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Electrocatalyst and fuel cell containing the same

A fuel cell and electrocatalysis technology, applied in fuel cells, battery electrodes, electrochemical generators, etc., can solve the problems of poor oxygen reduction activity, reducing the catalytic effect of cathode oxygen reduction reaction, and poor catalytic activity of water molecules.

Active Publication Date: 2013-01-30
IND TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor catalytic activity of water molecules of Ru, the platinum active centers on the surface are poisoned by carbon monoxide, which affects the methanol catalytic effect of the platinum catalyst.
[0005] In addition, although Pt is the most effective catalyst for catalyzing the oxygen reduction reaction (ORR) at the cathode, when the incompletely reacted methanol penetrates from the anode to the cathode through the proton exchange membrane, it will undergo an oxidation reaction with the Pt catalyst, resulting in a reduction in the mixed potential. The catalytic effect of the cathodic oxygen reduction reaction leads to the problem that the active center of the Pt catalyst is poisoned by CO
[0006] On the other hand, although it has been proposed that palladium-based catalysts have poorer reactivity with methanol than Pt, and therefore have better anti-CO poisoning properties than Pt, their oxygen reduction activity is not good.

Method used

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  • Electrocatalyst and fuel cell containing the same
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  • Electrocatalyst and fuel cell containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0027] [Example 1-4] synthesis of cathode electrode catalyst

[0028] Take Ketjen Black ECP300 as the carbon carrier and evenly disperse it in ethylene glycol. Weigh the required precursor PdCl according to the stoichiometry in Table 1 2 , Co(NO 3 ) 2 ·6H 2 O, (NH 4 ) 6 W 12 o 39 ·xH 2 O (Alfa Aesar company; product name: Ammonium tungsten oxide hydrate) and NaH 2 PO 2 ·H 2 O dissolves in aqueous NaCl to form an aqueous metal salt solution. Add the metal salt aqueous solution to the above-mentioned ethylene glycol with carbon support and disperse evenly. Then, the above solution was stirred with a magnet, and heated under reflux at 150° C. for 2 hours, so that the metal salt was reductively adsorbed onto the carbon support. After the temperature of the above solution was lowered to room temperature, it was filtered and the filter cake was washed. The obtained product is cathode catalyst example 1, wherein the metal element content ratio of Pd:Co:W:P is 68:15:10:7. ...

Embodiment 5

[0036] [Example 5] Sintering of cathode electrode catalyst

[0037] Example 1 was placed under a reduction atmosphere and sintered at 500° C. for 2 hours to obtain Example 5. In addition, Comparative Examples 3-5 were additionally prepared.

Embodiment 6-8

[0055] [Example 6-8] synthesis of anode electrode catalyst

[0056] According to the method described in Example 1, using Ketjen Black ECP300 as a carbon carrier, weigh the required H according to the stoichiometry in Table 7 2 PtCl 6 ·6H 2 O, RuCl 3 , (NH 4 ) 6 W 12 o 39 ·xH 2 O and NaH 2 PO 2 ·H 2 O, to synthesize the quaternary anode catalyst PtRuWP of Example 6. In addition, the preparations of Examples 7 and 8 were prepared with HAuCl 4 ·3H 2 O and CuCl 2 2H 2 O replaces the above (NH 4 ) 6 W 12 o 39 ·xH 2 O, then sample 7 (PtRuAuP) and sample 8 (PtRuCuP) can be formed. Table 7 is a list of the activities of the anode quaternary catalysts, wherein the three kinds of quaternary anode catalysts can all achieve good anode reaction catalytic activity.

[0057] The activity of table 7 anode catalyst (40 ℃, 5M CH 3 OH+0.5M H 2 SO 4 )

[0058]

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Abstract

The invention relates to an electrocatalyst and a fuel cell containing the same. The electrocatalyst includes a four-element catalyst having a formula of XYZP, wherein X is Pt or Pd, Y and Z are different elements selected from Group 6, Group 8, Group 9, or Group 11 elements, and P is phosphorous, wherein Group 6 elements include Cr, Mo, or W, Group 8 elements include Fe, Ru, or Os, Group 9 elements include Co, Rh, or Ir, and Group 11 elements include Cu, Ag, or Au.

Description

technical field [0001] The invention relates to an electrocatalyst, and in particular to an electrocatalyst for a fuel cell. Background technique [0002] Fuel cells have gradually attracted attention because of their high energy density and environmental protection requirements. Fuel cell is a new type of widely used electric energy supply system. Through electrochemical reaction, the chemical energy of fuel is converted into electric energy when electric energy is needed. It is a device that generates electric energy instantly. As long as the supply of fuel continues, there will be no shortage of electricity. The most commonly used fuels are hydrogen and methanol. Since both hydrogen and methanol can be obtained from renewable sources and will not cause environmental pollution, if fuel cells are used to replace fossil energy for power generation, environmental pollution can be reduced and the period of fossil fuel exhaustion can be extended. Currently, the fuel cell mar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/188B01J27/185H01M4/92H01M8/00
CPCH01M8/1011H01M8/00B01J27/185H01M4/92Y02E60/523H01M4/921B01J27/188Y02E60/50
Inventor 卢敏彦陈盈洁张美元
Owner IND TECH RES INST