Granted Patent B2

US 12,297,552 · App. 18/299,672 · Granted May 13, 2025

Inventors: Kendra P. Kuhl (Oakland, CA); Etosha R. Cave (Berkeley, CA); George Leonard (Oakland, CA)

Assignee: Twelve Benefit Corporation

C25B9/23C25B3/25C25B3/26C25B11/051C25B11/057C25B13/02C25B13/08

Abstract

Claims (39)

1. A membrane electrode assembly comprising:

a cathode layer comprising a reduction catalyst and a first anion-conducting polymer;

an anode layer comprising an oxidation catalyst and a first cation-conducting polymer;

a membrane layer comprising a second cation-conducting polymer, the membrane layer arranged between the cathode layer and the anode layer, the membrane layer conductively connecting the cathode layer and the anode layer; and

a cathode buffer layer comprising a second anion-conducting polymer, wherein the cathode buffer layer is arranged between the cathode layer and the membrane layer and conductively connects the cathode layer and the membrane layer, wherein the cathode buffer layer is porous such that gas can be transported in the cathode buffer layer and wherein the membrane layer is non-porous such that gas is prevented from passing between the cathode layer and the anode layer.

2. The membrane electrode assembly of claim 1 , further comprising an anode buffer layer, comprising a third cation-conducting polymer, arranged between the membrane layer and the anode layer.

3. The membrane electrode assembly of claim 2 , wherein the second and third cation-conducting polymers comprise a perfluorosulfonic acid (PFSA) polymer.

4. The membrane electrode assembly of claim 2 , wherein the cathode buffer layer further comprises inert filler particles, wherein the first porosity is formed by the inert filler particles.

5. The membrane electrode assembly of claim 4 , wherein the inert filler particles comprise at least one of diamond particles, boron-doped diamond particles, polyvinylidene difluoride (PVDF) particles, and polytetrafluoroethylene (PTFE) particles.

6. The membrane electrode assembly of claim 4 , wherein a size of each of the inert filler particles is between about 10 nanometers and about 200 nanometers.

7. The membrane electrode assembly of claim 2 , wherein the second anion-conducting polymer is selected from a group consisting of Sustainion, FumaSep FAA-3, and Tokuyama anion exchange polymer.

8. The membrane electrode assembly of claim 1 , wherein the first and second anion-conducting polymers comprise Sustainion.

9. The membrane electrode assembly of claim 1 , wherein the cathode layer comprises a reduction catalyst composition comprising a first catalyst particle supported on the electronically conductive support; and a second catalyst particle supported on the electronically conductive support, wherein the first catalyst particle and the second catalyst particle are different materials, and wherein the first catalyst particle and the second particle catalyze CO x reduction.

10. The membrane electrode assembly of claim 9 , wherein the first catalyst particle and the second catalyst particle have different morphologies.

11. The membrane electrode assembly of claim 9 , wherein the first catalyst particle is selected from one of V, Cr, Mn, Fe, Co, Ni, Cu, Sn, Zr, Nb, Mo, Au, Ru, Rh, Pd, Ag, Cd, Hf, Ta, W, Re, Ir, Pt, Hg, Al, Si, In, Ga, TI, Pb, Bi, Sb, Te, Sm, Tb, Ce, and Nd.

12. The membrane electrode assembly of claim 11 , wherein the second catalyst particle is selected from a different one of V, Cr, Mn, Fe, Co, Ni, Cu, Sn, Zr, Nb, Mo, Au, Ru, Rh, Pd, Ag, Cd, Hf, Ta, W, Re, Ir, Pt, Hg, Al, Si, In, Ga, TI, Pb, Bi, Sb, Te, Sm, Tb, Ce, and Nd.

13. The membrane electrode assembly of claim 12 , wherein the first catalyst particle is gold and the second catalyst particle is copper.

14. The membrane electrode assembly of claim 9 , further comprising one or more additional catalyst particles of the same material as the first catalyst particle.

15. The membrane electrode assembly of claim 14 , further comprising one or more additional catalyst particles of the same material as the second catalyst particle.

16. A CO x reduction reactor comprising:

a membrane electrode assembly, the membrane electrode assembly comprising

a cathode layer comprising a reduction catalyst;

an anode layer comprising an oxidation catalyst, wherein the oxidation catalyst is configured for a hydrogen oxidation reaction;

a membrane layer comprising a cation-conducting polymer, the membrane layer arranged between the cathode layer and the anode layer, the membrane layer conductively connecting the cathode layer and the anode layer; and

a cathode buffer layer comprising an anion-conducting polymer, wherein the cathode buffer layer is arranged between the cathode layer and the membrane layer and conductively connects the cathode layer and the membrane layer, wherein the cathode buffer layer is porous such that gas can be transported in the cathode buffer layer and wherein the membrane layer is non-porous such that gas is prevented from passing between the cathode layer and the anode layer;

a cathode manifold coupled to the cathode layer;

a hydrogen (H 2 ) source; and

an anode manifold coupled to the anode layer, wherein the anode manifold is configured to distribute H 2 from the H 2 source to the anode layer.

17. The CO x reduction reactor of claim 16 , wherein the cathode manifold comprises a cathode support structure adjacent to the cathode layer, the cathode support structure comprising:

a cathode polar plate;

a cathode gas diffusion layer arranged between the cathode polar plate and the cathode layer;

a first inlet fluidly connected to the cathode gas diffusion layer; and

a first outlet fluidly connected to the cathode gas diffusion layer; and

wherein the anode manifold comprises an anode support structure adjacent to the anode layer, the anode support structure comprising:

an anode polar plate;

an anode gas diffusion layer arranged between the anode polar plate and the anode layer;

a second inlet fluidly connected to the anode gas diffusion layer; and

a second outlet fluidly connected to the anode gas diffusion layer.

18. The COx reduction reactor of claim 16 , wherein the cation-conducting polymer is selected from the group consisting of: Nafion 324, Nafion 350, Nafion 417, Nafion 424, Nafion 438, Nafion 450, Nafion 521, and Nafion 551.

Assignments (1)

Continuity (4)

References Cited (239)