Preparation method of self-supported three-dimensional graphene
A graphene, self-supporting technology, applied in the field of preparation of self-supporting three-dimensional graphene, can solve the problems of waste of resources, complicated preparation process, environmental pollution, etc., and achieve good foaming effect, improved current transmission capacity, and improved performance. Effect
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Embodiment 1
[0020] Using hexamethylenetetramine as a foaming agent and glucose as a carbon source to prepare three-dimensional graphene, the first step is to mix hexamethylenetetramine and glucose, stir into a uniform powder, and the second step is to heat up to a specified temperature and keep it for a certain period of time to prepare Self-supporting three-dimensional graphene foam.
[0021] Step 1. Mix glucose and hexamethylenetetramine at a mass ratio of 1:0.5.
[0022] Step 3. Under an inert atmosphere, heat the mixed powder to 1000°C at 4°C / min, and keep it warm for 0.5h;
[0023] Step 4, after the reaction is finished, take out the sample.
[0024] The samples were characterized by SEM and EDS as figure 1 , 2 shown. The results show that, according to the process parameters of Example 1, a three-dimensional graphene with a pore diameter of about 100 um, good light transmission, and self-supported by a carbon skeleton can be obtained.
Embodiment 2
[0026] Three-dimensional graphene is prepared by using hexamethylenetetramine as a foaming agent. The first step is to mix the carbon source and the foaming agent, and the second step is to raise the temperature to a specified temperature and keep it for a certain period of time to prepare a self-supporting three-dimensional graphene foam.
[0027] Step 1, mix glucose and hexamethylenetetramine with a mass ratio of 1:1, and place in the furnace body;
[0028] Step 2. Under an inert atmosphere, heat the powder at 8°C / min to 1200°C and keep it warm for 2 hours;
[0029] Step 3, the reaction furnace is cooled to room temperature, and after the reaction is completed, the sample is taken out.
[0030] The samples were characterized by SEM and EDS as in case 1.
Embodiment 3
[0032] Three-dimensional graphene is prepared by using hexamethylenetetramine as a foaming agent. The first step is to mix the carbon source and the foaming agent, and the second step is to raise the temperature to a specified temperature and keep it for a certain period of time to prepare a self-supporting three-dimensional graphene foam.
[0033] Step 1, mix glucose and hexamethylenetetramine with a mass ratio of 1:2, and place in the furnace body;
[0034] Step 2. Under an inert atmosphere, heat the powder at 10°C / min to 1400°C and keep it warm for 5 hours;
[0035] Step 3, the reaction furnace is cooled to room temperature, and after the reaction is completed, the sample is taken out.
[0036] The samples were characterized by SEM and EDS as in case 1.
[0037] The invention adopts a chemical foaming method and uses small nitrogen-containing organic molecules as a foaming agent to prepare nitrogen-doped three-dimensional graphene. Compared with the original plan using am...
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