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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An Introduction to Sediment Microbial Fuel Cells

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An introduction to sediment microbial fuel cells

An Introduction to Sediment Microbial Fuel Cells


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


An introduction to sediment microbial fuel cells

  • If both substances are in the same solution, then the electrons transfer directly and the energy is dispersed as heat.


How does it work

How does it work?

  • 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

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

  • 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?

Cathode

Water

Anode

Fish Tank


So where are the chemicals

So, where are the chemicals?


What is the reaction

What is the reaction?

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:

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?

  • 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 like this…


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