A kind of preparation method of sandwich structure carbon-based supercapacitor
A technology for supercapacitors and sandwiches, which is applied in the field of preparation of sandwich-structured carbon-based supercapacitors, and can solve the problems of low energy density of single carbon-based electric double layer capacitors
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Embodiment 1
[0038] This embodiment provides a method for preparing a sandwich-structured carbon-based supercapacitor, such as figure 1 As shown, it specifically includes the following steps:
[0039] 1. Preparation of positive plate
[0040] Add 10 mL of absolute ethanol, 1 mL of ammonia water (25% in mass concentration), and 40 mL of distilled water into a three-neck flask, and magnetically stir for 10 min to form a solution. With stirring, 1 mL of tetraethyl orthosilicate was added dropwise to the above solution, and magnetically stirred for 20 min. Finally, 4 mL of dopamine hydrochloride aqueous solution (concentration: 0.08 g / mL) was added to the above solution, and reacted for 20 hours under magnetic stirring. After the reaction, centrifuged, washed, and dried to obtain polydopamine@SiO 2 Microspheres.
[0041] Polydopamine@SiO 2 The microspheres were placed in an atmosphere furnace under the condition of nitrogen protection, and the nitrogen flow rate was 100 μL / min. From room te...
Embodiment 2
[0053] 1. Preparation of positive plate
[0054] Add 10 mL of absolute ethanol, 1 mL of ammonia water (25% in mass concentration), and 40 mL of distilled water into a three-neck flask, and magnetically stir for 10 min to form a solution. With stirring, 1 mL of tetraethyl orthosilicate was added dropwise to the above solution, and magnetically stirred for 20 min. Finally, 4 mL of dopamine hydrochloride aqueous solution (concentration: 0.1 g / mL) was added to the above solution, and reacted for 20 h under magnetic stirring. After the reaction, centrifuged, washed, and dried to obtain polydopamine@SiO 2 Microspheres.
[0055] Polydopamine@SiO 2 The microspheres were placed in an atmosphere furnace under the condition of nitrogen protection, and the nitrogen flow rate was 100 μL / min. From room temperature to 800 °C, the heating rate is 10 °C / min, and the temperature is kept at this temperature for 3 hours to obtain nitrogen-doped carbon @SiO 2 Microspheres. Nitrogen-doped carb...
Embodiment 3
[0066] 1. Preparation of positive plate
[0067] Add 10 mL of absolute ethanol, 1 mL of ammonia water (25% in mass concentration), and 40 mL of distilled water into a three-neck flask, and magnetically stir for 10 min to form a solution. With stirring, 1 mL of tetraethyl orthosilicate was added dropwise to the above solution, and magnetically stirred for 20 min. Finally, 4 mL of dopamine hydrochloride aqueous solution (concentration: 0.12 g / mL) was added to the above solution, and reacted for 20 h under magnetic stirring. After the reaction, centrifuged, washed, and dried to obtain polydopamine@SiO 2 Microspheres.
[0068] Polydopamine@SiO 2 The microspheres were placed in an atmosphere furnace under the condition of nitrogen protection, and the nitrogen flow rate was 100 μL / min. From room temperature to 800 °C, the heating rate is 10 °C / min, and the temperature is kept at this temperature for 3 hours to obtain nitrogen-doped carbon @SiO 2 Microspheres. Nitrogen-doped car...
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