Assessment of thermochemically stable apatite La10(SiO4)6O3 as electrolyte for solid oxide fuel cells
Source abstract
Abstract
Abstract Apatite-type lanthanum silicate with a formula of La 10 (SiO 4 ) 6 O 3 is a potential candidate electrolyte for SOFC system because of its high ionic conductivity and low activation energy. Pure La 10 (SiO 4 ) 6 O 3 powder was prepared by solid state reaction and using a suitable thermal pretreatment (1000 °C/5 h) of the as-purchased La 2 O 3 powder. Materials characterization, thermal behaviors, and electrical properties of La 10 (SiO 4 ) 6 O 3 samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and two-point probe DC conductivity. A pure La 10 (SiO 4 ) 6 O 3 pellet was prepared at the sintering process of 1600 °C and 2.5 h with a high relative sintered density of 96.91%. The existence of secondary phases in La 10 (SiO 4 ) 6 O 3 pellet resulted in a lower conductivity than that of pure La 10 (SiO 4 ) 6 O 3 pellet. Eight-hour reduction-resistant stability tests under reducing atmosphere at the elevated temperature of pure La 10 (SiO 4 ) 6 O 3 prepared in this study shows a good thermochemical stability as compared to the well-developed 8 mol% Y 2 O 3 stabilized ZrO 2 (8YSZ).
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Electronic and Structural Properties of Oxides · Nuclear materials and radiation effects
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (30)
Show source-provided references
1. Transport properties of solid oxide electrolyte ceramics: a brief review10.1016/j.ssi.2004.06.015 ↗
2. High-performance ultrathin solid oxide fuel cells for low temperature operation10.1149/1.2372592 ↗
3. Gadolinia-doped ceria films deposited by RF reactive magnetron sputtering10.1016/j.ssi.2009.08.016 ↗
4. Pure and doped CeO2 thin films prepared by MOCVD process10.1016/S0040-6090(97)01215-7 ↗
5. Synthesis and properties of homogeneous Nb-doped bismuth oxide10.1111/j.1551-2916.2010.03836.x ↗
6. Oxide ionic conductivities of apatite-type lanthanum silicates and germanates and their possibilities as an electrolyte of lower temperature operating SOFC10.1016/j.ceramint.2009.10.022 ↗
7. Appraisal of Ce1−yGdyO2−y/2 electrolytes for IT-SOFC operation at 500°C10.1016/S0167-2738(99)00319-7 ↗
8. Microstructure and oxide ion conductivity in a dense La9.33(SiO4)6O2 oxy-apatite10.1111/j.1551-2916.2009.03032.x ↗
9. Diffusion path of oxide ions in an apatite-type oonic conductor La9.69(Si5.70Mg0.30)O26.2410.1021/cm7035234 ↗
10. Ionic conductivity and fuel cell properties of apatite-type lanthanum silicates doped with Mg and containing excess oxide ions10.1016/j.ssi.2008.07.022 ↗
11. Ionic conductivity of lanthanoid silicates, Ln10(SiO4)6O3 (Ln=La, Nd, Sm, Gd, Dy, Y, Ho, Er and Yb)10.1039/jm9950501801 ↗
12. Electrical properties of new type high oxide ionic conductor RE10Si6O27 (RE=La, Pr, Nd, Sm, Gd, Dy)10.1016/S0955-2219(98)00032-6 ↗
13. Synthesis of lanthanum silicate oxyapatite materials as a solid oxide fuel cell electrolyte10.1016/j.jeurceramsoc.2008.03.045 ↗
14. Chemical stability of La10Si6O27 and its application to electrolytes for solid oxide fuel cells10.1016/j.ssi.2008.02.030 ↗
15. New chemical route based on sol–gel process for the synthesis of oxyapatite La9.33Si6O2610.1016/j.ceramint.2005.03.001 ↗
16. Fabrication of an anode-supported gadolinium-doped ceria solid oxide fuel cell and its operation at 550°C10.1111/j.1551-2916.2005.00251.x ↗
17. Materials for fuel-cell technologies10.1038/35104620 ↗
18. Methanol as a direct fuel in intermediate temperature (500–600°C) solid oxide fuel cells with copper based anodes10.1016/j.ces.2005.05.030 ↗
19. Oxide ion conductivity in Sr-doped La10Ge6O27 apatite oxide10.1016/S0167-2738(00)00386-6 ↗
20. Effective ionic radii in oxides and fluorides10.1107/S0567740869003220 ↗
21. Synthesis and structural characterisation of the apatite-type phases La10−xSi6O26+z doped with Ga10.1016/j.ssi.2003.12.014 ↗
22. Doping strategies to optimise the oxide ion conductivity in apatite-type ionic conductors10.1039/b401273a ↗
23. Colloidal processing and characterization of aluminum-doped lanthanum oxyapatite, La10AlSi5O26.510.1111/j.1551-2916.2010.04074.x ↗
24. Formation of high oxide ion conductive phases in the sintered oxides of the system Bi2O3–Ln2O3 (Ln=La–Yb)10.1016/0022-4596(81)90328-5 ↗
25. Structural stability and conductivity of phase-stabilized cubic bismuth oxides10.1111/j.1151-2916.1999.tb02202.x ↗
26. Assessment of structurally stable cubic Bi12TiO20 as intermediate temperature solid oxide fuels electrolyte10.1016/j.jeurceramsoc.2011.04.039 ↗
27. Physical, chemical and electrochemical properties of pure and doped ceria10.1016/S0167-2738(99)00318-5 ↗
28. Thermodynamic and kinetic considerations for Bi2O3-based electrolytes10.1016/0167-2738(92)90106-Y ↗
29. A comparison of electrical properties of sputter-deposited electrolyte coatings dedicated to intermediate temperature solid oxide fuel cells10.1016/j.surfcoat.2006.01.061 ↗
30. Reactive co-sputter deposition of YSZ coatings using plasma emission monitoring10.1016/j.surfcoat.2011.02.024 ↗