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michka:research:microbial_fuel_cells [2014-09-03 09:35] – michka | michka:research:microbial_fuel_cells [2014-10-02 12:51] – michka | ||
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[[http:// | [[http:// | ||
- | ====Experiments==== | + | ===High-School Project Presentation=== |
- | ===One Container Design=== | + | [[http:// |
- | {{ : | + | ====Experiments==== |
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- | ==Results== | + | |
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- | * 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== | + | |
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- | * 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=== | + | |
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- | {{ :michka: | + | |
- | {{ : | + | |
- | {{ : | + | |
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- | * 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=== | + | |
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- | {{ :michka: | + | |
- | + | ||
- | * 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 Ideas==== | ====Design Improvements Ideas==== | ||
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* Does the efficiency drops if we use flat electrodes from dead batteries ? | * Does the efficiency drops if we use flat electrodes from dead batteries ? | ||
+ | |||
+ | ====Other kinds of batteries==== | ||
+ | |||
+ | * Molten salt batteries | ||
+ | * Donald Sadaway, TED | ||
+ | * Zebra battery | ||
+ | * Rhubarb battery |