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Multi-phase structure designed high-conductive electrical zirconate barium proton conductor and preparation method thereof

A high-conductivity, proton conductor technology, applied in conductors, conductive materials, conductive materials, etc., can solve the problems of good stability and poor stability, and achieve the improvement of grain boundary characteristics, proton conductivity and enhancement of interfacial proton conduction. Effect

Inactive Publication Date: 2007-09-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The proton conductivity of cerate is relatively high, but a fatal weakness of cerate is its poor stability
Although the proton conductivity of zirconate is low, its stability is good. If it is modified by multi-phase doping, its conductivity can be increased to an applicable 10 -2 ~10 -1 S / cm or more, its application prospects and significance are very significant
As perovskite proton conductors are getting more and more attention, it is imminent to overcome the problem of low conductivity of zirconates. This invention proposes the research of multi-phase structure design of high conductivity zirconate proton conductors. Through microstructure design and control, it solves the problem of grain boundaries affecting material conductivity. rate constraints, to achieve performance leaps, so far no other research reports

Method used

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  • Multi-phase structure designed high-conductive electrical zirconate barium proton conductor and preparation method thereof
  • Multi-phase structure designed high-conductive electrical zirconate barium proton conductor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Take 1 mole of BaCO 3 , 0.95 mol ZrO 2 , 0.05 mole Y 2 o 3, using water as the medium for ball milling for 4 hours, drying, grinding, sieving, and calcining at 1200 for 12 hours to obtain the matrix material. Then add 0.01 mole of ZnO, ball mill and mix for 4 hours, then dry, grind and sieve, add 0.05 mole of NaOH in a manual grinding manner, 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 A zirconate proton conductor material with good conductivity, the conductivity reaches 5.86×10 at 700°C -5 S / cm.

Embodiment 2

[0020] Take 1 mole of BaCO 3 , 0.70 mol ZrO 2 , 0.30 mole Y 2 o 3 The matrix material was prepared, and mixed by ball milling with water for 10 hours, dried, ground, sieved, and calcined at 1400 for 4 hours. Then add 0.10 mole of ZnO, ball mill and mix for 10 hours, then dry, grind and sieve, add 0.50 mole of NaOH in a manual grinding manner, 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 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 A zirconate proton conductor material with good electrical conductivity, with a conductivity of 4.29×10 at 700°C -4 S / cm. .

Embodiment 3

[0022] Take 1 mole of BaCO 3 , 0.90 mol ZrO 2 , 0.10 mole Y 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 0.03 mole of ZnO, mix by ball milling for 6 hours, then dry, grind and sieve, add 0.40 mole of NaOH in a manual grinding manner, and grind for 1 hour to ensure the uniformity 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 zirconate proton conductor material, the conductivity reaches 3.25×10 at 700°C -4 S / cm.

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Abstract

The invention relates to a barium zirconate proton conductor designed by complex phase structure with a high electric conductivity and its manufacturing method. The invention is coating a layer of NaOH or sulfate around the crystal grain of the barium zirconate. The manufacturing method is: taking the BaCO3, ZrO2 and Y2O3 as raw material, water as medium, ball milling mixing for 4-10 hours, calcining for 4-12 hours in 1200-1400 DEG C; then adding 1-10% molar ZnO, ball milling mixing for 4-10 hours, adding 5-50% mol NaOH or K2SO4 or Na2SO4 or Li2SO4 in a way of hand lapping to make the mixture uniform; putting the mixing material into the die and dry pressing molding under a pressure of 50-120 MPa, and then isopressing under 200-350 MPa; sintering in the air of 1200-1500 DEG C with a heating rate of 2-10 DEG C / minute and keeping warm for 2-10 hours, then cooling to the room temperature to produce the barium zirconate proton conductor material with a high electric conductivity. The invention adopts the new designing thought of complex phase structure to establish a foundation for exploiting hydrogen gas and vapor sensor, hydrogen pump and concentration cell electrolyte material.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a multi-phase structure designed high-conductivity barium zirconate proton conductor 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 solid oxide fuel cells (SOFC), hydrogen pumps (hydrogen separation), sensitive materials (humidity and hydrogen sensors), etc. Since Iwahara and others reported the proton conductivity and mechanism of doped perovskite cerate and zirconate, the research on various proton conductor materials at home and abroad is in the ascendant. A lot of research work has been carried out successively. In terms of improving the conductivity of proton conductors, although a lot of research work has been carried out, no satisfactory progress has been made, and the literature da...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B40/00C04B41/00H01B1/00
Inventor 郭瑞松彭珍珍高冬云戚雯余芬
Owner TIANJIN UNIV
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