Sodium ion supercapacitor based on carbon nanotubes

Abstract

A sodium-ion supercapacitor based on carbon nanotubes comprises: two working electrodes based on carbon nanotubes; a separator; and a sodium-ion electrolyte, wherein the separator is placed between the two working electrodes based on carbon nanotubes, and the two working electrodes based on carbon nanotubes and the separator are immersed in the sodium-ion electrolyte; the supercapacitor of the present invention has high electrochemical performance, excellent durability and reliability.

Claims

1. A sodium-ion supercapacitor based on carbon nanotubes, comprising: two working electrodes based on carbon nanotubes, each comprising: a first working electrode including a first region and a second region, the first region and the second region being disposed adjacent to each other, wherein... A plurality of carbon nanotube materials are attached to the first region; and a second working electrode includes a third region and a fourth region, the third region and the fourth region being disposed adjacent to each other, wherein a plurality of carbon nanotube materials are attached to the third region; wherein the first region and the fourth region are disposed correspondingly; a membrane; and a sodium ion electrolyte, wherein the membrane is placed between the two carbon nanotube-based working electrodes, and the two carbon nanotube-based working electrodes and the membrane are immersed in the sodium ion electrolyte.

2. The sodium-ion supercapacitor based on carbon nanotubes as described in claim 1, wherein, The second region is not attached with a plurality of the carbon nanotubes; or, the second region is also attached with a plurality of the carbon nanotubes, and the number of the plurality of the carbon nanotubes attached per unit area in the second region is less than the number of the plurality of the carbon nanotubes attached per unit area in the first region; and the fourth region is not attached with a plurality of the carbon nanotubes; or, the fourth region is also attached with a plurality of the carbon nanotubes, and the number of the plurality of the carbon nanotubes attached per unit area in the fourth region is less than the number of the plurality of the carbon nanotubes attached per unit area in the third region.

3. The sodium-ion supercapacitor based on carbon nanotubes as described in claim 1, wherein, The membrane is a fibrous electronic insulating material, including polypropylene membrane, glass fiber membrane, polyester fiber membrane, polyimide fiber membrane or nanofiber membrane.

4. The sodium-ion supercapacitor based on carbon nanotubes as described in claim 1, wherein, The sodium ion electrolyte contains aqueous solutions of sodium hydroxide, sodium chloride, sodium carbonate, sodium sulfate, sodium acetate, sodium phosphate, sodium perchlorate, or sodium nitrate.

5. The sodium-ion supercapacitor based on carbon nanotubes as described in claim 1, wherein, The concentration range of this sodium ion electrolyte is 0.5 M to 1.0 M.

6. The sodium-ion supercapacitor based on carbon nanotubes as described in claim 1, wherein, The working electrode based on carbon nanotubes comprises a plurality of carbon nanotube materials. The preparation method of the carbon nanotube materials includes: Step 1: providing a nano-scale intermetallic catalyst; Step 2: treating the nano-scale intermetallic catalyst with hydrogen gas at a first temperature for a first time, and then treating the nano-scale intermetallic catalyst with a passivation gas for a second time; and Step 3: contacting the carbon source gas with the nano-scale intermetallic catalyst at a second temperature for a third time to obtain the carbon nanotube materials.

7. The sodium-ion supercapacitor based on carbon nanotubes as described in claim 6, wherein, Step 2 is performed within a tubular device; the blunt gas includes helium, neon, argon, krypton, or xenon; and the carbon source gas includes carbon monoxide, carbon dioxide, methane, ethane, methanol, or acetic acid.

8. The sodium-ion supercapacitor based on carbon nanotubes as described in claim 6, wherein, The first temperature is 500~700℃, the first time is 50~70 minutes, the second time is 10~15 minutes, the second temperature is greater than or equal to the first temperature and less than 900℃, and the third time is 50~70 minutes.

9. The sodium-ion supercapacitor based on carbon nanotubes as described in claim 1, further comprising: A housing for accommodating the two carbon nanotube-based working electrodes, the diaphragm, and the sodium ion electrolyte; and two electrode terminals, which are respectively connected to the two carbon nanotube-based working electrodes and protrude from the housing.

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