A silicon-embedded redox graphene/graphite phase carbon nitride composite material and its preparation and application
A technology of graphitic carbon nitride and composite materials, which is applied in the fields of nanotechnology, electrochemical generator, nanotechnology for materials and surface science, and can solve the problem of increasing graphene/carbon nitride sheet spacing, chemical problems such as poor stability and poor conductivity, to achieve the effect of improving electrochemical activity, reducing reactivity, and high rate performance
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Embodiment 1
[0045] A method for preparing a silicon-embedded redox graphene / graphite phase carbon nitride composite material comprises the following steps:
[0046] S1. Add 5 g of urea and 0.5 g of graphene oxide into 100 mL of alcohol / water mixed solution (the volume ratio of ethanol: water is 1:2), and stir until all the liquid is volatilized to obtain a uniform mixture of urea / graphene oxide;
[0047] S2. Move the mixture of 5.5 g of urea / graphene oxide obtained in step S1 into a tube furnace fed with argon / hydrogen standard gas, raise the temperature to 550° C. at a heating rate of 10° C. / min, and heat it for 2 hours. Cool to room temperature, the product obtained by the reaction is redox graphene / graphite phase carbon nitride composite matrix;
[0048] S3, adding 0.1g of dodecyltrimethylammonium bromide to 200mL of deionized water, and configuring dodecyltrimethylammonium bromide / water mixed solution (0.5g / L) for subsequent use;
[0049] S4, 2.0g silicon powder (average particle siz...
Embodiment 2
[0057] A method for preparing a silicon-embedded redox graphene / graphite phase carbon nitride composite material comprises the following steps:
[0058] S1. Add 5g of urea and 0.5g of graphene oxide into 50mL of alcohol / water mixed solution (volume ratio of ethanol: water is 1:1), and stir until all the liquid is volatilized to obtain a uniform mixture of urea / graphene oxide;
[0059] S2. Move the 5.5g urea / graphene oxide mixture obtained in step S1 into a tube furnace fed with argon / hydrogen standard gas, raise the temperature to 650°C at a heating rate of 20°C / min, and heat it for 0.5 hours. Cool to room temperature, the product obtained by the reaction is redox graphene / graphite phase carbon nitride composite matrix;
[0060] S3, adding 0.2g of dodecyltrimethylammonium bromide to 200mL of deionized water, and configuring dodecyltrimethylammonium bromide / water mixed solution (1.0g / L) for subsequent use;
[0061] S4, 0.7g silicon powder (average particle size is 40nm) is add...
Embodiment 3
[0066] A method for preparing a silicon-embedded redox graphene / graphite phase carbon nitride composite material comprises the following steps:
[0067] S1. Add 10g of urea and 0.4g of graphene oxide into 50mL of alcohol / water mixed solution (the volume ratio of ethanol:water is 1:4), and stir until all the liquid is volatilized to obtain a uniform mixture of urea / graphene oxide;
[0068] S2. Move the 10.4g urea / graphene oxide mixture obtained in step (1) into a tube furnace fed with argon / hydrogen standard gas, heat up to 650°C at a heating rate of 2°C / min, and keep it warm for 4 hours , furnace cooled to room temperature. The product obtained by the reaction is the redox graphene / graphite phase carbon nitride composite material.
[0069] S3. Add 0.02 g of polydiallyldimethylammonium chloride into 200 mL of deionized water, and prepare a polydiallyldimethylammonium chloride / water mixed solution (0.1 g / L) for later use.
[0070] S4, 1.0g silicon powder (average particle size...
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