An introduction to sediment microbial fuel cells
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An Introduction to Sediment Microbial Fuel Cells. What is a Fuel Cell?. A fuel cell is a device that generates electricity through a chemical reaction. It is similar to a battery, but unlike a battery the chemicals can be continuously supplied. What is electricity?.

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Presentation Transcript

What is a fuel cell
What is a Fuel Cell?

  • A fuel cell is a device that generates

    electricity through a chemical reaction.

  • It is similar to a battery, but unlike a battery

    the chemicals can be continuously supplied


What is electricity
What is electricity?

  • Electricity is energy made available through the flow of electrons.

Loses electrons

Gains

electrons



How does it work
How does it work? electrons transfer directly and the energy is dispersed as heat.

  • If the two substances are separated, and the electrons are transferred through a wire then the energy is transformed into electricity.

Tube filled with electrolyte solution

e-

Gains

electrons

Loses electrons

Electrodes


Vocab
Vocab electrons transfer directly and the energy is dispersed as heat.

Electrode:

  • The site at which electrons are either released or collected.

  • Two types of electrodes:

    • Anode (-): The site at which electrons are collected.

    • Cathode (+): The site at which electrons are released.


Vocab1
Vocab electrons transfer directly and the energy is dispersed as heat.

  • Electrolyte solution:

    A solution that can carry ions between the anodic and cathodic chambers.


How do we apply this to a sediment microbial fuel cell
How do we apply this to a sediment microbial fuel cell? electrons transfer directly and the energy is dispersed as heat.

Cathode

Water

Anode

Fish Tank


So where are the chemicals
So, where are the chemicals? electrons transfer directly and the energy is dispersed as heat.


What is the reaction
What is the reaction? electrons transfer directly and the energy is dispersed as heat.

Two parts to the reaction:

  • Reaction in the anodic chamber

    + H2O  CO2 + H+ + electrons

  • Reaction in the cathodic chamber

    Oxygen + H+ + electrons  H2O

Organic compound


For example
For example: electrons transfer directly and the energy is dispersed as heat.

Anodic chamber

C2H4O2 + 2H2O  2CO2 + 4H+ + 4e-

OR

C6H12O6 + 6H2O  6CO2 + 24H+ + 24e-

Cathodic chamber

4O2 + 4H+ + 4e- 4H2O

OR

6O2 + 24H+ + 24e-  12H2O


Why do we need the microbes
Why do we need the microbes? electrons transfer directly and the energy is dispersed as heat.

  • The microbes are what make the reaction “go”. They are the catalyst.

  • A catalyst initiates or accelerates a chemical reaction but remains unchanged.

  • Example: enzymes


Kinda like this
Kinda electrons transfer directly and the energy is dispersed as heat. like this…


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