Carbon Dioxide Capture Method for Coupled Staged Electrolysis/Pyrolysis Hydrogen Production

A carbon dioxide capture method for coupled staged electrolysis/pyrolysis hydrogen production, the carbon dioxide capture method for coupled staged electrolysis/pyrolysis hydrogen production comprising:

• capturing carbon dioxide in a target component by using an alkaline solution, and obtaining a carbonate-containing aqueous solution;
• enabling the carbonate-containing aqueous solution to be subjected to mild electrolysis, obtaining a hydroxide solution and hydrogen at a cathode, and obtaining a bicarbonate solution, and a mixed gas of oxygen and carbon dioxide at an anode;
• absorbing the carbon dioxide in the target component by using the hydroxide solution as a capture agent in a capture step;
• enabling the mixed gas of the oxygen and the carbon dioxide to pass through a tail gas absorption tower to absorb the carbon dioxide to obtain pure oxygen;
• pyrolyzing the bicarbonate solution to obtain pure carbon dioxide pyrolysis gas.