EDU's Hydrogen Sensing Δ 13th of January 2014 Ω 5:11 AM

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«Hydrogen Sensing	Θ	Θ
ΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞΞ

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~ PennState

»PennState
ξ the direct conversion of organic matter to electricity using bacteria
ξ it has been known for many years that bacteria could be used to generate electricity
ξ expensive and toxic chemicals were needed to shuttle electrons from the bacteria to the electrode and purified chemicals (such as glucose) were needed for the bacteria to grow on
ξ can now make electricity using any biodegradable material-- even wastewater
ξ don't have to add any special chemicals if we use bacteria already present in the wastewater

How does a microbial fuel cell work?
ξ when bacteria are placed in the anode chamber of a specially-designed fuel cell that is free of oxygen, they attach to an electrode
ξ because they do not have oxygen, they must transfer the electrons that they obtain from consumption (oxidation) of their food somewhere else than to oxygen
ξ they transfer them to the electrode
ξ in a MFC these electrons therefore go to the anode, while the counter electrode (the cathode) is exposed to oxygen
ξ at the cathode the electrons, oxygen and protons combine to form only water
ξ the two electrodes are at different potentials (about 0.5 V), creating a bio-batter (if the system is not refilled) or a fuel cell (if we constantly put in new food or "fuel" for the bacteria)

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