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Electrode catalyst, gas diffusion electrode-forming composition, gas diffusion electrode, membrane electrode assembly, and fuel cell stack

A catalyst and electrode technology, applied in the field of catalysts for electrodes, to achieve the effect of reducing manufacturing costs

Active Publication Date: 2017-09-26
N E CHEMCAT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the methods for producing catalysts for electrodes (core / shell catalysts) disclosed in the above-mentioned Patent Documents 4 to 6 disclose the idea that battery performance will decrease if halogens remain in the electrodes. Chlorine, only the reduction / removal of said chlorine is addressed

Method used

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  • Electrode catalyst, gas diffusion electrode-forming composition, gas diffusion electrode, membrane electrode assembly, and fuel cell stack
  • Electrode catalyst, gas diffusion electrode-forming composition, gas diffusion electrode, membrane electrode assembly, and fuel cell stack
  • Electrode catalyst, gas diffusion electrode-forming composition, gas diffusion electrode, membrane electrode assembly, and fuel cell stack

Examples

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Embodiment 1

[0319] The electrode catalyst of the present invention was produced by the following process. In addition, the raw material of the catalyst for electrodes used in the Example is as follows.

[0320] Carbon black powder: trade name "Ketjen Black EC300" (manufactured by Ketjen Black International Co., Ltd.)

[0321] · Sodium tetrachloropalladate(II)

[0322] · Palladium nitrate

[0323] ·Potassium chloroplatinate

[0324] [Preparation of palladium-supported carbon]

[0325] Carbon black powder was used as a carrier of the electrode catalyst, and this was dispersed in water to prepare a 5.0 g / L dispersion. 5 mL of sodium tetrachloropalladate (II) aqueous solution (concentration: 20% by mass) was added dropwise to the dispersion and mixed. After adding 100 mL of sodium formate aqueous solution (100 g / L) dropwise to the obtained dispersion, filter the insoluble components, wash the filtered insoluble components with pure water, and dry them to obtain carbon with palladium supp...

Embodiment 2～3

[0338] Except changing the time that electrode catalyst precursor 1 is immersed in aqueous sodium formate (0.0028M) and the number of times of filtering / cleaning with ultrapure water, the same as in Example 1, prepared a platinum (Pt ), the supported amount of palladium (Pd), the concentration of the chlorine (Cl) form, and the concentration of the bromine (Br) form are the electrode catalysts of Examples 2 to 3.

[0339] In the same manner as in Example 1, ICP analysis was performed on the obtained electrode catalysts of Examples 2 to 3, and the supported amount of platinum and the supported amount of palladium were measured.

Embodiment 4～5

[0341] In addition to changing the concentration of the sodium formate aqueous solution for impregnating the electrode catalyst precursor 1, the time for the electrode catalyst precursor 1 to be immersed in the sodium formate aqueous solution, and the number of times of filtering / cleaning with ultrapure water, the same method as in Example 1 was prepared. Catalysts for electrodes of Examples 4 to 5 with the loading amount of platinum (Pt), the loading amount of palladium (Pd), the concentration of chlorine (Cl) form, and the concentration of bromine (Br) form shown in Table 1. In addition, the concentration of the sodium formate aqueous solution used in Example 4 was 0.0025M, and the concentration of the sodium formate aqueous solution used in Example 5 was 0.0040M.

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Abstract

Provided is an electrode catalyst in which the content of chlorine (Cl) species and bromine (Br) species is reduced to a prescribed level or lower, said electrode catalyst being capable of exhibiting sufficient catalytic performance. The electrode catalyst is provided with a core / shell structure including: a carrier; a core part formed on the carrier; and a shell part formed so as to cover at least a portion of the surface of the core part. The electrode catalyst is characterized in that: the concentration of bromine (Br) species as measured by X-ray fluorescence (XRF) analysis is not more than 400 ppm; and the concentration of chlorine (Cl) species as measured by X-ray fluorescence (XRF) analysis is not more than 900 ppm.

Description

technical field [0001] The present invention relates to catalysts for electrodes. In addition, the present invention also relates to a composition for forming a gas diffusion electrode, a gas diffusion electrode, a membrane / electrode assembly, and a fuel cell stack including the above catalyst for electrodes. Background technique [0002] A so-called solid polymer fuel cell (Polymer Electrolyte Fuel Cell: hereinafter referred to as "PEFC" as needed) operates at a temperature ranging from room temperature to about 80°C. In addition, since PEFC can use cheap and widely used plastics and the like for components constituting the main body of the fuel cell, it can achieve weight reduction. Furthermore, PEFC can realize the thinning of the solid polymer electrolyte membrane, and further reduce the resistance, so that the power generation loss can be relatively easily reduced. Since such PEFC has many advantages, it can be applied to fields such as fuel cell vehicles and househol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86B01J23/44B01J23/89H01M4/92H01M8/1004H01M8/1018
CPCB01J23/89H01M8/10H01M4/86H01M4/92H01M4/9058H01M4/925B01J23/44H01M4/9075Y02E60/50H01M4/8657H01M4/9041H01M4/926H01M8/1004H01M2008/1095C01G55/005G01N23/223H01M8/141
Inventor 永森圣崇水崎智照中村叶子五十岚宽关安宏
Owner N E CHEMCAT