FIELD: chemistry.
SUBSTANCE: invention relates to package (100', 100'') electrolysis cell for conversion of gaseous carbon dioxide (CO2) into at least one gas-phase product leaving package (100', 100'') electrolysis cell containing: end unit (26) on the cathode side with gas inlet (21), fluid inlet (23), fluid outlet (24) and an electrical outlet; end unit (27) on the anode side with gas outlet (22) and an electrical outlet; at least two electrolysis cells (40) located between end unit (26) on the cathode side and end unit (27) on the anode side, wherein each electrolysis cell (40) comprises: cathode current collector (5; 5a, 5b, 5c, 5d); anode current collector (10); membrane electrode assembly containing: ion-exchange membrane (7) with a first side and a second side, a cathode catalyst layer (6b) located on said first side in contact with membrane (7), gas diffusion layer (6a) on the cathode side, located on the cathode catalyst layer (6b) in contact with cathode catalyst (6b), anode catalyst layer (8b) located on said second side in contact with membrane (7), gas diffusion layer (8a) on anode side located on anode catalyst layer (8b) in contact with anode catalyst (8b); spacer element (9a, 9b) located between cathode current collector (5; 5a, 5b, 5c, 5d) and anode current collector (10), wherein said spacer element (9a, 9b) is configured to: fixing the membrane electrode assembly between the cathode current collector (5; 5a, 5b, 5c, 5d) and the anode current collector (10) in the position between the cathode current collector (5; 5a, 5b, 5c, 5d) and anode current collector (10), wherein: gas diffusion layer (6a) on cathode side is in partial contact with cathode current collector (5; 5a, 5b, 5c, 5d), thereby forming in-plane flow structure (5'') on cathode side between them, and gas diffusion layer (8a) on side of anode is in partial contact with anode current collector (10), thereby forming an intraplanar flow structure (5') on the anode side between them; cathode current collector compartment (5; 5a, 5b, 5c, 5d) and anode current collector (10) from each other; sealed continuous gas path of the cell passing between gas inlet (46) into the cell and gas outlet (47) from the cell within cell (40) through flow structure (5'') on cathode side; sealed continuous fluid path of the cell passing between fluid inlet (48) into the cell and fluid outlet (49) of the cell within cell (40) through flow structure (5') on the anode side; wherein the electrical terminal of end unit (26) on the cathode side, said at least two electrolysis cells (40) and the electrical terminal of end unit (27) on the anode side are electrically connected in series; and gas paths of electrolysis cells (40) with gas transfer channels (34, 35) passing between adjacent cells (40) through cathode current collector (5; 5a, 5b, 5c, 5d), spacer element (9a, 9b) and anode current collector (10) form a continuous gas path passing from gas inlet (21) to gas outlet (22) for supplying CO2 to each gas diffusion layer (6a) on the cathode side for conversion of CO2 into a gas-phase product by carrying out at least one cathodic electrolysis reaction in flow structure (5'') on the cathode side of each electrolysis cell (40) and for discharge of product through said gas outlet (22), and fluid paths of electrolysis cells (40) with channels (38, 39) for movement of fluid medium passing between adjacent cells (40) through cathode current collector (5; 5a, 5b, 5c, 5d), spacer element (9a, 9b) and anode current collector (10) form a continuous fluid path passing from fluid inlet (23) to fluid outlet (24) for supplying liquid anolyte to each flow structure (5') on anode side to perform said cathode electrolysis reaction, wherein at least one anodic electrolysis reaction takes place in flow structure (5') on the anode side of each electrolysis cell (40), and for discharging liquid-phase anolyte and one or more reaction products obtained during said anodic electrolysis reaction through said fluid outlet (24). Invention also relates to an electrolytic apparatus and a method for converting gaseous carbon dioxide.
EFFECT: use of the proposed invention enables to produce a product with the highest possible selectivity, and also to produce products that are easily amenable to separation.
24 cl, 8 ex, 24 dwg
