C5 - Fuel CELLS AND rechargeable Batteries nathan marshak.
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Transcript of C5 - Fuel CELLS AND rechargeable Batteries nathan marshak.
C5 - Fuel CELLS AND rechargeable Batteriesnathan marshak
Instead of recharging, you add fuel
Lower environmental impact
Expensive.
FUEL CELLS
Secondary cells are rechargeable.
Store small amounts of energy
Cheap.
BATTERIES
C.5.3 - DESCRIBE HOW A HYDROGEN-OXYGEN FUEL CELL WORKS
C.5.1 - DESCRIBE HOW A HYDROGEN-OXYGEN FUEL CELL WORKSREACTION FOR ACIDIC ELECTROLYTE (e.g.
Phosphoric Acid)Positive: 2O2 + 4e - + 4H+ --> 4H2ONegative: 4H2 --> 4H+ + 4e-
Overall: 2H2 + O2 --> 2H2O
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C.5.1 - DESCRIBE HOW A HYDROGEN-OXYGEN FUEL CELL WORKS
REACTION FOR BASIC ELECTROLYTE (e.g. NaOH)
Positive: H2 + 2OH- --> 2H2O + 2e-
Negative: O2 + 2H2O + 4e- --> 4OH-
Overall: 2H2 + O2 --> 2H2O
Nickel-Cadmium Battery
C.5.2 - DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES
Nickel-Cadmium Battery
C.5.2 - DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES
REACTION AT NEGATIVE ELECTRODE (CADMIUM)
REACTION AT POSITIVE ELECTRODE (NICKEL)
OVERALL REACTION
C.5.2 - DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES
Used in cars to start it.
Battery charges while car is running.
Amount of charge left can be measured
Heavy
Lead Acid Battery
C.5.2 - DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES
C.5.2 - DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES
Lighter than NiCd
Consumer devices
More voltage than NiCd,
Shorter lifespan than NiCd
Lithium-Ion Battery
C.5.2 - DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES
Lithium-Ion Battery
Positive: LiCoO2 --> Li1-xCoO2 + xLi+ +xe-
Negative: C + xLi+ + xe- --> CLix
Overall: LiCoO2 + C --> Li1-xCoO2 + CLix
CHARGING DISCHARGING
C.5.2 - DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES