Hydrogen management in electrochemical systems
Systems, methods, and apparatus configured for the mitigation of hydrogen accumulation within electrochemical systems are generally described. The systems, methods, and apparatus described herein can be, according to certain embodiments, configured to be part of an electrochemical system in which hydrogen is generated (e.g., as a reaction byproduct).
1. An electrochemical system, comprising:
a housing comprising an interior volume in which a liquid electrolyte is directly exposed to a first electrode comprising an aluminum-based electrode active material and a second electrode, the interior volume comprising an outlet; and
a hydrogen-permeable medium that is not substantially permeable to the liquid electrolyte, the medium associated with the outlet and defining an interface between the interior volume of the housing and an environment external to the interior volume, wherein:
the first electrode is an anode; and
the second electrode is a cathode.
2. The electrochemical system of claim 1 , wherein the hydrogen-permeable medium is a layer associated with the outlet.
3. The electrochemical system of claim 1 , wherein the electrolyte is configured to surround the anode and the cathode uninhibited.
4. The electrochemical system of claim 3 , wherein the hydrogen-permeable membrane is a microporous membrane.
5. The electrochemical system of claim 1 , wherein the hydrogen-permeable medium is hydrophobic.
6. The electrochemical system of claim 1 , wherein the hydrogen-permeable medium is capable of performing forward-osmosis such that water from the environment external to the interior volume can be osmotically transported across the hydrogen-permeable medium into the interior volume.
7. The electrochemical system of claim 1 , wherein the electrochemical system comprises an aluminum-water electrochemical cell.
8. A method comprising at least partially submerging the housing of claim 1 into a water-containing liquid.
9. An electrochemical system, consisting essentially of:
a housing comprising an interior volume in which a liquid electrolyte is exposed to a first electrode and a second electrode, the interior volume comprising an outlet; and
a hydrogen-permeable medium that is not substantially permeable to the liquid electrolyte, the medium associated with the outlet and defining an interface between the interior volume of the housing and an environment external to the interior volume, wherein:
the first electrode is an anode;
the second electrode is a cathode;
a headspace within the interior volume; and
an external load connected to the cathode and the anode.