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Colloidal dispersions comprising precious metal particles and acidic ionomer components and methods of their manufacture and use

A colloidal dispersion, precious metal technology, used in the field of electrodes and composite catalyst materials, the manufacture of ionomer layers, catalyst layers, and the composition of acidic ionomer compounds

Inactive Publication Date: 2015-11-11
格林纳瑞缇有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In both cases, complex and costly steps in the catalyst layer generation are necessary

Method used

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  • Colloidal dispersions comprising precious metal particles and acidic ionomer components and methods of their manufacture and use
  • Colloidal dispersions comprising precious metal particles and acidic ionomer components and methods of their manufacture and use
  • Colloidal dispersions comprising precious metal particles and acidic ionomer components and methods of their manufacture and use

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0200] Preparation of composition (pre-product) containing Pt precursor compound and acidic ionomer

[0201] Dilute a water-based ionomer dispersion with deionized water D83-24B (from Solvay Specialty Polymers, Italy; 24% by weight ionomer; equivalent weight EW=830g / equivalent) in order to obtain an ionomer dispersion with the following composition:

[0202] 20% by weight solid ionomer

[0203] 80% by weight D.I. water

[0204] Charge 100 g of this ionomer dispersion into a 300 ml vessel. Subsequently, 375 g of grinding media (small Zr oxide beads) was added to the dispersion. Next, 1.06g platinum hexahydroxide (IV) acid H 2 Pt(OH) 6 (65% by weight Pt, Umicore AG & CoKG, Hanau / Germany) was added to the vessel and ground for 2 hours until the particle size of the Pt precursor compound reached the micron range. A yellow fluid composition was obtained, containing 0.68% by weight of Pt, 19.8% by weight of ionomer, and a Pt:ionomer ratio of 1:29.

example 2

[0206] Preparation of colloidal Pt / ionomer dispersion

[0207] A water-based ionomer dispersion D83-24B (from Solvay Specialty Polymers, Italy; 24% by weight ionomer; equivalent weight EW=830 g / equivalent) was concentrated by evaporation to obtain a 28.1% by weight ionomer dispersion in water. Add 1-propanol to this dispersion in order to obtain an ionomer dispersion with the following composition by mass:

[0208]

[0209] Charge 100 g of this ionomer dispersion into a 300 ml vessel. Subsequently, 375 g of grinding media (small Zr oxide beads) was added to the dispersion. Next, 1.06g platinum hexahydroxide (IV) acid H 2 Pt(OH) 6 (65% by weight Pt, Umicore Co., Ltd., Hanau / Germany) was added to the vessel and ground in a bead mill for 2 hours. The precursor compound is very well dispersed in the liquid ionomer, and the particles are in the micron range.

[0210] The obtained dispersion was stirred for 24 hours and reduced to produce a colloidal dispersion containing ionomer and ...

example 3

[0213] Preparation of colloidal Pt / ionomer dispersion

[0214] A water-based ionomer dispersion D83-24B (from Solvay Specialty Polymers, Italy; 24% by weight ionomer; equivalent weight EW=830 g / equivalent) was concentrated by evaporation to obtain a 28.1% by weight ionomer dispersion in water. Ethanol is added to this dispersion in order to obtain an ionomer dispersion having the following composition by mass:

[0215]

[0216] Charge 100 g of this ionomer dispersion into a 300 ml vessel. Subsequently, 375 g of grinding media (small Zr oxide beads) was added to the dispersion.

[0217] Next, 1.06g platinum hexahydroxide (IV) acid H 2 Pt(OH) 6 (65% by weight Pt, Umicore Co., Ltd., Hanau / Germany) was added to the vessel and ground in a bead mill for 2 hours. The precursor compound is very well dispersed in the liquid ionomer, and the particles are in the micron range.

[0218] The obtained dispersion was stirred for 24 hours and reduced to produce a colloidal dispersion containing i...

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Abstract

The invention relates to colloidal dispersions comprising nano-sized precious metal particles (e.g. platinum or platinum alloy particles) and at least one ionomer component having acidic groups. The method for its manufacturing is based on a neutralization and dissolving process of a suitable precious metal precursor compound with a liquid acidic ionomer component, followed by a reduction step. Suitable precious metal precursors consist of precious metal atoms, hydrogen atoms, oxygen atoms and optionally carbon atoms. Examples for precursors are H 2 Pt(OH) 6 , Pd(OH) 2 or Ir(OH) 4 , preferred reducing agents are aliphatic alcohols or hydrogen. The invention further relates to pre-products for the manufacture of such colloidal dispersions, namely to compositions which contain precious metal precursors and at least one acidic ionomer compound. The colloidal precious metal dispersions are essentially free of contaminants such as salts or surfactants and may further contain electrically conductive or non-conductive support materials. The colloidal precious metal dispersions can be used for the preparation of catalyst inks, ionomer layers, catalyst layers, electrodes or composite catalyst materials and find broad application in fuel cell technology (e.g. PEMFC, DMFC or water electrolysers).

Description

Invention field [0001] The present invention relates to a colloidal dispersion comprising nano-scale noble metal-based particles and at least one ionomer component having acidic groups. A method for manufacturing such noble metal-based colloidal dispersions is disclosed. In this context, the present invention further relates to a pre-product for its manufacture, that is, a composition comprising a suitable noble metal precursor compound and at least one acidic ionomer compound. Finally, the present invention relates to catalyst inks containing such colloidal dispersions and to methods of using them to make ionomer layers, catalyst layers, electrodes, and composite catalyst materials. [0002] By using suitable reducing agents such as alcohols or hydrogen, the pre-product compositions containing a suitable noble metal precursor compound and at least one acidic ionomer compound are converted into colloidal dispersions of noble metal particles. The state dispersion is stabilized by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B01J13/00B01J23/42C25B11/04C25B9/23
CPCH01M4/926B01J13/0043C25B11/0442H01M4/8828H01M4/921Y02E60/50C25B11/073H01M4/8663H01M4/92H01M4/925
Inventor M·班德G·海因茨A·格希尔米H·德齐阿拉斯V·贝尼斯
Owner 格林纳瑞缇有限公司
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