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michka:research:microbial_fuel_cells [2014-07-11 10:31] – michka | michka:research:microbial_fuel_cells [2014-09-03 09:35] – michka | ||
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===One Container Design=== | ===One Container Design=== | ||
+ | |||
+ | {{ : | ||
* Wiring as electrode. | * Wiring as electrode. | ||
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===One Container in Crate Design=== | ===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 ?== | ==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=== | ===Crate Paper Design=== | ||
+ | |||
+ | {{ : | ||
+ | {{ : | ||
+ | {{ : | ||
+ | |||
* Flattened aluminium can as electrode. | * Flattened aluminium can as electrode. | ||
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* Negative voltage when putting a rock on cathode to maintain it in water. | * 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 Containers Design=== | ||
- | Hard-drive metal box as electrode material. | + | {{ : |
+ | |||
+ | * Two bottles | ||
+ | * Saline bridge made of rope dipped in salt solution & wrapped in tape. | ||
+ | | ||
+ | |||
+ | ==Results== | ||
+ | |||
+ | * The addition of coke drops (H+) at the cathode do not help current generation. | ||
===Other results=== | ===Other results=== | ||
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* If water is not clean, voltage increases up to 100 mV. | * If water is not clean, voltage increases up to 100 mV. | ||
* Two multimeter electrodes in the mud: 10-80 mV depending on location. | * 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==== |