11_Electrochemistry2 - Applica'ons of Oxida'on- Reduc'on...

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Applica’ons of Oxida’on- Reduc’on Reac’ons 1 Ba6eries and Corrosion MJ Bojan
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Ba6eries Self contained electrochemical cell Primary batteries (not rechargeable) Secondary batteries (rechargeable) Fuel Cells IMPROVEMENTS: – achieved via research 2 Ba6eries and Corrosion MJ Bojan
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Ba6eries DRY CELL (Flashlight battery) Cathode: NH 4 Cl + MnO 2 + graphite paste 2NH 4 + (aq) + 2MnO 2 (s) + 2e Mn 2 O 3 (s) + 2NH 3 (aq) + H 2 O E cell = 1.5 V Anode: Zn(s) Zn(s) Zn 2+ (aq) + 2e 3 Ba6eries and Corrosion MJ Bojan
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Provides up to 50% more energy. Zn is used as a powder mixed with the electrolyte. Batteries In ALKALINE CELL: NH 4 Cl is replaced by KOH. Anode: Zn(s) + KOH Zn(s) + 2OH (aq) ZnO(s) + H 2 O( l ) + 2e Cathode: MnO 2 + graphite paste 2MnO 2 (s) +2H 2 O(l) + 2e 2MnO(OH)(s) +2OH (aq) E cell = 1.55 V How do we get a 9V battery??? 4 Ba6eries and Corrosion MJ Bojan
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Ba6eries 5 Ba6eries and Corrosion MJ Bojan
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Ba6eries Lead/Acid Battery Pb(s) H 2 SO 4 (aq) Pb(s) anode cathode ± Ba6eries and Corrosion MJ Bojan
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Lead Acid Ba6eries - Discharge Why doesn’t the overall reac±on proceed
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This note was uploaded on 01/18/2012 for the course CHEM 112 taught by Professor Vandersluys,lorschmid,kylem during the Summer '07 term at Pennsylvania State University, University Park.

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11_Electrochemistry2 - Applica'ons of Oxida'on- Reduc'on...

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