Method of preparing of nanometer electrocatalyst for proton exchange membrane fuel cell
First Claim
1. A method for preparing nanometer electrocatalyst for proton exchange membrane fuel cells, comprising the steps of:
- 1) adding in water a platinum halogen compound or a mixture of a platinum halogen compound and a ruthenium halogen compound, and active carbon, making the amount of noble metal in the solution in the range of 0.5-10 g/L, and the amount of active carbon in the range of 0.05-2 g/L;
2) adjusting the pH of the solution to 2.5-10.5 with potassium hydroxide and/or ammonium hydroxide;
3) adding dropwise a reducing agent to an amount of 2.5 to 5 times in excess of that of the noble metal in moles, and allowing the reduction reaction to proceed;
4) filtering off the liquid and washing the remains; and
6) drying the remains.
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Abstract
The present invention relates a method for preparing nanometer electrocatalyst for proton exchange membrane fuel cells, comprising the steps of: 1) adding in water a platinum halogen compound or a mixture of a platinum halogen compound and a ruthenium halogen compound, and active carbon, the amount of noble metal in the solution is 0.5-10 g/L, and the amount of active carbon is 0.05-2 g/L; 2) adjusting the pH of the solution to 2.5-10.5 with potassium hydroxide and/or ammonium hydroxide; 3) adding dropwise a reducing agent to an amount of 2.5 to 5 times in excess of that of the noble metal in moles, and allowing the reduction reaction to proceed; 4) filtering off the liquid and washing the remains; and 6) drying the remains. The catalysts prepared by the present invention have uniform particle sizes in the range of 4±0.5 nm, and superior electrochemical properties.
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Citations
6 Claims
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1. A method for preparing nanometer electrocatalyst for proton exchange membrane fuel cells, comprising the steps of:
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1) adding in water a platinum halogen compound or a mixture of a platinum halogen compound and a ruthenium halogen compound, and active carbon, making the amount of noble metal in the solution in the range of 0.5-10 g/L, and the amount of active carbon in the range of 0.05-2 g/L;
2) adjusting the pH of the solution to 2.5-10.5 with potassium hydroxide and/or ammonium hydroxide;
3) adding dropwise a reducing agent to an amount of 2.5 to 5 times in excess of that of the noble metal in moles, and allowing the reduction reaction to proceed;
4) filtering off the liquid and washing the remains; and
6) drying the remains. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification