Fuel Cells Flashcards

1
Q

How are fuels cells provided with fuel ?

A

From an external source of fuel (eg hydrogen) and oxygen from the air

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2
Q

How does the fuel cell generate electricity ?

A

By reacting hydrogen with oxygen
The fuel is oxidised electrochemically within the fuel cell to produce a potential difference

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3
Q

What can hydrogen fuel cells be used for ?

A

To power cars

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4
Q

What is the waste product produced by hydrogen fuel cells ?

A

No pollutants only water

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5
Q

Write the half equation, at the negative anode, for Hydrogen?

A

2H2 ——> 4H+ + 4e-

Hydrogen is oxidised

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6
Q

Write the half equation for oxygen at the cathode?

A

O2 + 4H2 + 4e- ——> 2H2O

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7
Q

What happens to hydrogen?

A

It is oxidised which produces water

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8
Q

Why are some pros of hydrogen fuel cells ?

A
  • run for alsong as you provide them with hydrogen
  • do not get less efficient as they run
  • can be a source of drinkable water
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9
Q

What are some cons of rechargeable batteries ?

A
  • will run out and need to be recharged
  • store less electricity the more charging cycles they go through meaning they need replacing
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10
Q

What are some cons of hydrogen fuel cells ?

A
  • run off hydrogen which can be explosive and is very difficult to store safely
  • produce a low potential difference or voltage so several are needed
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11
Q

What are some pros of rechargeable fuel cells ?

A
  • no dangerous fuels are required
  • can produce a greater potential difference than hydrogen fuel cells
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