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Synthesis and Electrical Properties of (La1-xSrx)2(Mo1-yMy)2O9-α(M=Al3+,Sc3+) and YSZ

Author: LiYaDong
Tutor: MaGuiLin
School: Suzhou University
Course: Inorganic Chemistry
Keywords: La2Mo2O9 YSZ Oxygen ion conductors Oxygen concentration cell Oxygen sensor
CLC: TM911.4
Type: Master's thesis
Year: 2010
Downloads: 59
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Abstract


Oxygen ions in the solid electrolyte because of its wide range of applications in solid oxide fuel cell (SOFC), oxygen sensors, temperature sensors, oxygen permeability film attracted much attention. 2000 Lacorre et al reported a novel oxygen ion conductors the molybdic acid lanthanum (La2Mo2O9), even without doping cheap metal cation, within its lattice also has a considerable number of the intrinsic oxygen vacancies, having a higher than under the same conditions stabilized ZrO2 oxygen ion conductivity. In this paper, the high temperature solid-phase synthesis of double-doped (La 1-x 2 the (Mo y the Sr x ) < / sub> Al y ) 2 O 9 (x = 0.05, y = 0,0.01,0.03,0.05; x = 0.025, y = 0,0.01,0.03) series of samples, XRD, SEM characterization. samples This series of samples for the solid electrolyte and porous platinum electrode AC impedance spectroscopy methods such as gas concentration cell each sample in 550 1000 ° C under different atmosphere conductive properties. Series of sample test results show that: the samples are single cubic phase La 2 Mo 2 O 9 structure; oxygen concentration cell electromotive force measured value and the theoretical value, the oxygen ion transport number is 1, showed that the sample at this temperature, in an oxygen atmosphere is a pure oxygen ion conductor; x = 0.025 sample conductivity superior conductive properties of the x = 0.05 sample; the series of samples , x = 0.025, y = 0.01 of the sample having the highest electrical conductivity, up to 0.067 S cm-1 1000 ° C when the electric conductivity. For the first time by the high temperature solid-phase synthesis of La 2 (Mo 1-z Sc) 2 O 9 ( z = 0,0.01,0.03,0.05,0.07) series of samples, samples of XRD, SEM characterization. This series of samples for the solid electrolyte and porous platinum electrode AC impedance spectroscopy, gas concentration cell research conductive characteristics of each sample in 450 850 ℃ under different atmosphere. The results show that: the samples are single cubic phase La 2 Mo 2 O 9 structure; measured value and the theoretical value of the oxygen concentration cell well, the oxygen ion transport number is 1, showed that the sample at this temperature in an oxygen atmosphere is a pure oxygen ion conductor; samples different conductive, low oxygen partial pressure in the atmosphere, at a higher oxygen partial pressure range (pO 2 = 10-13 1atm), regardless of the changes in conductivity and oxygen partial pressure, indicating that the oxygen partial pressure range sample is a pure oxygen ion conductor, which oxygen concentration cell measurement results coincide; (pO 2 = 10-14 10-20atm), conductivity increases with the partial pressure of oxygen in the lower range of oxygen partial pressure lower elevated, indicating that the oxygen partial pressure range of the sample was mixed conductor of oxygen ions and electrons generated in the sample of electronic conductivity High molybdenum is reduced to a Low molybdenum related; doping amount of oxygen ion conductivity of the sample have a significant impact: The decreases when the Sc3 doping z ≥ 0.05 can inhibit the phase transition; conductivity of the sample first increases with increasing doping amount z, z = 0.05, the highest conductivity, 850 ℃ when conductivity of 0.04 S · cm -1 . On the basis of the underlying nature of the study, also conducted a study of the application of solid electrolyte oxygen ions. Hydrothermal Synthesis of oxygen ion conductor YSZ (8% Y-. 2 O 3 · ZrO 2 ) as the electrolyte, producing a small portable oxygen sensor for measuring the content of oxygen in the cylinders in the high purity gas, such as Ar, This broadens the range of applications of the YSZ oxygen ion conductor, and as the the novel oxygen ion conductors La 2 Mo 2 O 9 applied to the oxygen sensor provides an important reference.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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