Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision		 Previous revision
Next revisionBoth sides next revision
michka:research:microbial_fuel_cells [2014-07-11 10:38] – michkamichka:research:microbial_fuel_cells [2014-10-02 12:51] – michka
Line 17: Line 17:
 [[http://www.treehugger.com/slideshows/gadgets/make-microbial-fuel-cell/page/1/#slide-top|This design]] is made from one container, sludge at the bottom, smart gel proton exchanger on top of it, and clean water on the very top. No air pump, but lower performances. Something like charcoal is used as an electrode material. [[http://www.treehugger.com/slideshows/gadgets/make-microbial-fuel-cell/page/1/#slide-top|This design]] is made from one container, sludge at the bottom, smart gel proton exchanger on top of it, and clean water on the very top. No air pump, but lower performances. Something like charcoal is used as an electrode material.
  
-====Experiments====+===High-School Project Presentation===
  
-===One Container Design===+[[http://prezi.com/aw1kjprkgphz/tpe-comment-augmenter-et-utiliser-la-production-denergie-a-partir-dexcrement-de-cheval/|This is]] a presentation made by a group of students on low-tech horse-crap-based MFCs, with actual power figures in it (about 100mW for 120g of horsecrap).
  
-   * Wiring as electrode.+====Experiments====
  
-==Results== +   * [[michka:research:microbial_fuel_cells:Nantes1|Nantes1]] 
- +   * [[michka:research:microbial_fuel_cells:Bruxelles2|Bruxelles2]]
-   * 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. +
- +
-==Conclusion== +
- +
-   * Is paper a good PEM ? +
- +
-===Two Containers Design=== +
- +
-Hard-drive metal box as electrode material. +
- +
-===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====
Line 99: Line 42:
  
    * 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
  • michka/research/microbial_fuel_cells.txt
  • Last modified: 2018-04-26 12:44
  • by michka