L28 - Dr P Lucas U of A MSE 110 Electrochemical devices...

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Unformatted text preview: Dr. P. Lucas U of A MSE 110 Electrochemical devices When controlled, redox reactions can be used in many useful ways: • The reaction in primary batteries is non-reversible, hence primary batteries are discarded after discharge. • The reaction in secondary batteries is reversible. Applying a voltage to the cell induces the revert reaction and regenerates the reactants. • Due to its light weigh and low E o , lithium is ideal for high energy densities batteries. • In Li-ion batteries, Li + migrates back and forth between the insertion anode and cathode. ∆ E is constant because all reactants are solids. • A fuel cell is a battery where the reactant are continuously supplied and the product continuously removed. • Copper is electrochemically refined by oxidizing the impure Cu anode and reducing only Cu 2+ into a pure Cu cathode. • Using a similar principle, a metal used as an anode can be oxidized and platted on a another metal used as the cathode. SUMMARY FROM LAST CLASS Dr. P. Lucas U of A MSE 110 Crystalline solids NUCLEATION AND CRYSTALLIZATION • For all types of solids, metallic, ionic covalent and molecular, the bonding energy is maximum at a specific equilibrium bonding distance r o . • This bonding energy or lattice energy essentially corresponds to the enthalpy of fusion ∆ H f released when the liquid crystallizes. ∆ H f T A T B Dr. P. Lucas U of A MSE 110 Enthalpy of fusion NUCLEATION AND CRYSTALLIZATION ∆ H f T A T B • At the limit temperature T f the atoms start bonding together to lower...
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This note was uploaded on 11/19/2009 for the course MSE 110 taught by Professor Lucas during the Spring '08 term at Arizona.

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L28 - Dr P Lucas U of A MSE 110 Electrochemical devices...

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