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michka:research:microbial_fuel_cells:marseille3 [2014-10-01 16:14] – created michkamichka:research:microbial_fuel_cells:marseille3 [2014-10-08 14:39] (current) – michka
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 ====Experiment "Marseille3"==== ====Experiment "Marseille3"====
 +
 +These experiments have been conducted during the open workshops of the [[http://reso-nance.org/whattheflok/accueil|What the Flok ?]] festival taking place in Marseille, from Septembre 29th to October 4th.
  
 ====Crate Design #1==== ====Crate Design #1====
  
-Design features: +__Design features__ 
-   * Substrate: topsoil gathered from La Friche's garden - two days before assembly - inoculated with 10 mL of clay gathered in Niolon on the day of assembly. + 
-   * Container: crate, covered with a transparent garbage plastic bag. +{{ :michka:research:microbial_fuel_cells:dscf6377.jpg?300 |Clay Sampling Location - Niolon, France}} 
-   * Proton Exchange Membrane: printer paper with low amount of ink. +//Clay sampling spot - Niolon, France.// 
-   * Water comes from La Friche's tap - maybe chlorinated. + 
-   * Anode: copper covered with carbon, extracted from a dead DELL PC battery found in the LFO storage space.+ 
 +   * **Substrate**: topsoil gathered from La Friche's garden - two days before assembly - inoculated with 10 mL of clay gathered in Niolon (picture above) on the day of assembly. 
 +     * Volume: 80*30*2 cm3 
 +   * **Container**: crate, covered with a transparent garbage plastic bag. 
 +   * **Proton Exchange Membrane**: printer paper with low amount of ink. 
 +     * Surface: 80*30 cm2 
 +   * **Water** comes from La Friche's tap - maybe chlorinated. 
 +   * **Anode**: copper covered with carbon, extracted from a dead DELL PC battery found in the LFO storage space.
      * Surface: 70*5 cm2      * Surface: 70*5 cm2
-   * Cathode: copper covered with less carbon, extracted from the same battery.+   * **Cathode**: copper covered with less carbon, extracted from the same battery.
      * Surface: 70*5 cm2      * Surface: 70*5 cm2
 +
 +__Performances__
 +
 +   * **Voltage**: started at 30mV, went up avove 40, and dropped down to 0 in 2 hours.
 +   * **Current**: started at 0.125 mA, and dropped down to 0 in 2 hours.
 +
 +**Max Power Measured**: 3.75 microW 
  
 ====Crate Design #2==== ====Crate Design #2====
 +
 +__Design features__
 +
 +   * **Substrate**: mud gathered from La Friche's garden on the day of assembly.
 +     * Volume: 80*30*2 cm3
 +   * **Container**: crate, covered with a transparent garbage plastic bag.
 +   * **Proton Exchange Membrane**: three to four overlapping sheets of newspaper, covered in ink.
 +     * Surface: 80*30 cm2
 +   * **Water**: mainly rainwater from the mudsource, with some tap water (0.5L) to complement - maybe chlorinated.
 +   * **Anode**: copper covered with carbon, extracted from a dead DELL PC battery found in the LFO storage space.
 +     * Surface: 70*5 cm2
 +   * **Cathode**: copper covered with less carbon, extracted from the same battery.
 +     * Surface: 70*5 cm2
 +
 +__Performances__
 +
 +Performances on Day0:
 +   * **Voltage**: around 5 mV.
 +   * **Current**: around 0.1 mA.
 +
 +Performances on Day1:
 +   * **Voltage**: around 45 mV.
 +   * **Current**: around 0.1 mA.
 +
 +Performances on Day2:
 +   * **Voltage**: around 130 mV peak.
 +   * **Current**: around 0.5 mA peak.
 +   * Strange measurement behavior: 
 +     * Voltage starts at 80 mV, and builds up to 130 mV in about 15 minutes.
 +     * Current starts at 0.7mA and drops to 0.3mA in about 15 minutes too.
 +
 +Performances on Day3:
 +   * **Voltage**: around 250 mV, stable.
 +   * **Current**: around 1.5 mA peak, decreasing slowly, stabilized around 0.60 mA.
 +
 +Performances on Day4:
 +   * **Voltage**: around 350mV, stable.
 +   * **Current**: around 1 mA.
 +
 +**Peak Power Measured**: 375 microW.
 +
 +**Max (stable) Power Measured**: around 350 microW.
 +
 +====Pile Microbienne Marseillaise====
 +
 +{{ :michka:research:microbial_fuel_cells:dscf6391.jpg?300 |}}
 +
 +__Design features__
 +
 +{{ :michka:research:microbial_fuel_cells:dscf6389.jpg?300 |}}
 +//Marine sediments sampling spot - Marseille, France//
 +
 +
 +   * **Substrate**: sea sediments gathered ten meters from the Catalan beach in Marseille on the day of assembly.
 +     * Volume: 0.5L
 +   * **Container**: 2L plastic bottle.
 +   * **Proton Exchange Membrane**: a piece of cardboard.
 +     * Surface: the bottle's section (diameter of 6-8 cm).
 +   * **Water**: seewater.
 +   * **Anode**: copper covered with carbon, extracted from a dead DELL PC battery found in the LFO storage space.
 +     * Surface: 50*5 cm2
 +   * **Cathode**: copper covered with less carbon, scrap from the [[michka:research:supercapacitors|supercapacitors]] experiment.
 +     * Surface: 20*5 cm2
 +
 +__Performances__
 +
 +Performances on Day0:
 +   * **Voltage**: about 13mV
 +   * **Current**: about 0.1 mA
 +
 +Performances on Day1:
 +   * **Voltage**: about 110mV
 +     * **Current**: starting at 7 mA ! And dropping slowly
 +
 +**Peak Power Measured**: 770 microW
 +
 +__Observations__
 +
 +Even though the multimeter was connected the wrong way (+ on anode, - on cathode), we first had positive (and quite high) current and voltage value. Is this due to remanant charges from the PC battery ?
 +
 +==Conclusion==
 +
 +From both these expriments and those conducted in Bruxelles, we can conclude that the MFC behavior improves and stabilizes with time.
 +
 +As the "pile micrboienne marseillaise" increases its performance way quicker than the "Crate Design #2" It seems that a better mcirobial & nutrient source induces quicker results.
 +
 +Using newspaper or cardboard as a Proton Exchange Membrane seems fine.
 +
 +New long-term experiments should be conducted to test other parameters, including more broadly available electrode materials.

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