Barium zirconate proton conductor with multi-phase structure and preparation method thereof

A proton conductor and phase structure technology is applied in the field of ceramic materials to achieve the effects of enhancing interfacial proton conduction, low cost and increasing proton migration speed

Inactive Publication Date: 2011-09-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Barium zirconate proton conductor with multi-phase structure and preparation method thereof
  • Barium zirconate proton conductor with multi-phase structure and preparation method thereof

Examples

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Embodiment 1

[0014] Take 1 mole of BaCO 3 , 1 mole of ZrO 2 , 0.13 mol Sc 2 o 3 , mixed with water for 4 hours by ball milling, dried, ground, sieved, and calcined at 1200 for 12 hours to obtain Sc 2 o 3 doped BaZrO 3 Matrix material. Then based on the base material, add 0.02 mole of ZnO, ball mill and mix for 4 hours, then dry, grind, and sieve, then base on the base material, add 0.05 mole of NaF, and grind for 1 hour to ensure the uniformity of the mixture. The mixture was put into a mold for dry pressing at a pressure of 50 MPa, and then subjected to isostatic pressing at 200 MPa; sintered at 1200 °C in an air atmosphere with a heating rate of 2 °C / min, kept for 10 hours, and then naturally cooled to room temperature to obtain Barium zirconate proton conductor material with good conductivity, the conductivity reaches 2.90×10 at 800°C -3 S / cm.

Embodiment 2

[0016] Take 1 mole of BaCO 3 , 1 mole of ZrO 2 , 0.30 mole Sc 2 o 3 The base material was prepared, and the base material was obtained by ball milling with water as the medium for 10 hours, drying, grinding, sieving, and calcining at 1400°C for 4 hours. Then add 0.10 mole of ZnO, ball mill and mix for 10 hours, then dry, grind and sieve, then add 0.50 mole of NaF (based on 1 mole of matrix material), and mill for 1 hour to ensure the uniformity of the mixture. The mixture was put into a mold for dry pressing at a pressure of 120 MPa, and then subjected to isostatic pressing at 350 MPa; sintered at 1500 °C in an air atmosphere, with a heating rate of 10 °C / min, kept for 2 hours, and then naturally cooled to room temperature to obtain Barium zirconate proton conductor material with good electrical conductivity.

Embodiment 3

[0018] Take 1 mole of BaCO 3 , 1 mole of ZrO 2 , 0.13 mol Sc 2 o 3 , using water as the medium for ball milling and mixing for 6 hours, drying, grinding, sieving, and calcining at 1400 for 6 hours to obtain the matrix material. Then add 0.02 moles of ZnO, ball mill and mix for 6 hours, then dry, grind and sieve, and then add 0.10 moles of CaF 2 (Based on 1 mole of base material), grind for 1 hour to ensure the homogeneity of the mixture. Put the mixture into a mold for dry pressing at a pressure of 120MPa, and then undergo isostatic pressing at 200MPa; sinter at 1350°C in an air atmosphere with a heating rate of 2°C / min, keep it warm for 4 hours, and then naturally cool to room temperature to obtain High conductivity barium zirconate proton conductor material, the conductivity reaches 1.94×10 at 800°C -3 S / cm.

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Abstract

The invention belongs to a barium zirconate proton conductor material with a multi-phase structure and a preparation method thereof. Burdening is conducted according to the following ratio: BaCO3:ZrO2:Sc2O3=1:1:0.05-0.30 mole, ball-milling and mixing are conducted by taking water as a medium, and then calcining is conducted to obtain a Sc2O3-doped BaZrO3 matrix material; ZnO of 1-10% mole is added, then CaF2, BaF2 or NaF of 5-50% mole is added by taking the matrix material as a benchmark after the ball-milling, mixing and sieving, and grinding mixture to be even; the mixture is put into a mould to be molded by dry pressing, and subjected to 200-350 MPa isostatic pressing; and the mixture is sintered in air atmosphere at 1200-1500 DEG C, and then naturally cooled to room temperature, thus obtaining the barium zirconate proton conductor material with the multi-phase structure. The invention provides a new idea for conducting multi-phase structure and doping modification on a barium zirconate proton conductor simultaneously, and solves the restriction of grain boundaries on material conductivity through microscopic structure design and control, with the material conductivity being expected to be above 10-2 S/cm, thus laying a foundation for the development of hydrogen and steam sensors, hydrogen pumps and concentration cell electrolyte materials.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a multiphase structure barium zirconate proton conductor material and a preparation method thereof. Background technique [0002] Perovskite-type proton conductors are a new class of conductor materials that can be widely used in electrolyte materials for proton ceramic fuel cells (PCFCs), hydrogen separation, hydrogen sensors, and hydrodehydrogenation reactions. Iwahara et al. reported the proton conductivity and mechanism of doped perovskite cerate and zirconate in 1981 [Iwahara H, Esaka T, Uchida H, et al. Proton conduction in sintered oxides and its application to steam electrolysis for hydrogen producti [0003] Compared with cerate proton conductors, although the proton conductivity of zirconate proton conductors is lower, its stability is very good. If it is modified by homogeneous doping and heterogeneous compounding at the same time, it can make it...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/622
Inventor 郭瑞松任建勋
Owner TIANJIN UNIV
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