The cell also makes a great habitat for a beta fish... The bacteria decompose the fish poop adding to the cell's fuel and keeping the water clean!
Step 1: Get Some MUCK!
Muck has all kinds of awesome bacteria, one of which is Geobacter, it produces electrons as part of its cellular digestion!
Step 2: Prepare The Proton Exchange Membrane
The bacteria produce hydrogen IONS (an ion is an atom that has lost electrons)...a hydrogen ATOM is nothing but a proton and an electron buzzing around it...its like if the Earth was a proton and the moon was an electron...take away the moon....er I mean the electron and all you are left with is a single PROTON aka a hydrogen ION
The PEM as they say allows protons through it and recombine with oxygen and the electrons to form a circuit and H20 as a byproduct.
Step 3: Make Electrodes
Cut up strips of window screen and fold them into a square.
Google how to make "char cloth"....normally its made by survivalists to act as tinder for fire making but the high carbon content will make the bacteria grow and exchange their electrons to the window screen wire! Wrap the screen around a thick mat of carbon cloth. You can also just strip the insulation off the black wire and wrap the copper inner wires around a thick mat of char cloth if you don't have window screen or alligator clips.
PREPARE THE CATHODE (+)
Strip the red wire's insulation back to expose the copper wire's "dendrites" or "feelers" as I like to call them.