Electroosmotic pump
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An electroosmotic pump , or EO pump, is used for removing liquid flooding water from channels and gas diffusion layers and direct hydration of the proton exchange membrane in proton exchange membrane fuel cells[1].
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[edit] Principle
Electroosmotic pumps are fabricated from silica nanospheres[2][3] or hydrophilic porous glass, the pumping mechanism is generated by an external electric field applied on an electric double layer (EDL), generates high pressures (more than 340 atm (34 MPa) at 12 kV applied potentials) and high flow rates (e.g., 40 ml/min at 100 V in a pumping structure less than 1 cm³ in volume). EO pumps are compact, have no moving parts, and scale favorably with fuel cell design. The EO pump might drop the parasitic load of water management in fuel cells from 20% to 0.5% of the fuel cell power[4].
[edit] Types
[edit] Cascade electroosmotic pump
High pressures and flow rates are obtained by positioning several regular electroosmotic pumps parallel to each other in a cascade[5].
[edit] Porous electroosmotic pump
Porous pumping is created by the use of sintered glass[6].
[edit] Planar shallow electroosmotic pump
Planar shallow electroosmotic pumps are made of parallel shallow microchannels[7].
