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.
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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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