Redox flow battery with carbon dioxide based redox couple
AssigneeAgora Energy Technologies Ltd.
InventorElod Lajos Gyenge
Life of this patent
Estimating the term…
Abstract
A redox flow battery where the negative electrode uses carbon dioxide based redox couples. The negative electrode contains a bifunctional catalyst that allows for the reduction of carbon dioxide to carbonaceous species (e.g., formic acid, oxalic acid or their salts) in the battery charge (i.e., energy storage) mode, and for the oxidation of the above-mentioned carbonaceous species in the battery discharge (i.e., energy generation) mode. The positive electrode of the battery can utilize a variety of redox couples including but not restricted to bromine-bromide, chlorine-chloride, vanadium (IV)-vanadium (V), chromium (III)-dichromate (VII), cerium (III)-cerium (IV), oxygen-water (or hydroxide).
Claims33
A redox flow battery, comprising:
- (a) a negative electrode comprising a carbon dioxide based redox couple and a bi-functional catalyst selected to reduce carbon dioxide to a carbonaceous derivative in an energy storage cycle and to oxidize the carbonaceous derivative to carbon dioxide in an energy generation cycle, wherein the reduction of carbon dioxide and the oxidation of the carbonaceous derivative occur on a same surface of the negative electrode;
- (b) a positive electrode containing a redox couple selected such that the equilibrium battery cell voltage for the energy generation cycle is a positive value;
- and
- (c) an ion conducting separator positioned to conduct ions between the negative and positive electrodes and to separate a negative electrode reactant at the negative electrode from a positive electrode reactant at the positive electrode.
Dependencies are inferred from the claim text.