Electrode Potentials and Electrochemical Cells: Commercial Applications of Electrochemical Cells Flashcards

1
Q

What kind of cells are there?

A
  • Non-rechargeable

- Rechargeable

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2
Q

What type of reactions take place in non-rechargeable cells?

A
  • Irreversible
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3
Q

What type of reactions take place in rechargeable cells?

A
  • Reversible
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4
Q

Where are lithium-ion cells used?

A
  • Mobile phones

- Laptops

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5
Q

What reactions occur in a lithium-ion cell?

A

• Cathode
- Li+ (aq) + CoO2 (s) + e- ⇌ Li+[CoO2]- (s)

• Anode
- Li (s) ⇌ Li+ (aq) + e-

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6
Q

How are rechargeable cells recharged?

A
  • Current is applied
  • Forces electrons to move in opposite direction
  • Causes reaction to reverse, recharging the cell
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7
Q

What are fuel cells?

A
  • Type of electrochemical cell that can generate an electrical current without needing to be recharged
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8
Q

What reactions occur in an alkaline hydrogen-oxygen fuel cell?

A

• Cathode
- H2 (g) + 2OH- (aq) → 2H2O (l) + 2e-

• Anode
- O2 (g) + 2H2O (l) + 4e- → 4OH- (aq)

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9
Q

What are the benefits of fuel cells?

A
  • More efficient, convert more of their available energy into other energy stores
  • Only waste product is water, so no toxic chemicals
  • Don’t need to be recharged
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10
Q

What are the cons of fuel cells?

A
  • Need energy to produce supply of hydrogen
  • E.g electrolysis of water may be generated with fossil fuels
  • Hydrogen is highly flammable
  • Hydrogen fuel infrastructure not widely available for hydrogen fuel for cars
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