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Regeneration device and regeneration method for eliminating poisoning influence of air impurities on oxygen electrode electrocatalyst

An electrocatalyst and regeneration device technology, applied in the field of electrocatalysis, can solve problems such as high oxidation potential, influence on catalyst stability, and difficult detoxification conditions, and achieve the effects of simple operation, elimination of poisoning effects, and convenient portability

Active Publication Date: 2021-01-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the oxidation potential is high, and the cyclic voltammetry scans to 1.5V, and it takes at least 8 cycles to remove all the sulfur-containing substances on the surface of the catalyst.
The detoxification conditions of high-potential oxidation are not only difficult to achieve, but also have a great impact on the stability of the catalyst.

Method used

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  • Regeneration device and regeneration method for eliminating poisoning influence of air impurities on oxygen electrode electrocatalyst
  • Regeneration device and regeneration method for eliminating poisoning influence of air impurities on oxygen electrode electrocatalyst
  • Regeneration device and regeneration method for eliminating poisoning influence of air impurities on oxygen electrode electrocatalyst

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specific Embodiment approach 1

[0035] A regeneration method for eliminating the influence of air impurities on the poisoning of an oxygen electrode electrocatalyst, comprising the steps of:

[0036] Step 1. Replacement adsorption: place the poisoned oxygen electrode in the x environment, the use of NO x To replace the poisoning substances on the surface of the electrocatalyst that adsorbs the oxygen electrode, the NO x The environment is liquid NO x environment;

[0037] Step 2. Electrochemical reduction: the cathode of the battery after step 1 is replaced with nitrogen gas, and the anode is fed with hydrogen gas to carry out electrochemical reduction reaction and complete the regeneration of the oxygen electrode electrocatalyst.

[0038] The regeneration method described in this embodiment to eliminate the influence of air impurities on the poisoning of the oxygen electrode electrocatalyst is applied to the poisoned oxygen electrode of this embodiment if it has been depleted by SO 2 The cathode of a po...

specific Embodiment approach 2

[0047] A regeneration method for eliminating the influence of air impurities on the poisoning of an oxygen electrode electrocatalyst, comprising the steps of:

[0048] Step 1. Replacement adsorption: place the poisoned oxygen electrode in the x environment, the use of NO x To replace the poisoning substances on the surface of the electrocatalyst that adsorbs the oxygen electrode, the NO x The environment is gaseous NO x environment;

[0049] Step 2. Electrochemical reduction: the cathode of the battery after the adsorption in step 1 is replaced with argon gas, and the anode with hydrogen gas to carry out electrochemical reduction reaction and complete the regeneration of the oxygen electrode electrocatalyst.

[0050] A regeneration method for eliminating the influence of air impurities on the poisoning of the oxygen electrode electrocatalyst described in this embodiment is applied to the poisoned oxygen electrode of this embodiment if it has been depleted by H 2 The cathod...

specific Embodiment approach 3

[0056] A regeneration method for eliminating the influence of air impurities on the poisoning of an oxygen electrode electrocatalyst, comprising the steps of:

[0057] Step 1. Replacement adsorption: place the poisoned oxygen electrode in the x environment, the use of NO x To replace the poisoning substances on the surface of the electrocatalyst that adsorbs the oxygen electrode, the NO x The environment is gaseous NO x environment;

[0058] Step 2. Electrochemical reduction: the cathode of the battery after step 1 is replaced with nitrogen gas, and the anode is fed with hydrogen gas to carry out electrochemical reduction reaction and complete the regeneration of the oxygen electrode electrocatalyst.

[0059] The regeneration method described in this embodiment to eliminate the influence of air impurities on the poisoning of the oxygen electrode electrocatalyst is applied to the poisoned oxygen electrode of this embodiment as the oxygen electrode that has been depleted by N...

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Abstract

The invention discloses a regeneration device and a regeneration method for eliminating poisoning influence of air impurities on an oxygen electrode electrocatalyst, and belongs to the field of electrocatalysis. The technical problem to be solved by the invention is to relieve and solve poisoning of sulfur-containing substances to an oxygen electrode by a high-efficiency nondestructive method. According to the method, the poisoned oxygen electrode is placed in an environment containing NOx, the NOx is used for replacing poisoned substances adsorbed on the surface of an oxygen electrode electrocatalyst, and the NOx environment is a gaseous NOx environment or a liquid NOx environment; and electrochemical reduction reaction is carried out on the substituted and adsorbed oxygen electrode to finish regeneration of the oxygen electrode electrocatalyst. The regeneration method of the high-potential oxidation poisoning substance is converted into low-potential reduction regeneration, so that the poisoning influence of sulfur-containing gas in air impurities on the oxygen electrode electrocatalyst can be eliminated, and the influence of high-potential oxidation regeneration on the stabilityof the catalyst is avoided. The method is rapid and efficient.

Description

technical field [0001] The invention belongs to the field of electrocatalysis; in particular, it relates to a regeneration device and a regeneration method for eliminating the influence of air impurities on the poisoning of an oxygen electrode electrocatalyst. Background technique [0002] The oxygen electrode is a gas electrode capable of reducing oxygen, and is an important part of devices such as fuel cells, metal-air batteries, electrolyzed water, and hydrogen peroxide generators. For the sake of simple operation and cost saving, air is usually used as the reactant instead of oxygen in practical applications. There are a large number of poisonous species in the air that may greatly reduce the electrocatalytic activity and stability of the oxygen electrode, such as SO 2 , SO 3 , NO 2 , NO, H 2 S, CO, CO 2 , O 3 , small organic molecules (formic acid, methanol, ethanol, propylene, acetonitrile, methyl methacrylate, naphthalene, acetylene, etc.), metal ions, etc., the...

Claims

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Application Information

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IPC IPC(8): B01J38/04B01J38/10B01J38/48B01J38/64H01M8/008B01J27/28B01J23/96
CPCB01J38/04B01J38/48B01J38/10B01J38/64B01J27/28H01M8/008B01J23/96Y02W30/84
Inventor 尹鸽平刘玉鑫李凌峰杜磊孔凡鹏
Owner HARBIN INST OF TECH