Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (02): 311-318.doi: 10.3866/PKU.WHXB201212062

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

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

QIN Guo-Heng, HUANG Xiao-Wei, HU Zhi   

  1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, P.R. China
  • Received:2012-09-17 Revised:2012-12-05 Published:2013-01-14
  • Supported by:

    The project was supported by the Natural Science Foundation of Fujian Province, China (2008J0146).

Abstract:

Powders of La0.90Sr0.10Al0.97Mg0.03O3-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-Ce0.9Gd0.1O1.95 (Ni-GDC), Sr0.88Y0.08TiO3 (SYT) and La0.75Sr0.25Cr0.5Mn0.5O3 (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

MSC2000: 

  • O646