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Electrochemical oxygen reduction catalyst

A catalyst and electrochemical technology, applied in the field of electrochemical oxygen reduction catalysts, can solve the problems of increasing platinum and insufficient activity, and achieve the effect of inhibiting and improving

Active Publication Date: 2020-12-18
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even with these methods, the activity is still insufficient and the amount of platinum needs to be increased

Method used

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Examples

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preparation example Construction

[0137] The preparation method of the electrochemical oxygen reduction catalyst of the present invention is not particularly limited. For example, at least one selected from the group consisting of melamine compounds, thiocyanuric acid compounds, and polymers containing melamine compounds or thiocyanuric acid compounds as monomers can be supported on the platinum-containing on the nanoparticles.

[0138] For example, in the solution drying method, at least one compound containing platinum nanoparticles (especially a platinum catalyst) and a polymer selected from the group consisting of a melamine compound, a thiocyanuric acid compound, and a polymer containing a melamine compound or a thiocyanuric acid compound as a monomer one is dissolved or dispersed (suspended) in a solvent in advance, and then stirred as necessary; therefore, at least One is adsorbed on platinum-containing nanoparticles (particularly platinum catalysts). Thereafter, the catalyst of the present invention ...

Embodiment

[0156] The present invention will be described in more detail below with reference to Examples and Comparative Examples. The present invention is not limited to the following examples. As melamine, commercially available products produced by Tokyo Chemical Industry Co., Ltd. were used: 1,3,5-triazine, diaminodiethylamino-1,3,5-triazine, and 2,4-diamino-6 -Butylamino-1,3,5-triazine; and as 2,4,6-tris(dimethylamino)-1,3,5-triazine, produced by Sigma Aldrich Co., LLC was used commercially available product.

Synthetic example 1

[0157] Synthesis Example 1: Melamine Resin

[0158] [chemical formula 16]

[0159]

[0160] As the melamine resin raw material, a commercially available product (manufactured by Sigma Aldrich Co., LLC; number average molecular weight: 432) was used. The feed was diluted to 5% by weight with 1-butanol. The diluted solution (27 μL) was dissolved in a mixed solvent of ultrapure water (5.14 mL) and 2-propanol (1.62 mL) to prepare a melamine resin coating solution. The melamine resin coating solution (3.6 μL) was added dropwise to a glassy carbon electrode (surface area: 0.0707 cm 2 ), and then dried in an oven at 100°C for 15 minutes to increase the degree of polymerization. Thus, the melamine resin coating liquid was fixed to the electrodes. The melamine resin thus obtained can be presumed to be a compound in which a plurality of monomers are combined, and has a repeating unit represented by formula (2A).

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Abstract

This electrochemical oxygen reduction catalyst contains: nanoparticles containing platinum; and at least one selected from the group consisting of a melamine compound, a thiocyanuric acid compound, and a polymer containing, as a monomer, the melamine compound or the thiocyanuric acid compound, and has high oxygen reduction activity (low overvoltage).

Description

technical field [0001] The present invention relates to electrochemical oxygen reduction catalysts. Background technique [0002] Polymer electrolyte fuel cells (PEFCs) are expected to become popular in the near future due to their compact size and high efficiency and from the viewpoint of global environmental issues. [0003] Polymer electrolytes used in PEFCs are usually highly acidic cation exchange membranes; therefore, electrode catalysts must function stably under highly acidic conditions. Therefore, platinum or platinum-containing alloys are currently the only viable electrode catalysts for practical use. [0004] The electrode reaction that occurs in the air electrode (cathode) of PEFC is the oxygen reduction reaction. Even when platinum is used as an electrode catalyst, the overvoltage in the electrochemical oxygen reduction reaction (ie, the air electrode reaction during discharge) is high. Losses at the air electrode are a major factor in power reduction. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86B01J31/28H01M4/92H01M12/08H01M8/10
CPCH01M12/08H01M4/926H01M4/9008H01M2004/8689H01M4/8652B01J31/06C08G73/0644H01M4/8663
Inventor 朝日将史
Owner NAT INST OF ADVANCED IND SCI & TECH
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