A high entropy stabilized perovskite oxide La0.2Pr0.2Sm0.2Gd0.2Sr0.2Co0.8Fe0.2O3−δ as a promising air electrode for reversible solid oxide cells

Q3 Energy 燃料化学学报 Pub Date : 2025-02-01 Epub Date: 2025-01-31 DOI:10.1016/S1872-5813(24)60486-X

Ruoyu LI , Xiaoyu LI , Jinke ZHANG , Yuan GAO , Yihan LING

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Abstract

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_0.2Pr_0.2Gd_0.2Sm_0.2Sr_0.2Co_0.8Fe_0.2O_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 (R_p) of the HE-LSCF electrode is only 0.25 Ω·cm² at 800 °C in an air atmosphere. Notably, at an electrolytic voltage of 2 V and a temperature of 800 °C, the current density reaches up to 1.68 A/cm². 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.

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一种高熵稳定的钙钛矿氧化物la0.2 pr0.2 sm0.2 gd0.2 sr0.2 co0.8 fe0.3 2o3−δ是一种很有前途的可逆固体氧化物电池空气电极

可逆固体氧化物电池（RSOC）是一种新型的能量转换装置，在电网调峰方面有着重要的应用。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。本文提出了一种新型的高熵钙钛矿氧化物La0.2Pr0.2Gd0.2Sm0.2Sr0.2Co0.8Fe0.2O3−δ (HE-LSCF)，并对其作为RSOC中的空气电极进行了研究。研究了HE-LSCF作为空气电极在燃料电池和电解两种模式下的电化学行为。在800℃空气环境下，HE-LSCF电极的极化阻抗（Rp）仅为0.25 Ω·cm2。在电解电压为2 V、温度为800℃时，电流密度可达1.68 a /cm2。HE-LSCF空气电极具有优异的可逆性和稳定性，可逆运行100 h后电化学性能仍保持稳定。由于这些优点，HE-LSCF被证明是RSOC的优良空气电极。

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.