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Application of catalyst in fuel cell SO2 poisoning resistance, and poisoning recovery method

A technology of fuel cells and fuel cell stacks, applied to battery electrodes, circuits, electrical components, etc., can solve problems such as inability to oxidize, and reducing atmosphere hinders SO2 oxidation and removal, and achieve the effect of performance recovery

Active Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the existing battery operating conditions, the method of increasing the amount of gas introduced or the method of introducing hydrogen to the anode and oxygen to the cathode under open circuit conditions cannot make the SO adsorbed on the surface of the catalyst 2 Complete oxidation, the reason is that hydrogen from the anode will permeate through the proton exchange membrane to the cathode, and the reducing atmosphere it brings hinders the SO 2 Oxidation removal; at the same time, only a specific catalyst has a strong enough self-catalytic oxidation removal of SO 2 Ability

Method used

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  • Application of catalyst in fuel cell SO2 poisoning resistance, and poisoning recovery method
  • Application of catalyst in fuel cell SO2 poisoning resistance, and poisoning recovery method
  • Application of catalyst in fuel cell SO2 poisoning resistance, and poisoning recovery method

Examples

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Embodiment 1

[0023] A single cell is assembled according to a method well known in the fuel cell field, wherein the active component of the cathode catalyst of the single cell is PtRu, and the Pt loading is 0.4 mg cm -2 . After the battery is activated by methods well known in the art, SO 2 Poisoning and performance recovery experiments after poisoning to evaluate the excellent SO resistance of PtRu catalysts 2 Poisoning performance, specifically reflected in the fact that its performance can be quickly and completely restored when it is purged with air; at the same time, the performance recovery method after poisoning is evaluated, specifically, the anode is fed with nitrogen or air or oxygen, and the cathode is fed with air or oxygen. The utility model has the characteristics of being convenient and easy to operate, and being applicable to electric piles. The specific activation and poisoning process is as follows:

[0024] The battery temperature is 60°C, the cathode and anode humidi...

Embodiment 2

[0027] On the basis of Example 1, in order to further illustrate the effectiveness of the poisoning recovery method described in this patent, repeat the poisoning and recovery method for the battery after the poisoning recovery for the first time, and perform the second poisoning and performance recovery operation , at this time, the cathode purge gas is changed to air, and the anode gas remains unchanged, and the polarization curve after performance recovery is measured, and the polarization curves in each case are obtained, see figure 2 . Depend on figure 2 It can be seen that after the second poisoning recovery, the battery performance is better than both the initial and the first poisoning recovery, which again shows the excellent resistance of PtRu to SO 2 Poisoning performance and excellent effect of the performance recovery method described in this patent.

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Abstract

The invention provides a cathode SO2 poisoning resistance catalyst suitable for a fuel cell, and a poisoning recovery method against the characteristics of easy SO2 adsorption and great reduction of performances of present fuel cell cathode Pt-based catalysts. A Pt-Ru alloy electro-catalyst with the Pt / Ru atom ratio of 1-5:0.5-5 has surface adsorbed SO2 self-catalysis oxidation performance and strong SO2 poisoning resistance as the cathode catalyst of the fuel cell. When Pt-Ru is adopted as the fuel cell cathode catalyst, air or nitrogen is introduced through anode after the SO2 poisoning of the fuel cell, and air or oxygen is introduced to the cathode to purge for 0.01-10h, so the performances of the catalyst can be completely recovered.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to an anti-SO 2 Poisoned catalysts and corresponding recovery methods. technical background [0002] Proton exchange membrane fuel cells (PEMFCs) usually use the noble metal Pt as a catalyst. When using air as a combustion aid, a small amount of SO in the air 2 (such as 1ppm) will be adsorbed on the surface of the catalyst in the battery, covering the surface active sites, and at the same time affecting the reaction process of catalytic oxygen reduction (ORR), greatly reducing the performance of the battery. When using a clean air environment, the performance is not restored or only slightly restored. [0003] Solving Fuel Cell SO 2 Poisoning strategies mainly include external purification and internal purification of the combustion accelerant. External purification usually adds an adsorption or adsorption oxidation device outside the battery, such as the patent applied by Dalian Chemi...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88
CPCY02E60/50
Inventor 邵志刚谢峰秦晓平张耕衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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