Method for preparing oxygen precipitation electrode based on three-dimensional porous graphene

An oxygen evolution electrode, three-dimensional porous technology, applied in electrodes, battery electrodes, circuits, etc., can solve the problems of hindering the commercial development of metal-air batteries, high oxygen evolution overpotential, and expensive electrodes, and achieve excellent oxygen evolution catalysis. The performance, the preparation method is simple, and the price is low.

Inactive Publication Date: 2014-07-16
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Iridium and its oxide electrodes are the traditional and most commonly used electrodes for oxygen evolution reaction. However, as a noble metal, iridium is expensive, has limited resources, and suffers serious performance loss during long-term operation, which hinders photolysis of water and metal-air Commercial development in fields such as batteries
In view of the serious shortcomings of iridium and its oxide electrodes, such as high price, limited resources, and serious performance loss during long-term operation, studies in recent years have found that some transition metal elements (such as manganese and nickel) oxide materials exhibit certain oxygen evolution properties. However, the transition metal oxide oxygen precipitation overpotential is usually high, the effect is not ideal, and the steps are cumbersome, making it difficult to achieve large-scale production

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  • Method for preparing oxygen precipitation electrode based on three-dimensional porous graphene
  • Method for preparing oxygen precipitation electrode based on three-dimensional porous graphene
  • Method for preparing oxygen precipitation electrode based on three-dimensional porous graphene

Examples

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Embodiment 1

[0027] The preparation method of the oxygen evolution electrode based on three-dimensional porous graphene of the present embodiment comprises the following steps:

[0028] 1) Use concentrated sulfuric acid, sodium nitrate and potassium permanganate to oxidize graphite powder to prepare graphite oxide;

[0029] 2) Dry the graphite oxide prepared in step 1) in vacuum at 80°C for 20 hours;

[0030] 3) Grinding the dried graphite oxide obtained in step 2), and then heat-treating at 100°C for 12 hours under vacuum;

[0031] 4) The graphite oxide in step 3) is rapidly heated to 200°C at a rate of 2°C / s under a vacuum of about 0.0088Pa and kept for 10min. The obtained product is an oxygen evolution electrode based on three-dimensional porous graphene .

[0032] figure 1 The scanning electron microscope image of the three-dimensional porous graphene electrode prepared for Example 1; three-dimensional graphene with a porous structure can be clearly seen from the figure.

[0033] ...

Embodiment 2

[0037] The preparation method of the oxygen evolution electrode based on three-dimensional porous graphene of the present embodiment comprises the following steps:

[0038] 1) Use concentrated sulfuric acid, sodium nitrate and potassium permanganate to oxidize graphite powder to prepare graphite oxide;

[0039] 2) The graphite oxide prepared in step 1) was vacuum-dried at 60°C for 24 hours;

[0040] 3) Grinding the dried graphite oxide obtained in step 2), and then heat-treating at 80°C for 16h under vacuum;

[0041] 4) The graphite oxide in step 3) is rapidly heated to 180°C at a rate of 3°C / s under a vacuum of about 0.012Pa and kept for 30min. The obtained product is an oxygen evolution electrode based on three-dimensional porous graphene .

[0042] Figure 4 The scanning electron microscope image of the three-dimensional porous graphene electrode prepared for Example 2; three-dimensional graphene with a porous structure can be clearly seen from the figure.

[0043] Fi...

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Abstract

The invention discloses a method for preparing oxygen precipitation electrode based on three-dimensional porous grapheme. The method includes the following steps: 1) oxidizing graphite powder to prepare a graphite oxide; 2) carrying out vacuum drying on the graphite oxide prepared in step 1) at 60-80 DEG C; 3) carrying out heat treatment on the dried graphite oxide prepared in step 2) in vacuum at 80-120 DEG C for 8-24 hours; 4) heating the graphite oxide in step 3) in vacuum to 180-250 DEG C in vacuum and keeping for 5-60 minutes. The oxygen precipitation electrode based on three-dimensional porous grapheme prepared by the method disclosed by the invention has excellent catalytic performance of oxygen precipitation and good long term stability, can be used for replacing costly iridium and an oxide electrode thereof, is widely applied in fields such as photocatalytic water splitting and metal-air battery as well as other energy source converting devices, and has a high practical value, and the raw material of the oxygen precipitation electrode disclosed by the invention is common graphite powder, so that the oxygen precipitation electrode is wide in raw material source, low in cost, simple in preparation method and suitable for mass production.

Description

technical field [0001] The invention relates to a preparation method of an oxygen evolution electrode, in particular to a preparation method of an oxygen evolution electrode based on three-dimensional porous graphene. Background technique [0002] Oxygen evolution reaction is one of the most important electrocatalytic reactions, widely used in photolysis of water and metal-air batteries and other fields. Iridium and its oxide electrodes are the traditional and most commonly used electrodes for oxygen evolution reaction. However, as a noble metal, iridium is expensive, has limited resources, and suffers serious performance loss during long-term operation, which hinders photolysis of water and metal-air Commercial development in fields such as batteries. In view of the serious shortcomings of iridium and its oxide electrodes, such as high price, limited resources, and serious performance loss during long-term operation, studies in recent years have found that some transition ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/48
CPCC25B11/031C25B11/043H01M4/88H01M4/9091H01M4/96Y02E60/50
Inventor 李长明张连营赵志亮
Owner SOUTHWEST UNIVERSITY
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