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michka:research:microbial_fuel_cells [2014-07-03 13:14] – nik | michka:research:microbial_fuel_cells [2014-09-03 09:35] – michka | ||
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- | ====Two containers + Air Pump Design==== | + | ====From Litterature==== |
+ | |||
+ | ===Two containers + Air Pump Design=== | ||
[[http:// | [[http:// | ||
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Performances: | Performances: | ||
- | ====One container Design==== | + | ===One container Design=== |
[[http:// | [[http:// | ||
- | ====Design Improvements==== | + | ====Experiments==== |
+ | |||
+ | ===One Container Design=== | ||
+ | |||
+ | {{ : | ||
+ | |||
+ | * Wiring as electrode. | ||
+ | |||
+ | ==Results== | ||
+ | |||
+ | * Peak voltage at 100mV, drops to 60, stable. | ||
+ | * Voltage changes with oxygenation - + 10 mV. | ||
+ | |||
+ | ===One Container in Crate Design=== | ||
+ | |||
+ | * Layed down the jar in a crate covered with a plastic bag and filled with water. | ||
+ | * Five times bigger cathode, made of wiring, and then replaced by a flattened aluminium can. | ||
+ | |||
+ | ==Why ?== | ||
+ | |||
+ | * Augemented cathode surface area & reduced water layer width for oxygen access. | ||
+ | |||
+ | ==Results== | ||
+ | |||
+ | * No improved voltage with bigger wiring cathode. | ||
+ | * Improved voltage (300 mV) with aluminium can cathode. | ||
+ | * When putting directly the multimeter cathode in water, we obtain 600 mV. | ||
+ | |||
+ | ==Conclusion== | ||
+ | |||
+ | * The geometry of the multimeter cathode may be better for voltage than the one made of wiring or aluminium can. However, surface area is necessary to obtain current. | ||
+ | |||
+ | ===Crate Paper Design=== | ||
+ | |||
+ | {{ : | ||
+ | {{ : | ||
+ | {{ : | ||
+ | |||
+ | |||
+ | * Flattened aluminium can as electrode. | ||
+ | * Thick paper sheet as PEM. | ||
+ | |||
+ | ==Why?== | ||
+ | |||
+ | * Reduced PEM width. | ||
+ | * Augmented electrode (both) surface area. | ||
+ | |||
+ | ==Results== | ||
+ | |||
+ | * Negative voltage when putting a rock on cathode to maintain it in water. | ||
+ | * No improved voltage by the new flat design. | ||
+ | * Still no current measurable, probably very low. | ||
+ | * The addition of coke drops (H+) at the cathode do not help current generation. | ||
+ | |||
+ | ==Conclusion== | ||
+ | |||
+ | * Is paper a good PEM ? | ||
+ | |||
+ | ===Two Containers Design=== | ||
+ | |||
+ | {{ : | ||
+ | |||
+ | * Two bottles | ||
+ | * Saline bridge made of rope dipped in salt solution & wrapped in tape. | ||
+ | * Hard-drive metal box as electrode material. | ||
+ | |||
+ | ==Results== | ||
+ | |||
+ | * The addition of coke drops (H+) at the cathode do not help current generation. | ||
+ | |||
+ | ===Other results=== | ||
+ | |||
+ | * Two multimeter electrodes directly in water: about 30 mV. | ||
+ | * One mutimeter electrode on aluminium can dipped in water, one directly in water: about 30 mV. | ||
+ | * If water is not clean, voltage increases up to 100 mV. | ||
+ | * Two multimeter electrodes in the mud: 10-80 mV depending on location. | ||
+ | |||
+ | ===Overall Conclusion=== | ||
+ | |||
+ | * Maybe it needs a longer period to get started - eating up all the oxygen around the anode. | ||
+ | * Maybe our PEMs are not good. | ||
+ | |||
+ | ====Design Improvements | ||
===Airpump=== | ===Airpump=== |