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Fuel cell electrode catalyst comprising binary platinum alloy and fuel cell using the same

A fuel cell electrode and fuel cell technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of increasing the possibility of cross-leakage, and achieve the effect of improving initial performance and durability

Inactive Publication Date: 2009-04-15
CATALER CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These defects of the polymer membrane itself are also factors that increase the possibility of cross-leakage

Method used

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  • Fuel cell electrode catalyst comprising binary platinum alloy and fuel cell using the same
  • Fuel cell electrode catalyst comprising binary platinum alloy and fuel cell using the same
  • Fuel cell electrode catalyst comprising binary platinum alloy and fuel cell using the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049] First, 4.95 g of a commercially available toner having a large specific surface area was added and dispersed in 0.5 L of pure water. A hexahydroxoplatinum nitrate solution containing 4.05 g of platinum and an iridium nitrate solution containing 1.00 g of iridium were dropped into the liquid dispersion in this order. The liquid dispersion is thoroughly mixed with the carbon. About 100 mL of 0.1N ammonia was added to the liquid dispersion, and the liquid dispersion was adjusted to a pH of 10. The corresponding hydroxides are formed and precipitated on carbon. The liquid dispersion was filtered and the powder containing was dried in vacuo at 100°C for 10 hours. Then, the powder was kept under a hydrogen atmosphere at 400° C. for 2 hours so as to be reduced. Next, the powder was kept at 600° C. for 2 hours in the presence of nitrogen for alloying.

[0050] The metal loading density of the obtained platinum alloy supported carbon powder catalyst was such that the catalys...

example 2

[0053] The fed amounts of carbon, platinum, and iridium were 5.33 g, 4.36 g, and 0.30 g, respectively. The product ratio of Pt, Ir, and C is 1:0.08:1.2 (wt% ratio). A catalyst was prepared in the same manner as in Example 1.

example 3

[0055] The fed amounts of carbon, platinum, and iridium were 3.81 g, 3.12 g, and 3.07 g, respectively. The product ratio of Pt, Ir, and C is 1:1:1.2 (wt% ratio). A catalyst was prepared in the same manner as in Example 1.

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Abstract

An object of the present invention is to provide a fuel cell electrode catalyst which offers an improved durability while inhibiting the degradation of an initial catalytic activity to exhibit a stably high catalytic activity over a long period. The present invention provides a fuell cell electrode catalyst having an alloy carried by carbon, the alloy consisting of platinum and a platinum-family metal other tha platinum, characterized in that a composition ratio of platinum to platinum-family metal other than platinum to carbon is 1:(0.03 to 1.5):(0.46 to 2.2) (wt ratio).

Description

technical field [0001] The present invention relates to a fuel cell electrode catalyst exhibiting initial activity and high durability, and a fuel cell having such an electrode catalyst. Background technique [0002] Fuel cells have received much attention as a clean power generation system; the product of the cell reaction is mainly water, which has little negative impact on the global environment. For example, a solid polymer fuel cell has a proton-conducting solid polymer electrolyte membrane and a pair of electrodes provided on respective surfaces of the solid polymer electrolyte membrane. Hydrogen gas is supplied as a fuel gas to one of the electrodes (fuel electrode: anode), and at the same time, oxygen or air is supplied as an oxidant to the other electrode (air electrode: cathode). Therefore, an electromotive force is obtained. [0003] The cell characteristics of solid polymer fuel cells have been greatly improved for the following reasons. (1) A polymer electrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/92B01J23/42
CPCH01M2008/1095H01M4/926H01M4/92H01M4/9041Y02E60/50H01M4/921
Inventor 河村哲雄高桥宏明榎本晋寺田智明永田贵宽
Owner CATALER CORP
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