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Hydrogen-generating material and process for producing the same

A manufacturing method and technology of metal powder, which can be used in the production of hydrogen, fuel cells, electrochemical generators, etc., and can solve the problems of poor affinity and wettability, etc.

Inactive Publication Date: 2008-05-07
HITACHI MAXELL ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] However, when organic matter such as stearic acid or stearate exists on the surface, the affinity with water, that is, the wettability to water deteriorates.

Method used

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  • Hydrogen-generating material and process for producing the same
  • Hydrogen-generating material and process for producing the same
  • Hydrogen-generating material and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The average particle size produced by the spray method is 55μm, and the BET specific surface area is 0.6m 2 6g of aluminum powder per gram and 18g of an organic solvent corrosive to aluminum shown in Table 1 below are put into a pulverization container together with particles made of zirconia, placed in a planetary ball mill, and the container is rotated at a speed of 200rpm. Rotate for 1 hour to pulverize the aluminum powder. Thereafter, the solvent was removed by drying under reduced pressure to obtain the target aluminum powder. When the average particle diameter of the pulverized aluminum powder was measured by the laser diffraction / scattering method using "Microtrac HRA" manufactured by Nikkiso Co., Ltd., the value of the 50% particle diameter as the volume-based cumulative fraction was in the tens of tens. μm. In addition, when the specific surface area was measured by the BET method using "Macsorb HM model-1201" manufactured by Mauntec Co., Ltd., the specific s...

Embodiment 2

[0094] Aluminum was pulverized in the same manner as in Example 1, except that methanol and toluene were mixed as a processing solvent in the content ratio shown in Table 3, and the container was rotated for 70 minutes using 18 g of the processing solvent, and the average particle diameter of the obtained powder was measured. In addition, the amount of hydrogen generation and the maximum hydrogen generation rate were obtained by the same method as in Example 1. The results are shown in Table 3.

[0095] [table 3]

[0096] The ratio of methanol and toluene in the processing solvent

[0097] As the processing solvent used in the pulverization step, in methanol as an organic solvent corrosive to aluminum, when adding toluene as an organic solvent inert to aluminum and mixing the solvent for use, hydrogen can be efficiently generated, 95% to 97% of the theoretical value of hydrogen generation can be produced.

Embodiment 3

[0099] Using the hydrogen generator shown in Fig. 1, hydrogen is generated in the following procedure. Aluminum powder was prepared in the same manner as in Example 1 using methanol as an organic solvent. 3.2 g of the aluminum powder, α-Al as a reaction accelerator 2 o 3 0.24 g of powder and 0.52 g of calcium oxide as an exothermic material are mixed together as a hydrogen generating material, and they are put into a container body 1a and a lid 1b made of aluminum with an inner volume of 9 cm. 3 The inside of container 1 and seal it. Furthermore, by arranging expanded polystyrene with a thickness of 8 mm as the heat insulating material 8 outside the container 1, a hydrogen generating device having the hydrogen generating material 2 was constructed. Next, water was supplied into the container 1 at a flow rate of 0.023 mL / min through the water supply pipe 5 by the micropump 9 .

[0100] With continuous water supply, the temperature of the container rose slowly, and after 20 ...

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Abstract

The present invention provides a process for producing a hydrogen-generating material comprising at least one metal powder selected from the group consisting of an aluminum powder and an aluminum alloy powder, characterized by mechanically pulverizing aluminum or an aluminum alloy in a treating solvent comprising an organic solvent having the property of corroding aluminum to thereby form a metal powder composed of flaky particles. The hydrogen-generating material comprises, for example, at least one metal powder selected from the group consisting of an aluminum powder and an aluminum alloy powder, the metal powder being composed of flaky particles and at least 60 wt.% of the aluminum contained in the metal powder being present in a metallic state. The metal powder has a carbon content, as determined by the infrared absorption method after combustion, of 0.5 wt.% or lower.

Description

technical field [0001] The present invention relates to a hydrogen generating material that generates hydrogen by reacting with water and a method for producing the same. Background technique [0002] In recent years, with the popularization of wireless devices such as personal computers and mobile phones, there has been an increasing demand for smaller and higher capacity secondary batteries as their power sources. Lithium-ion secondary batteries are currently in practical use as secondary batteries that have high energy density and are designed to be compact and lightweight, and demand for them as portable power sources is increasing. However, the lithium secondary battery has not yet reached a level to ensure a sufficient continuous use time depending on the type of wireless equipment used. [0003] In this case, one example of a battery capable of satisfying the above-mentioned requirements is a solid polymer fuel cell. A solid polymer fuel cell in which a solid polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/08B22F9/04B22F1/00H01M8/06H01M8/0612
CPCB22F2009/041Y02E60/50Y02E60/36
Inventor 三木健中井敏浩川边启佑西原昭二
Owner HITACHI MAXELL ENERGY LTD
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