Membrane-less electrolyzer

Patent metadata

Field	Value
Publication number	US-10907262-B2
Application number	US-201515520096-A
Country	US
Kind code	B2
Filing date	Oct 19, 2015
Priority date	Oct 20, 2014
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

The present invention concerns a membrane-less electrolyzer comprising a fluidic channel for receiving an electrolyte fluid; a first electrode and a second electrode located inside the fluidic channel, the first and second electrode permitting to extract a first gas and a second gas inside the fluidic channel from the electrolyte fluid, the first electrode and second electrode being separated by solely a surrounding fluid in the fluidic channel or the electrolyte; and a first fluidic transport channel for transporting the first gas to a first outlet and a second fluidic transport channel for transporting the second gas to a second outlet.

First claim

The invention claimed is:

1. A membrane-less electrolyzer comprising:
a fluidic channel including a first wall, a second wall, and a bottom floor that is in contact with the first and second walls and extending therebetween, the fluidic channel configured to receive and guide an electrolyte fluid;
a first electrode and a second electrode located inside the fluidic channel, the first and second electrode permitting to extract a first gas and a second gas inside the fluidic channel from the electrolyte fluid, the first electrode and second electrode being separated by a surrounding fluid in the fluidic channel or the electrolyte fluid;
an electrolyte inlet located upstream of the fluidic channel and configured to provide the electrolyte fluid to the fluidic channel;
a first outlet located downstream of the fluidic channel configured to receive the first gas and the electrolyte fluid; and
a second outlet located downstream of the fluidic channel configured to receive the second gas and the electrolyte fluid,
wherein the first wall extends to the first outlet to delimit the first outlet and the second wall extends to the second outlet to delimit the second outlet, the second outlet facing the first outlet such that an expelling direction of the first gas and the electrolyte fluid at the first outlet is different from an expelling direction of the second gas and the electrolyte fluid at the second outlet,
wherein the first and second electrodes each define continuous elongated electrodes extending both separately and side-by-side inside the fluidic channel, the first and second elongated electrodes each having a continuously exposed electrolysis surface, and
wherein the first and second electrodes are separated by an inter-electrode separation distance that lies in a range of 5 mm>d≥50 μm.

2. The membrane-less electrolyzer according to claim 1 , wherein the range is 500 μm≥d≥50 μm.

3. The membrane-less electrolyzer according to claim 1 , wherein the fluidic channel includes an enclosed fluidic channel.

4. The membrane-less electrolyzer according to claim 1 , further comprising:
a mechanism for guiding fluids configured to generate a force by a guided flow of the electrolyte fluid in the fluidic channel, the force acting on the first and second gas to confine the first and second gases to opposing sides of the fluidic channel.

5. The membrane-less electrolyzer according to claim 1 , wherein the the inter-electrode separation distance or the wall separation distance is configured to cause a laminar fluid flow of the electrolyte in the fluidic channel.

6. The membrane-less electrolyzer according to claim 5 , wherein the range is 200 μm>d>50 μm.

7. The membrane-less electrolyzer according to claim 1 , further comprising:
an electrolyte fluid insertion and removal system configured to generate a hyperbolic electrolyte flow profile across the fluidic channel from the first wall to the second wall.

8. The membrane-less electrolyzer according to claim 1 , wherein the membrane-less electrolyzer is planar or forms an in-plane membrane-less electrolyzer.

9. The membrane-less electrolyzer according to claim 1 , wherein the first electrode and the second electrode are located on the bottom floor of the fluidic channel.

10. The membrane-less electrolyzer according to claim 1 , wherein the first electrode and the second electrode are located on the first wall and the second wall, respectively, of the fluidic channel.

11. The membrane-less electrolyzer according to claim 1 , further comprising:
a first fluidic transport channel arranged between the fluidic channel and the first outlet, forming a part of the extended first wall; and
a second fluidic transport channel arranged between the fluidic channel and the second outlet, forming a part of the extended second wall,
wherein the first fluidic transport channel and the second fluidic transport channel include a plurality of microstructures located on a ceiling of the fluidic channel.

12. The membrane-less electrolyzer according to claim 1 , further comprising:
a first fluidic transport channel arranged between the fluidic channel and the first outlet, forming a part of the extended first wall; and
a second fluidic transport channel arranged between the fluidic channel and the second outlet, forming a part of the extended second wall,
wherein the first fluidic transport channel and the second fluidic transport channel include at least one of a plurality of micro-holes and a plurality of micro-conduits located on the ceiling of the fluidic channel permitting fluidic communication between the fluidic channel and the first and second fluidic transport channels.

13. The membrane-less electrolyzer according to claim 11 , further comprising:
a barrier to separate and guide the gases to the respective first and second outlets.

14. The membrane-less electrolyzer according to claim 11 , wherein the first electrode and the second electrode are located on the bottom floor of the fluidic channel or on the first wall and the second wall, respectively, of the fluidic channel.

15. The membrane-less electrolyzer according to claim 11 , further comprising:
a first sealed fluidic channel between the first outlet and the first fluidic transport channel, and a second sealed fluidic channel between the second outlet and the second fluidic transport channel.

16. A method of operating a membrane-less electrolyzer as recited in claim 1 ,
the method comprising the steps of:
inserting the electrolyte fluid into the membrane-less electrolyzer;
applying an electrolysis voltage to the first and second electrodes to produce the first and the second gas; and
circulating the electrolyte fluid through the fluidic channel to transport the first gas to the first gas outlet and to transport the second gas to the second gas outlet.

17. The method of claim 16 , further comprising the step of:
circulating the electrolyte fluid through the fluidic channel to provide a laminar fluid flow in the fluidic channel and a hyperbolic electrolyte flow profile across the fluidic channel between the first and the second side wall.

18. The method of claim 16 , further comprising the step of:
modifying a fluid velocity of the electrolyte fluid circulating in the membrane-less electrolyzer to confine the first and second gases to opposing sides of the fluidic channel.

19. A membrane-less electrolyzer comprising:
a fluidic channel including a first wall, a second wall, and a bottom floor that is in contact with the first and second walls and extending therebetween, the fluidic channel configured to receive and guide a reactant in a fluid;
a first electrode and a second electrode located inside the fluidic channel, the first and second electrode configured to produce an oxidation product and a reduction product inside the fluidic channel from a reactant in the fluid, the first electrode and second electrode being separated by a surrounding fluid in the fluidic channel or the reactant in the fluid;
an inlet located upstream of the fluidic channel and configured to provide the reactant in the fluid to the fluidic channel,
a first outlet located downstream of the fluidic channel configured to receive the first gas and the electrolyte fluid; and
a second outlet located downstream of the fluidic channel configured to receive the second gas and the electrolyte fluid,
wherein the first wall extends to the first outlet to delimit the first outlet and the second wall extends to the second outlet to delimit the second outlet, the sec

Assignees

• Ecole Polytechnique Fed Lausanne Epfl

Inventors

• Hosseini Hashemi Seyyed Mohammad
• Choi Jae-Woo
• Psaltis Demetri
• Modestino Miguel Antonio

Classifications

• C25B9/17 Primary

  Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof · CPC title

• C25B11/00

  Electrodes; Manufacture thereof not otherwise provided for · CPC title

• C25B15/08 Primary

  Supplying or removing reactants or electrolytes; Regeneration of electrolytes · CPC title

• C25B1/04

  by electrolysis of water · CPC title

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title