Fe-cr redox flow battery systems and methods for preparation of chromium-containing electrolyte therefor
AssigneeCougar Creek Technologies, LLC
InventorsLiyu Li, Qingtao Luo
Life of this patent
Estimating the term…
Abstract
A method for preparation of electrolyte for a redox flow battery includes reducing chromium ore using a carbon source to convert the chromium ore to an iron/chromium alloy with carbon particles; dissolving the iron/chromium alloy with carbon particles in sulfuric acid to form a first solution; adding calcium chloride or barium chloride to the first solution to produce a second solution including FeCl3 and CrCl3; and adding an acid to the second solution to form the electrolyte. Other methods can be used for preparing an electrolyte from chromium waste material.
Claims20
A method for preparation of electrolyte for a redox flow battery, the method comprising:
- dissolving chromium waste material in HCl or H2SO4 to generate an electrolyte comprising CrCl3 or Cr2(SO4)3 and at least one metal impurity, respectively;
- reducing the at least one metal impurity in the electrolyte using an electrode of the redox flow battery to form particles of the at least one metal impurity;
- collecting the particles of the at least one metal impurity;
- and
- removing the collected particles using a cleaning solution.
A method for hydrogen gas production, the method comprising:
- providing a redox flow battery, comprising an anolyte comprising chromium ions in solution, a catholyte comprising iron ions in solution, a first half-cell comprising a first electrode in contact with the anolyte, a second half-cell comprising a second electrode in contact with the catholyte, and a first separator separating the first half-cell from the second half-cell;
- coupling an electrolysis cell to the redox flow battery, the electrolysis cell comprising third and fourth electrodes and water;
- discharging the redox flow battery into the electrolysis cell to produce hydrogen gas by electrolysis of the water in the electrolysis cell;
- removing the hydrogen gas from the electrolysis cell;
- and
- storing the hydrogen gas in a container.
Dependencies are inferred from the claim text.