Strontium cerate-based high-temperature proton conductor material and preparation method and application thereof

A proton conductor and high temperature technology, applied in the field of high temperature proton conductors, can solve the problems of poor chemical stability of high temperature proton conductors

Active Publication Date: 2012-05-09
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention proposes to improve the two most representative SrCeO 3 Based high temperature proton conductor SrCe 0.9 Y 0.1 o 3-δ with SrCe 0.95 Yb 0.05 o 3-δ acidity of the material, thereby inhibiting its interaction with H 2 O or CO 2 The reaction to solve SrCeO 3 The problem of poor chemical stability of high-temperature proton conductors has not been reported by others so far

Method used

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  • Strontium cerate-based high-temperature proton conductor material and preparation method and application thereof
  • Strontium cerate-based high-temperature proton conductor material and preparation method and application thereof
  • Strontium cerate-based high-temperature proton conductor material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Using high-purity SrCO 3 , CeO 2 , SnO 2 and Y 2 o 3 powder (analytically pure), according to the chemical formula SrCe 0.9-x sn x Y 0.1 o 3-δ The stoichiometric ratio (x is Sn 4+ Doping amount, x=0, 0.1, 0.15, 0.2) carry out weighing batching; 2 The ball was wet milled for 10 hours, dried, passed through a 200-mesh sieve, and roasted for 10 hours at 1250°C in an air atmosphere; 2 Wet mill the ball for 10 hours, add 1% PVB as binder, mix evenly, dry, pass through a 200-mesh sieve, shape, and then press isostatically under 200 MPa to obtain a green body; finally, the green body is roasted at 600°C for 2 After debinding for 1 hour, it was sintered at 1450 °C for 10 hours to obtain SrCe 0.9-x sn x Y 0.1 o 3-δ Material.

[0043] figure 1 Is the different Sn prepared in this example 4+ doped SrCe 0.9-x sn x Y 0.1 o 3-δ (x=0, 0.1, 0.15, 0.2) XRD spectra of ceramics (corrected by doping high-purity Si to calculate lattice parameters). It can be seen that ...

Embodiment 2

[0047] Using high-purity SrCO 3 , CeO 2 , SnO 2 and Y 2 o 3 powder (analytically pure), according to the chemical formula SrCe 0.9-x sn x Y 0.1 o 3-δ The stoichiometric ratio (x is Sn 4+ Doping amount, x=0, 0.1, 0.15, 0.2) carry out weighing batching; 2 The ball was wet milled for 8 hours, dried, passed through a 200-mesh sieve, and roasted for 10 hours at 1300°C in an air atmosphere; 2 Wet mill the ball for 10 hours, add 1.5% PVB as binder, mix evenly, dry, pass through a 200-mesh sieve, shape, and then isostatically press under 250MPa pressure to obtain a green body; finally, the green body is roasted at 600°C for 2 After debonding for 1 hour, sintering at 1500°C for 10 hours yields SrCe 0.9-x sn x Y 0.1 o 3-δ Material.

[0048] Figure 5 Different Sn prepared for this example 4+ doped SrCe 0.9-x sn x Y 0.1 o 3-δ (x=0, 0.1, 0.15, 0.2) XRD spectra of ceramics before and after boiling in boiling water for 4 hours. It can be seen that the undoped Sn 4+ Aft...

Embodiment 3

[0053] Using high-purity SrCO 3 , CeO 2 , SnO 2 and Y 2 o 3 powder (analytically pure), according to the chemical formula SrCe 0.9-x sn x Y 0.1 o 3-δ The stoichiometric ratio (x is Sn 4+ Doping amount, x=0, 0.1, 0.15, 0.2) carry out weighing batching; 2 The ball was wet milled for 10 hours, dried, passed through a 200-mesh sieve, and calcined for 10 hours at 1200°C in an air atmosphere; 2 Ball wet grinding for 10 hours, adding 1% PVB as binder, mixing evenly, drying, passing through 200 mesh sieve, forming, and then isostatic pressing under 150MPa pressure to obtain green body; finally, the green body was roasted at 600°C for 2 After removing the binder for 1 hour, it was divided into six parts and sintered at 1250, 1300, 1350, 1400, 1450, and 1500 ° C for 10 hours to obtain SrCe at different sintering temperatures. 0.9-x sn x Y 0.1 o 3-δ Material.

[0054] Figure 6 Different Sn prepared for this embodiment 4+ doped SrCe 0.9-x sn x Y 0.1 o 3-δ (x=0, 0.1, 0...

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Abstract

The invention provides a Sn<4+>-doped and modified SrCeO3-based high-temperature proton conductor material and a preparation method and application thereof. The material has a chemical general formula, i.e., SrCe1-x-zSnxMzO3-6, wherein M is Y or Yb; x is more than 0 and less than or equal to 0.25; and y is more than or equal to 0.05 and less than or equal to 0.2. The chemical stability of the SrCeO3-based high-temperature proton conductor material to H2O and CO2 is enhanced by performing Sn<4+> doping and modifying, i.e., the SrCeO3-based high-temperature proton conductor material with higher chemical stability is prepared by adding an appropriate amount of oxide raw material powder containing an Sn element in the raw material powder synthesizing process of a ceramic system with a solid-phase reaction method. According to the invention, foundations are laid for application of the SrCeO3-based high-temperature proton conductor material on the aspects of hydrogen pumps, gas sensors, vapor electrolytic cells, fuel cells, gas separation membranes, membrane reactors for organic synthesis catalytic dehydrogenation and hydrogenation, and the like.

Description

technical field [0001] The invention relates to the field of high-temperature proton conductors, in particular to a method of improving SrCeO 3 A method for the chemical stability of a high-temperature proton conductor, particularly a SrCeO 3 Based high-temperature proton conductor material and its preparation method. Background technique [0002] From 1981 to 1988, Japanese H.Iwahara and others reported that the general formula was ABO 3 (A represents Ca, Sr, Ba, etc. +2 valent cations, B represents Ce, Zr, etc. +4 valent cations, O represents O 2- Anion) oxides, with +3 valent rare earth elements or In 3+ After the oxide doping of +3 valent cations, oxygen vacancies are generated, which can be expressed as AB 1-x m x o 3-δ (x represents the range in which doping elements form oxide solid solutions, x = 0.05 to 0.25, and δ represents the O in the unit cell of the composite oxide 2- number of vacancies), and has proton conductivity in high-temperature hydrogen-contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/50C04B35/622
Inventor 张敬超温兆银韩金铎刘宇吴相伟靳俊崔言明
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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