Anhui Higher Education Institutions of China(2022AH051582).

摘　　要：Reversible solid oxide cell(RSOC)is a new energy conversion device with significant applications,especially for power grid peaking shaving.However,the reversible conversion process of power generation/energy storage poses challenges for the performance and stability of air electrodes.In this work,a novel high-entropy perovskite oxide La_(0.2)Pr_(0.2)Gd_(0.2)Sm_(0.2)Sr_(0.2)Co_(0.8)Fe_(0.2)O_(3−δ)(HE-LSCF)is proposed and investigated as an air electrode in RSOC.The electrochemical behavior of HE-LSCF was studied as an air electrode in both fuel cell and electrolysis modes.The polarization impedance(Rp)of the HE-LSCF electrode is only 0.25Ω·cm^(2) at 800℃ in an air atmosphere.Notably,at an electrolytic voltage of 2 V and a temperature of 800℃,the current density reaches up to 1.68 A/cm^(2).The HE-LSCF air electrode exhibited excellent reversibility and stability,and its electrochemical performance remains stable after 100 h of reversible operation.With these advantages,HE-LSCF is shown to be an excellent air electrode for RSOC.可逆固体氧化物电池(RSOC)是一种新型的能量转换装置,具有重要的应用价值,特别是在电网调峰方面。然而,发电/储能的可逆转换过程对空气电极的性能和稳定性提出了挑战。本工作提出了一种新型高熵氧化物La_(0.2)Pr_(0.2)Gd_(0.2)Sm_(0.2)Sr_(0.2)Co_(0.8)Fe_(0.2)O_(3−δ)(HE-LSCF),并研究了其作为RSOC中的空气电极在燃料电池和电解模式下的电化学行为。在800℃的空气环境中,HE-LSCF电极的极化阻抗(Rp)仅为0.25Ω·cm^(2)。在2 V的电解电压和800℃的温度下,电流密度高达1.68 A/cm^(2)。HE-LSCF空气电极具有出色的可逆性和稳定性,其电化学性能在可逆操作100 h后仍然保持稳定。HE-LSCF的这些优点表明它是一种用于RSOC的优秀空气电极。

关 键 词：reversible solid oxide cell high entropy stabilized perovskite air electrode electrochemical performance 

分 类 号：O646[理学—物理化学]