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

slide4

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.

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
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