US 12,305,301 B2
Carbon dioxide gas-phase reduction device and carbon dioxide gas-phase reduction method
Sayumi Sato, Musashino (JP); Yuya Uzumaki, Musashino (JP); Akihiro Kono, Musashino (JP); and Takeshi Komatsu, Musashino (JP)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (JP)
Appl. No. 18/555,415
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed May 25, 2021, PCT No. PCT/JP2021/019783
§ 371(c)(1), (2) Date Oct. 13, 2023,
PCT Pub. No. WO2022/249276, PCT Pub. Date Dec. 1, 2022.
Prior Publication US 2024/0124996 A1, Apr. 18, 2024
Int. Cl. C25B 3/21 (2021.01); C25B 3/03 (2021.01); C25B 3/07 (2021.01); C25B 3/26 (2021.01); C25B 9/19 (2021.01); C25B 9/50 (2021.01); C25B 11/049 (2021.01); C25B 15/023 (2021.01)
CPC C25B 15/023 (2021.01) [C25B 3/03 (2021.01); C25B 3/07 (2021.01); C25B 3/21 (2021.01); C25B 3/26 (2021.01); C25B 9/19 (2021.01); C25B 9/50 (2021.01); C25B 11/049 (2021.01)] 4 Claims
OG exemplary drawing
 
1. A gas phase reduction device for carbon dioxide that exerts a catalytic function by light irradiation to generate oxidation-reduction reaction, the gas phase reduction device for carbon dioxide comprising:
an oxidation tank in which an aqueous solution is put;
a reduction tank to which carbon dioxide is supplied;
a semiconductor photoelectrode installed in an aqueous solution in the oxidation tank;
a porous electrode-supported electrolyte membrane that is a joint body of an electrolyte membrane and a porous reduction electrode, the porous electrode-supported electrolyte membrane being installed between the oxidation tank and the reduction tank with the electrolyte membrane facing the oxidation tank and the porous reduction electrode facing the reduction tank;
a control unit that is electrically connected to the semiconductor photoelectrode and the porous reduction electrode and controls voltage between the semiconductor photoelectrode and the porous reduction electrode;
a first reference electrode installed in an aqueous solution in the oxidation tank;
a second reference electrode installed on the reduction tank side in contact with the electrolyte membrane; and
a voltmeter that measures voltage between the first reference electrode and the second reference electrode,
wherein the control unit increases voltage between the semiconductor photoelectrode and the porous reduction electrode in accordance with change in voltage between the first reference electrode and the second reference electrode from an initial value at start of reaction.