Presentation on theme: "Microbial Fuel Cells And You!. What are MFCs? o MFCs are bioelectrical devices that harness the natural metabolisms of microbes to produce electrical."— Presentation transcript:
Redox Gradients Max potential ~1.2 V (= potential difference between NADH and O 2 ) If terminal e- acceptor has lower potential than O2: Bacteria gain less ATP per mole organic carbon oxidized Remaining energy is available to be used in MFC
MudWatt Steps 1) Make Fuel 2) MudWatt Construction 3) Monitor 4) Submit Data
MudWatt Steps Put ~3 cups of soil in bowl (Optional) Add mystery ingredient Hint: if your mystery ingredient is liquid, add just enough to make the soil “cookie dough” consistency Add water until “cookie dough” consistency Record your ingredients (and volume fraction of secret ingredient if one was used) 1) Make Fuel
MudWatt Steps Attach electrodes to dome lid (through donut disk) Attach ruler sticker to the side of vessel Put mud in vessel up to 1cm. Pat smooth Place in Anode (make sure there are no air bubbles) Put in more soil up to 4 cm Place in Cathode Let rest for 2min Decant liquid if needed (Cathode cannot be submerged) 2) Construct MudWatt
MudWatt Steps 3) Monitor (Perform this technique every week) Nob #1= Blinker Nob #2 = 100 Nob #3 = 500 Nob #4 = 1000 Nob #5 = 5000 Nob #6 = 10,000 S1) Switch the electronics panel to Open Circuit mode by turning all switches off. S2) After 30 minutes, check the voltage across the two leads using any voltmeter (black to “-“, and red to “+”). Record the voltage and the resistance. (the resistance is infinite under “Open Circuit” mode) S3) Repeat S2 for the 5 different resistances provided on the electronics panel. Turn only one Nob on at a time. The resistance for each Nob is outlined as follows (in Ohms):
MudWatt Steps Enter the data you’ve collected at www.keegotech.com/community/datashare 4) Submit Data Thank You! With the data collected and submitted by you and your fellow Keegoites, we hope to uncover trends and peculiar behaviors of microbial fuel cell technology. In this way, we aim to catalyze the development of this technology in the hope that someday MFCs will be a viable option in providing affordable and reliable energy for those who would benefit greatly from it. Developed by the public, for the public. All hail the Keegoites!