Production of Gas Diffusion Electrodes Comprising Ion Transport Resins for Electrochemical Reduction of CO2

• US 20200131649A1
• Filed: 02/15/2018
• Published: 04/30/2020
• Est. Priority Date: 03/13/2017
• Status: Active Application

• Current Assignee: Siemens Energy Global GmbH & Co. KG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: KRAUSE, Ralf, RELLER, Christian, SCHMID, Gunter, SCHMID, Bernhard, STEINBACHER, Frank
• Application Number:
  US16/493,230
• Publication Number:
  US 20200131649A1
• Time in Patent Office: Days
• CPC Class Codes: B01D 53/326 in electrochemical cells
• CPC Class Codes: C01B 3/50 Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification C01B3/14 takes precedence
• CPC Class Codes: C25B 1/00 Electrolytic production of inorganic compounds or non-metals
• CPC Class Codes: C25B 11/031 Porous electrodes
• CPC Class Codes: C25B 11/095 at least one of the compounds being organic
• CPC Class Codes: C25B 3/25 Reduction
• CPC Class Codes: C25B 9/00 Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
• CPC Class Codes: C25B 9/19 with diaphragms
• CPC Class Codes: C25B 9/23 comprising ion-exchange membranes in or on which electrode material is embedded

Abstract

Various embodiments include a gas diffusion electrode comprising: a metal M selected from the group consisting of: Ag, Au, Cu, and Pd; a binder; hydrophilic and hydrophobic pores and/or channels; and an anion transport material in the pores and/or channels.

Claims

1. A gas diffusion electrode comprising:

at least one metal M selected from the group consisting of;

Ag, Au, Cu, and Pd;

a binder;

hydrophilic and hydrophobic pores and/or channels; and

an anion transport material in the pores and/or channels.

2. The gas diffusion electrode as claimed in claim 1, wherein the anion transport material comprises a resin.

3. The gas diffusion electrode as claimed in claim 1, wherein the an ion transport material is disposed on a surface of the gas diffusion electrode.

4. The gas diffusion electrode as claimed in claim 1, wherein the anion transport material is stable at a pH of more than 7 and/or does not have any imidazolium, pyridinium, and/or β

-hydrogen-containing groups.

5. The gas diffusion electrode as claimed in claim 1, wherein the anion transport material includes quaternary alkylammonium groups.

6. The gas diffusion electrode as claimed in claim 1, wherein the anion transport material has been at least partly fluorinated.

7. The gas diffusion electrode as claimed in claim 1, wherein the anion transport material includes OH groups and/or NH₂ groups.

8. The gas diffusion electrode as claimed in claim 1, further comprising:

a carrier; and

a layer comprising the at least one metal M, the ion transport material, and the binder;

wherein a proportion by weight of the ion transport material in the layer is greater than the proportion by weight of the binder.

9. The gas diffusion electrode as claimed in claim 1, further comprising:

a carrier; and

a first layer comprising the at least one metal M, the ion transport material, and the binder; and

a second layer comprising the at least one metal M and a second binder;

wherein the second layer is disposed between the carrier and the first layer;

wherein the binder content in the first layer is less than in the second layer;

wherein the first layer and the second layer each comprise respective hydrophobic pores and/or channels;

wherein the second layer includes 3-30% by weight of the binder; and

wherein the first layer includes 0-10% by weight of the binder.

10. An electrolysis cell comprising:

an anode; and

a cathode comprising;

at least one metal M selected from the group consisting of;

Ag, Au, Cu, and Pd;

a binder;

hydrophilic and hydrophobic pores and/or channels; and

an anion transport material in the pores and/or channels.

11. The electrolysis cell as claimed in claim 10, further comprising a membrane and/or a diaphragm between the cathode and anode.

12. The electrolysis cell as claimed in claim 11, wherein an anion exchange membrane and/or an anion exchange diaphragm is not in contact with the anode.

13-14. -14. (canceled)

15. A process for producing a gas diffusion electrode comprising at least one metal M selected from the group consisting of Ag, Au, Cu, and Pd, a binder, hydrophilic and hydrophobic pores and/or channels, and an ion transport material disposed in at least some of the pores and/or channels, the process comprising:

mixing the at least one metal M, the ion transport material and the binder;

applying the resulting mixture to a carrier;

rolling the mixture onto the carrier to form a layer.

16. (canceled)

17. A process for producing a gas diffusion electrode comprising at least one metal M selected from the group consisting of Ag, Au, Cu, and Pd, a binder, hydrophilic and hydrophobic pores and/or channels, and an ion transport material disposed in at least some of the pores and/or channels, the process comprising:

mixing the at least one metal M, the ion transport material and the binder to form a first mixture;

mixing the metal M and a second binder to form a second mixture;

applying of the second mixture onto a carrier to form a layer;

applying the first mixture to the layer;

rolling the second and first mixture on the carrier.