Bismuth vanadate-based ceramic with tetragonal scheelite structure and high oxygen ion conductivity in medium-temperature zone and preparation method of bismuth vanadate-based ceramic

A bismuth vanadate-based ceramic, ionic conductivity technology, applied in cable/conductor manufacturing, oxide conductors, circuits, etc., can solve low safety, low chemical stability, wide application limitations of solid oxide fuel cell devices, etc. problem, to achieve the effect of low cost and simple preparation process

Inactive Publication Date: 2022-07-29
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Currently, available oxygen ion conductors yttrium-doped ZrO 2 Good ionic conductivity (oxygen ion conductivity ~ 10mS / cm) needs to be worked in a high temperature area above 800°C. A series of problems such as high cost, low chemical stability and low safety brought about by high working temperature make Widespread application of solid oxide fuel cell devices is severely limited

Method used

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  • Bismuth vanadate-based ceramic with tetragonal scheelite structure and high oxygen ion conductivity in medium-temperature zone and preparation method of bismuth vanadate-based ceramic
  • Bismuth vanadate-based ceramic with tetragonal scheelite structure and high oxygen ion conductivity in medium-temperature zone and preparation method of bismuth vanadate-based ceramic

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Embodiment Construction

[0013] Table 1 shows specific embodiments of the present invention and their electrical conductivity. The preparation method is as described above. The phase analysis of the sintered ceramic sample is carried out by powder X-ray diffractometry. figure 1 It is the X-ray diffraction pattern of the example of the present invention, which shows that a single tetragonal scheelite mineral phase is formed, and the electrical conductivity of the ceramic is evaluated by an alternating current impedance analyzer.

[0014] The invention can be widely used in the manufacture of electronic devices such as electrolytes, oxygen sensors and oxygen permeable membranes for medium temperature region solid oxide fuel cells, and can meet the requirements of all solid oxide fuel cells, oxygen sensors and oxygen permeation membranes in the medium temperature region of 500-700°C. Technical needs for related energy, transportation and chemical products.

[0015] Table 1:

[0016]

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Abstract

The invention discloses a tetragonal scheelite structure bismuth vanadate-based ceramic with high oxygen ion conductivity in a medium temperature zone and a preparation method thereof, and belongs to the technical field of preparation of novel solid-state ion conductors, the oxygen ion conductivity of the tetragonal scheelite structure bismuth vanadate-based ceramic reaches 0.92-6.2 mS / cm at 500-700 DEG C, and the chemical composition of the tetragonal scheelite structure bismuth vanadate-based ceramic is Bi < 0.85 > Ca < 0.15 > VO3. 925. The bismuth vanadate-based oxygen ion conductor with the tetragonal scheelite structure, disclosed by the invention, is simple in chemical composition and preparation process and low in cost, and can be applied to manufacturing of devices such as a solid oxide fuel cell, an oxygen sensor and an oxygen permeable membrane in a medium-temperature region.

Description

technical field [0001] The invention relates to solid ion conductor materials for electronic devices such as electrolytes, oxygen sensors and oxygen permeable membranes for solid oxide fuel cells in the medium temperature region and a preparation method thereof. Background technique [0002] Solid oxide fuel cells (SOFCs) are new and clean power generation devices that directly convert chemical energy into electrical energy. They have attracted increasing attention due to their environmental friendliness, high conversion efficiency of all-solid-state structures, flexible and diverse fuels, low emissions, and long-term stability. It has good application prospects in the fields of chemical industry, energy and transportation, and is considered to be one of the most promising clean energy sources in the field of sustainable energy materials in the future. Oxygen ion conductors are the core components of solid oxide fuel cells, which are used to transport charge carriers and eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622H01B1/06H01B1/08H01B13/00
CPCC04B35/453C04B35/622H01B1/08H01B1/06H01B13/00C04B2235/3239C04B2235/3208C04B2235/602C04B2235/656C04B2235/6567C04B2235/6583
Inventor 杨小燕匡小军
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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