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Anion conductor and layered metal hydroxide

A layered metal, hydroxide technology, applied in rare earth metal oxide/hydroxide, rare earth metal compound, yttrium oxide/yttrium hydroxide and other directions, can solve the problem of lack of heat resistance of anion exchange membrane, achieve physical Excellent properties, simple composition and easy control

Inactive Publication Date: 2016-11-09
TOKUYAMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, anion exchange membranes generally suffer from a lack of heat resistance

Method used

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  • Anion conductor and layered metal hydroxide
  • Anion conductor and layered metal hydroxide
  • Anion conductor and layered metal hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1(︰ Y2(OH)5(NO3)-nH2O Synthetic example 1

[0099] By Y(NO of 0.44mol / l 3 ) 3 Aqueous solution 11.25ml, dropwise add 2.1mol / l NaOH and 1.44mol / l NaNO 3 3.75 ml of the mixed aqueous solution was stirred to obtain a white precipitate. The solution containing this white precipitate was put into an airtight container and left to stand at 25° C. for 30 hours. Thereafter, it was transferred to a centrifuge container, centrifuged (15,000 rpm, 30 minutes, 20° C.), and a white precipitate was collected. The white precipitate and water were put into a centrifugation container, and the operation (washing operation) of removing only water after centrifugation was repeated four times to remove remaining raw materials. Thereafter, 0.8 g of a white powdery product (compound 1) was obtained by vacuum drying at room temperature.

[0100] Analysis of the crystal structure by FT-IR (Fourier Transform Infrared Spectroscopy) and XRD confirmed that the crystal structure of compound 1 has a layered structure, and the composition is [Y 2 ...

Embodiment 2

[0101] Embodiment 2 (basic layered yttrium hydroxide: [Y 2 (OH) 5 (NO 3 )-nH 2 O] synthesis example 2)

[0102] A heat-resistant container was used for the airtight container, and the temperature when standing for 30 hours was 50, 75, 100, 125, 150°C, and the same operation as in Example 1 was carried out to obtain [Y 2 (OH) 5 (NO 3 )-nH 2 O] (Compounds 2-6). Table 1 shows the physical properties of the obtained compounds 2-6. When the temperature is raised, the half-width of the peak of the spectrum measured by XRD becomes smaller, and it can be seen that the particle size becomes larger.

[0103] [Table 1]

[0104]

Embodiment 3

[0105] Embodiment 3 ([Y 2 (OH) 5 (NO 3 ) x (CO 3 ) y -nH 2 O] synthesis example)

[0106] Y obtained in the same way as in Example 1 2 (OH) 5 (NO 3 ) powder 1.3g, impregnated in K at 25°C 2 CO 3 In aqueous solution for 7 days, the nitrate ions (NO 3 - ) to carbonate ion (CO 3 2- ) replacement. After the FT-IR analysis of the white powder (compound 7) after the cleaning operation, the result showed the presence of carbonate ions. - The peak of the asymmetric stretching vibration (1521cm -1 )Increase. From this, it can be confirmed that the substitution of carbonate ions proceeds.

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Abstract

The present invention provides a novel anion conductor which comprises a layered metal hydroxide and can be used as an alkaline electrolyte film for use in a fuel cell or the like. An anion conductor characterized by comprising a molded product of a layered metal hydroxide represented by formula (1): [Mx(OH)y(A)([alpha]x-y) / z-nH2O] (wherein M represents a metal that can serve as a bivalent or trivalent cation; [alpha] represents the number of valency of the metal M, A represents an atom or an atomic group that can serve as an anion, and z represents the number of valency of the anion A, wherein, when ([alpha]x-y) / z is 2 or greater, A's may be different types of anions which can serve as anions having the same valencies as each other, or may be anions having different valencies from each other; and n represents the average number of molecules of interlayer water contained per one repeating unit). The anion conductor according to the present invention is composed of an inorganic material, and therefore has excellent heat resistance and physical strength and can be operated for a longer period at a higher temperature compared with the conventional ones when used as an anion conductor for a fuel cell, an air cell or the like.

Description

technical field [0001] The present invention relates to anion conductors and novel layered metal hydroxides usable as anion conductors. Background technique [0002] A fuel cell is a power generation system that extracts chemical energy as electricity. According to its operating mechanism and materials used, it is classified into alkaline type, phosphoric acid type, molten carbonate type, solid electrolyte type, solid polymer type, etc., and various types of fuel cells have been proposed and studied. Among them, alkaline fuel cells and solid polymer fuel cells are expected to be used as stationary power sources and in-vehicle applications in addition to portable power sources because their operating temperatures are as low as 200°C. Small and medium-sized low-temperature operation fuel cells. [0003] A solid polymer fuel cell is a fuel cell that uses a solid polymer such as an ion exchange resin as an electrolyte, and is characterized by a relatively low operating tempera...

Claims

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Application Information

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IPC IPC(8): H01M8/1016C01F17/00C01G3/00C01G3/02C01G9/00C01G9/02H01B1/04H01B1/06C01F17/218H01M50/437H01M50/489H01M50/497
CPCC01G3/00C01G9/00H01B1/06H01B1/04C01P2002/22C01P2002/72C01P2004/61C01P2004/62C01P2004/64C01P2006/40C01G3/02C01G9/02H01M8/083H01M12/08H01M2300/0068C01P2006/60H01M8/1016Y02E60/10Y02E60/50C01F17/218H01M50/497H01M50/489H01M50/437H01M8/1004C01F17/206H01M4/926C01F17/247C01F17/276C01G3/08H01M2300/0014H01M50/431
Inventor 镰田海渡边申柳裕之
Owner TOKUYAMA CORP
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