Adsorption and release device of carbon dioxide
View Patent ↗An object of the present invention is to provide a carbon dioxide adsorption and release device, which has high adsorptivity, and also consumes low energy upon adsorption and desorption. The carbon dioxide adsorption and release device is characterized by including a pair of electrodes (electrode 1 and electrode 2 ) provided opposite to each other; an electrolyte 3 filled between the respective electrodes 1 and 2 of the pair of electrodes; and a porous body 4 provided on the electrode 1 of the pair of electrodes, wherein the electrolyte 3 absorbs carbon dioxide thereby dissolving the carbon dioxide therein, and thus enabling formation of carbonic acid ions or hydrogen carbonate ions; and the carbonic acid ions or hydrogen carbonate ions are electrostatically adsorbed on a surface of the porous body 4 when a forward voltage is applied to the pair of electrodes by the porous body 4 , and the carbonic acid ions or hydrogen carbonate ions are electrostatically released from a surface of the porous body 4 when a backward voltage is applied to the pair of electrodes.
1. A carbon dioxide adsorption and release device, comprising:
first and second electrodes provided opposite to each other;
an electrolyte, comprising a solvent that dissolves carbon dioxide into carbonic ions or hydrogen carbonate ions, filled between the first and second electrodes; and
a porous body, throughout which the solvent is present, provided on one of the first and second electrodes.
2. The carbon dioxide adsorption and release device according to claim 1 , wherein the porous body includes a unit A which is reversibly oxidizable and reducible by application of a voltage to a pair of electrodes, and either of an oxidation state and a reduction state of the unit A is an organic polymer which can be converted to a cationic state.
3. The carbon dioxide adsorption and release device according to claim 2 , wherein the porous body is a polymer gel which swells in the electrolyte.
4. The carbon dioxide adsorption and release device according to claim 3 , wherein, in the porous body, the unit A is represented by the following structural formula:
5. The carbon dioxide adsorption and release device according to claim 4 , wherein the porous body is represented by the following structural formula:
6. The carbon dioxide adsorption and release device according to claim 2 , wherein the porous body is a conductive polymer porous body.
7. The carbon dioxide adsorption and release device according to claim 6 , wherein, in the porous body, the unit A is polyaniline represented by the following structure formula:
8. The carbon dioxide adsorption and release device according to claim 1 , wherein the porous body is a conductive inorganic porous body.
9. The carbon dioxide adsorption and release device according to claim 8 , wherein the conductive inorganic porous body is at least one selected from the group consisting of a graphite, a carbon nanotube, and a carbon fiber.
10. The carbon dioxide adsorption and release device according to claim 2 , wherein the unit A included in the porous body has a density of 0.0002 mol/g to 0.02 mol/g.
11. The carbon dioxide adsorption and release device according to claim 1 , wherein a solvent of the electrolyte is water.
12. The carbon dioxide adsorption and release device according to claim 1 , wherein the electrolyte contains a supporting electrolyte salt.
13. The carbon dioxide adsorption and release device according to claim 12 , wherein a cation of the supporting electrolyte salt has a molecular weight of 1,000 or more.
14. The carbon dioxide adsorption and release device according to claim 12 , wherein an anion of the supporting electrolyte salt has a molecular weight of 1,000 or more.