Environment control system utilizing an electrochemical cell
An environment control system utilizes oxygen and humidity control devices that are coupled with an enclosure to independently control the oxygen concentration and the humidity level within the enclosure. An oxygen depletion device may be an oxygen depletion electrolyzer cell that reacts with oxygen within the cell and produces water through electrochemical reactions. A desiccating device may be g, a dehumidification electrolyzer cell, a desiccator, a membrane desiccator or a condenser. A controller may control the amount of voltage and/or current provided to the oxygen depletion electrolyzer cell and therefore the rate of oxygen reduction and may control the amount of voltage and/or current provided to the dehumidification electrolyzer cell and therefore the rate of humidity reduction. The oxygen level may be determined by the measurement of voltage and a limiting current of the oxygen depletion electrolyzer cell. The enclosure may be a food or artifact enclosure.
1. A humidity control electrolyzer cell comprising;
a) an ion exchange medium;
b) an anode;
c) a cathode;
wherein the anode and cathode are configured on opposing sides of the ion exchange medium;
wherein the ion exchange medium comprises an anion conducting ionomer,
wherein the ion exchange medium is a discontinuous ionomer having a discontinuous ionomer layer;
wherein the discontinuous ionomer is configured between the anode and cathode; and
wherein the discontinuous ionomer has an anode ionomer layer, a cathode ionomer layer and a discontinuous layer configured between the anode ionomer layer and the cathode ionomer layer.
2. The humidity control electrolyzer cell of claim 1 , wherein the ion exchange medium comprises an anion conducting ionomer comprising quaternary ammonium functional groups.
3. The humidity control electrolyzer cell of claim 1 , wherein the discontinuous layer has a higher equivalent that the remaining portion of the discontinuous ionomer by at least 20%.
4. The humidity control electrolyzer cell of claim 1 , wherein the discontinuous ionomer layer has a higher equivalent that the remaining portion of the discontinuous ionomer by at least 35%.
5. The humidity control electrolyzer cell of claim 1 , wherein the discontinuous ionomer has thickness of no more than 50 microns.
6. The humidity control electrolyzer cell of claim 1 , wherein the anion conducting polymer comprises:
a backbone selected from the group consisting of: poly(arylene), poly(phenylene) and poly(styrene); and
an alkyl or piperidine side chain configured between a functional group and a backbone of the anion conducting polymer.
7. The humidity control electrolyzer cell of claim 1 , wherein the ion exchange medium is a composite ion exchange medium comprising a support material attached to the anion conducting polymer.
8. The environment control system of claim 7 , wherein the support material has a porosity of 55% to 90%.
9. The environment control system of claim 8 , wherein the support material comprises expanded polytetrafluoroethylene.
10. The humidity control electrolyzer cell of claim 1 , further comprising an air moving device configured to move moisture from the surface of the anode.
11. The humidity control electrolyzer cell of claim 1 , wherein the ion exchange medium comprises an anion conducting ionomer comprising phosphonium groups functional groups.
12. The humidity control electrolyzer cell of claim 11 , further comprising an air moving device configured to move moisture from the surface of the anode.
13. The humidity control electrolyzer cell of claim 1 , wherein the anion conducting polymer comprises alkyl or a piperidine side chain configured between a functional group and a backbone of the anion conducting polymer.
14. The humidity control electrolyzer cell of claim 13 , further comprising an air moving device configured to move moisture from the surface of the anode.