LaAlO<sub>3</sub>基电解质与阳极材料的化学相容性及电化学性能

引用本文: 覃国恒, 黄晓巍, 胡智. LaAlO₃基电解质与阳极材料的化学相容性及电化学性能[J]. 物理化学学报, 2013, 29(02): 311-318. doi: 10.3866/PKU.WHXB201212062 shu

Citation: QIN Guo-Heng, HUANG Xiao-Wei, HU Zhi. Chemical Compatibility and Electrochemical Performance between LaAlO₃-Based Electrolyte and Selected Anode Materials[J]. Acta Physico-Chimica Sinica, 2013, 29(02): 311-318. doi: 10.3866/PKU.WHXB201212062 shu

LaAlO₃基电解质与阳极材料的化学相容性及电化学性能

基金项目:
福建省自然科学基金(2008J0146)资助项目 (2008J0146)

摘要:

采用甘氨酸-硝酸盐法(GNP)合成La_0.90Sr_0.10Al_0.97Mg_0.03O_3-δ (LSAM)粉体, 成型后经1500 °C、5 h 烧结的样品, 900 °C时其电导率为1.11×10^-2 S·cm^-1. 利用X射线衍射(XRD)、扫描电镜/X 射线能谱分析(SEM/EDX)和交流阻抗技术等表征手段研究NiO-Ce_0.9Gd_0.1O_1.95 (Ni-GDC)、Sr_0.88Y_0.08TiO₃ (SYT)和La_0.75Sr_0.25Cr_0.5Mn_0.5O₃(LSCM)三种阳极材料与LSAM电解质的化学相容性. 结果表明, SYT 和LSCM与LSAM的化学相容性欠佳,SYT中的Sr²⁺和Ti⁴⁺向LSAM晶格的扩散明显, LSCM中的Mn³⁺和Cr³⁺向LSAM晶格的扩散显著; 而Ni-GDC与LSAM具有良好的化学相容性, 在1300 °C下两材料间阳离子的相互扩散作用极小. 800 °C时Ni-GDC的比表面极化电阻(RASP)值为5.12 Ω·cm². LSAM 电解质(厚度为550 μm)支撑的Ni-GDC/GDC/LSAM/GDC/LSF(La_0.75Sr_0.25FeO₃)单电池, 在800 °C时电池的开路电压为0.925 V, 最大功率密度为19.5 mW·cm^-2.

关键词:

English

Chemical Compatibility and Electrochemical Performance between LaAlO₃-Based Electrolyte and Selected Anode Materials

1.
College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, P.R. China
Received Date: 17 September 2012
Available Online: 14 January 2013
Fund Project:
福建省自然科学基金(2008J0146)资助项目

Abstract:

Powders of La_0.90Sr_0.10Al_0.97Mg_0.03O_3-δ (LSAM) were synthesized by the glycine-nitrate process, and then sintered at 1500 °C for 5 h. Impedance spectroscopy at 900 °C in air revealed that the conductivity of LSAM was 1.11×10^-2 S·cm^-1. The chemical compatibility of LSAM with anode materials NiO-Ce_0.9Gd_0.1O_1.95 (Ni-GDC), Sr_0.88Y_0.08TiO₃ (SYT) and La_0.75Sr_0.25Cr_0.5Mn_0.5O₃ (LSCM) was characterized by X-ray diffraction, scanning electron microscopy with energy-dispersive X-ray spectroscopy and AC impedance spectroscopy. The results indicated that SYT and LSCM had poor chemical compatibility with LSAM because Sr²⁺, Ti⁴⁺, Mn³⁺, and Cr³⁺ diffused readily into the LSAM lattice. The interdiffusion of cations between LSAM and Ni- GDC at 1300 °C was limited, implying excellent chemical compatibility. The electrochemical performance of symmetrical cells of the anode materials was measured under hydrogen atmosphere. The area-specific polarization resistance of Ni-GDC was 5.12 Ω·cm² at 800 ° C. An open-circuit voltage of 0.925 V and a power density of 19.5 mW·cm^-2 were obtained at 800 °C for a 550 μm thick LSAM electrolyte-supported single cell (Ni-GDC/GDC/LSAM/GDC/La0.75Sr0.25FeO3).

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

LaAlO₃基电解质与阳极材料的化学相容性及电化学性能

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