LaAlO3基电解质与阳极材料的化学相容性及电化学性能

doi:10.3866/PKU.WHXB201212062

Abstract

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: LaAlO₃-based electrolyte, Chemical compatibility, Area-specific polarisation resistance, Solid oxide fuel cell

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

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

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