Electrochemistry_V_Batteries_Etc

Electrochemistry_V_Batteries_Etc - BATTERIES Galvanic cells...

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BATTERIES Oxidation Reduction Galvanic cells are batteries (not practical) Conversion to more useful battery includes: •No H 2 source—higher voltage, less complicated, and cheaper •Pt electrode replaced with electrode which is inert, inexpensive, and has large surface area—e. g. porous graphite •More rugged housing incorporating geometry for salt bridge enabling larger currents •Fragile •Low current •Inefficient •Low energy density Example: Why not good Battery:
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BATTERIES Cells connected in parallel—current capacity adds; same voltage Cells connected in series—voltages add; current same EXAMPLE: For a 2 V cell with a maximum sustained current of 5 A, what are the properties for 6 cells connected (a) in parallel and (b) in series? (a) 2 V with a maximum sustained current of 30A. (b) 12 V with a maximum sustained current of 5A.
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RECHARABLE LEAD STORAGE BATTERY (DISCHARGE) Lead plate consisting of compressed spongy lead Anode: (large surface area) (large currents) Thus, the net process at the anode Cathode: Lead plate containing lead(IV) oxide In each case as the lead ion forms it combines with a sulfate ion and the lead sulfate precipitate adheres to its lead plate.
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(a) A simplified schematic representation of one cell of a lead storage battery (2 V). RECHARABLE LEAD STORAGE BATTERY (DISCHARGE) Whitten
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(b) Six of these cells are connected together in series, making a 12-volt battery. RECHARABLE LEAD STORAGE BATTERY (DISCHARGE) Whitten
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RECHARABLE LEAD STORAGE BATTERY (DISCHARGE) The net cell reaction and its standard potential during discharge: •The decrease in the concentration of sulfuric acid provides an easy method for measuring the degree of discharge, because the density of
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Electrochemistry_V_Batteries_Etc - BATTERIES Galvanic cells...

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