IP Library › Granted Patent US 12,239,941
Granted Patent B2
US 12,239,941 · App. 17/357,155 · Granted Mar 4, 2025

System for redox shuttle solution monitoring

Inventor: Eugene S. Beh (Palo Alto, CA)
Assignee: Xerox Corporation
B01D61/54B01D53/263B01D61/422B01D61/46B01D61/463B01D61/48C02F1/008C02F1/4693C02F1/4695F24F3/1417C02F2303/16
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Quick Facts
Patent No.
US 12,239,941
App. No.
17/357,155
Granted
Mar 4, 2025
Kind
B2
Abstract

An electrodialysis apparatus comprises a first reservoir wherein salt dissolved in solvent is reduced below a threshold concentration and a second reservoir wherein the salt concentration increases. A first electrode contacts a first solution of a first redox-active electrolyte material, and a second electrode contacts a second solution of a second redox-active electrolyte material. A first type of membrane is disposed between the first and second reservoirs and a second type of membrane is disposed between the first electrode and the first reservoir and between the second electrode and the second reservoir. A color measuring device is coupled to at least one of the solutions, and a control system is configured to modify the value of a property of at least one of the first and second solutions in response to detecting a color value of one of the solutions exceeding a threshold color value.

Claims (17)

1. An electrodialysis apparatus, comprising:

a first reservoir comprising an input and an output, wherein concentration of salt dissolved in solvent in the first reservoir is reduced below a threshold concentration during an operation mode;

a second reservoir comprising an input and an output, wherein concentration of salt dissolved in the solvent in the second reservoir increases in concentration during the operation mode;

a first electrode in contact with a first solution of a first redox-active electrolyte material having at least one property having a first value, wherein the first electrode is configured to have a reversible redox reaction with the first redox-active electrolyte material;

a second electrode in contact with a second solution of a second redox-active electrolyte material having at least one property having a second value, wherein the second electrode is configured to have a reversible redox reaction with the second redox-active electrolyte material;

a first type of membrane disposed between the first and second reservoirs;

a second type of membrane, different from the first type, disposed between the first electrode and the first reservoir and disposed between the second electrode and the second reservoir;

a color measuring device coupled to at least one of the first solution and the second solution for detecting a color value of the first solution or the second solution; and

a control system configured to modify the value of the at least one property of the first solution or the second solution in response to the color measuring device detecting a color value of the first solution or the second solution exceeding a threshold color value, wherein the at least one property of the first solution or the second solution is state of charge (SOC).

2. The electrodialysis apparatus of claim 1 , further comprising an electrical energy source coupled to the first and second electrodes and the control system is coupled to the electrical energy source and configured to control the energy source to apply a pulse at a predetermined potential between the first and second electrodes in response to the color measuring device detecting a color value of the first solution or the second solution exceeding a threshold color value to modify the at least one property.

3. The electrodialysis apparatus of claim 1 , wherein at least one of the first solution and the second solution is one or both of ferrocyanide and ferricyanide.

4. The electrodialysis apparatus of claim 1 , wherein at least one of the first solution and the second solution is [BTMAP-Fc] 2+/3+ .

5. The electrodialysis apparatus of claim 1 , wherein the color measuring device is a colorimeter.

6. The electrodialysis apparatus of claim 1 , wherein the color measuring device is a spectrophotometer.

7. The electrodialysis apparatus of claim 1 , wherein the threshold color value indicates a pH below 7.

8. The electrodialysis apparatus of claim 1 , wherein the threshold color value indicates a pH above 9.

9. The electrodialysis apparatus of claim 1 , wherein the first solution and the second solution form a single redox shuttle cycled between the first and second electrodes.

Assignments (8)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 6, 2026
From: XEROX CORPORATION
To: GENESEE VALLEY INNOVATIONS, LLC
Reel/Frame 075020/0755 →
SECOND LIEN NOTES PATENT SECURITY AGREEMENT Recorded Jul 2, 2025
From: XEROX CORPORATION
To: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, AS COLLATERAL AGENT
Reel/Frame 071785/0550 →
FIRST LIEN NOTES PATENT SECURITY AGREEMENT Recorded Apr 11, 2025
From: XEROX CORPORATION
To: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, AS COLLATERAL AGENT
Reel/Frame 070824/0001 →
SECURITY INTEREST Recorded Feb 13, 2024
From: XEROX CORPORATION
To: CITIBANK, N.A., AS COLLATERAL AGENT
Reel/Frame 066741/0001 →
SECURITY INTEREST Recorded Nov 20, 2023
From: XEROX CORPORATION
To: JEFFERIES FINANCE LLC, AS COLLATERAL AGENT
Reel/Frame 065628/0019 →
CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVAL OF US PATENTS 9356603, 10026651, 10626048 AND INCLUSION OF US PATENT 7167871 PREVIOUSLY RECORDED ON REEL 064038 FRAME 0001. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Recorded Jun 28, 2023
From: PALO ALTO RESEARCH CENTER INCORPORATED
To: XEROX CORPORATION
Reel/Frame 064161/0001 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 20, 2023
From: PALO ALTO RESEARCH CENTER INCORPORATED
To: XEROX CORPORATION
Reel/Frame 064038/0001 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 24, 2021
From: BEH, EUGENE S.
To: PALO ALTO RESEARCH CENTER INCORPORATED
Reel/Frame 056676/0143 →
Continuity (1)
Related Publication 20220410070A1 · Dec 29, 2022
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