Comparative investigation of composition, microstructure and property influences on electrocatalysis of two representative cathodes: BaCo0.4Fe0.4Zr0.1Y0.1O3-δ versus Ba0.5Sr0.5Co0.8Fe0.2O3-δ

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2024-10-24 DOI:10.1016/j.jelechem.2024.118735

Tonghuan Zhang , Haolong Chen , Chengzhu Xiao , Peng Qiu , Huiying Qi , Baofeng Tu

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Abstract

BaCo_0.4Fe_0.4Zr_0.1Y_0.1O_3-δ (BCFZY) and Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF) perovskites are two representative high-performance cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Here, symmetric cell tests demonstrate that polarization resistance values of BCFZY cathode are only 0.21–0.29 times those of BSCF cathode at 740–660 °C, and 0.21–0.26 times those of BSCF cathode at the oxygen partial pressures of 1.00–0.10 atm. Distribution of relaxation times (DRT) is applied to detect individual electrode processes overlapped in impedance spectra, which finds that the dominant processes of oxygen dissociation, subsequent species transfer and reduction on BCFZY cathode are superior to those of BSCF cathode. By temperature-programmed desorption of oxygen (O₂-TPD), thermal expansion coefficient (TEC) measurements, scanning electron micrograph (SEM) and energy dispersive spectra measurements, the strong oxygen combination ability with higher activation energy of oxygen desorption (E_d = 84 kJ mol^-1), peculiar surface state with evident nano-particle structure, more matchable TEC (19.0 × 10^-6 K⁻¹) and excellent interfacial connection with the electrolyte are observed on BCFZY cathode to account for its distinctive catalysis, as compared to BSCF cathode (E_d = 68 kJ mol^-1, TEC = 24.2 × 10^-6 K⁻¹).

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比较研究两种代表性阴极的组成、微观结构和性质对电催化的影响：BaCo0.4Fe0.4Zr0.1Y0.1O3-δ 与 Ba0.5Sr0.5Co0.8Fe0.2O3-δ 的对比研究

BaCo0.4Fe0.4Zr0.1Y0.1O3-δ（BCFZY）和Ba0.5Sr0.5Co0.8Fe0.2O3-δ（BSCF）包晶是中温固体氧化物燃料电池（IT-SOFC）中两种具有代表性的高性能阴极材料。这里的对称电池测试表明，在 740-660 °C 温度下，BCFZY 阴极的极化电阻值仅为 BSCF 阴极的 0.21-0.29 倍；在氧分压为 1.00-0.10 atm 时，BCFZY 阴极的极化电阻值为 BSCF 阴极的 0.21-0.26 倍。应用弛豫时间分布（DRT）检测阻抗谱中重叠的单个电极过程，发现 BCFZY 阴极的氧解离、后续物种转移和还原等主导过程优于 BSCF 阴极。通过氧的温度编程解吸（O2-TPD）、热膨胀系数（TEC）测量、扫描电子显微镜（SEM）和能量色散光谱测量，BCFZY 阴极具有较高的氧解吸活化能（Ed = 84 kJ mol-1）和较强的氧结合能力，表面状态奇特，具有明显的纳米颗粒结构，TEC（19.0 × 10-6 K-1）以及与电解质之间良好的界面连接，这就是 BCFZY 阴极与 BSCF 阴极（Ed = 68 kJ mol-1，TEC = 24.2 × 10-6 K-1）相比具有独特催化作用的原因。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.