C5 - Fuel CELLS AND rechargeable Batteries nathan marshak.

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Presentation transcript:

C5 - Fuel CELLS AND rechargeable Batteries nathan 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 DESCRIBE HOW A HYDROGEN-OXYGEN FUEL CELL WORKS

C DESCRIBE HOW A HYDROGEN-OXYGEN FUEL CELL WORKS REACTION FOR ACIDIC ELECTROLYTE (e.g. Phosphoric Acid) Positive: 2O 2 + 4e - + 4H + --> 4H 2 O Negative: 4H 2 --> 4H + + 4e - Overall: 2H 2 + O 2 --> 2H 2 O

C DESCRIBE HOW A HYDROGEN-OXYGEN FUEL CELL WORKS REACTION FOR BASIC ELECTROLYTE (e.g. NaOH) Positive: H 2 + 2OH - --> 2H 2 O + 2e - Negative: O 2 + 2H 2 O + 4e - --> 4OH - Overall: 2H 2 + O 2 --> 2H 2 O

Nickel-Cadmium Battery C DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES

Nickel-Cadmium Battery C DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES REACTION AT NEGATIVE ELECTRODE (CADMIUM) REACTION AT POSITIVE ELECTRODE (NICKEL) OVERALL REACTION

C 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 DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES

Lighter than NiCd Consumer devices More voltage than NiCd, Shorter lifespan than NiCd Lithium-Ion Battery

C DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES Lithium-Ion Battery Positive: LiCoO 2 --> Li 1-x CoO 2 + xLi + +xe - Negative: C + xLi + + xe - --> CLi x Overall: LiCoO 2 + C --> Li 1-x CoO 2 + CLi x

CHARGINGDISCHARGING C DESCRIBE THE WORKINGS OF RECHARGEABLE BATTERIES