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====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====

__Design features__

{{ :michka:research:microbial_fuel_cells:dscf6377.jpg?300 |Clay Sampling Location - Niolon, France}}

   * **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.
     * 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
   * **Cathode**: copper covered with less carbon, extracted from the same battery.
     * 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====

__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 |}}

   * **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 ?