Catalyst for fuel cells and method for producing same
AssigneeCataler Corporation
InventorKosuke Miyazaki
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Abstract
A catalyst for fuel cells that contains a carbon powder carrier and catalyst particles carried on the carbon powder carrier, the catalyst particles being Pt alloy particles, the catalyst for fuel cells having 0.65 mmol/g or more of hydrophilic groups, and a Pt elution amount when 0.5 g of the catalyst for fuel cells is immersed in 30 ml of a 0.5 mol/L aqueous sulfuric acid solution and retained for 100 hours at room temperature under stirring being 0.625 mg or less per g of the catalyst for fuel cells.
Claims16
A fuel cell catalyst, comprising a carbon powder carrier, and catalyst particles carried on the carbon powder carrier, wherein
- the catalyst particles are Pt alloy particles,
- the fuel cell catalyst has 0.65 mmol/g or more of hydrophilic groups, and
- when 0.5 g of the fuel cell catalyst is immersed in 30 mL of a 0.5 mol/L sulfuric acid solution and maintained at room temperature for 100 hours while stirring, an elution amount of Pt is 0.625 mg or less per gram of the fuel cell catalyst.
A method for the production of a fuel cell catalyst, comprising a carbon powder carrier, and catalyst particles carried on the carbon powder carrier, wherein
- the catalyst particles are Pt alloy particles,
- the fuel cell catalyst has 0.65 mmol/g or more of hydrophilic groups, and
- when 0.5 g of the fuel cell catalyst is immersed in 30 mL of a 0.5 mol/L sulfuric acid solution and maintained at room temperature for 100 hours while stirring, an elution amount of Pt is 0.625 mg or less per gram of the fuel cell catalyst, and
- the method comprises the steps of:
- carrying the catalyst particles on the carbon powder carrier to prepare a catalyst particle-carrying carbon powder;
- contacting the catalyst particle-carrying carbon powder with an oxidizing agent to impart the hydrophilic groups to the catalyst particle-carrying carbon powder to prepare a fuel cell catalyst precursor;
- and
- contacting the fuel cell catalyst precursor with a reducing agent to prepare the fuel cell catalyst.
Dependencies are inferred from the claim text.