Electrochemistry and Surface Phenomena

Paper Code: 
CHY - 323
Credits: 
3
Contact Hours: 
45.00
Max. Marks: 
100.00
Objective: 
To understand the behaviour of ions in solution and structure of electrode surface. Surface        phenomena including three dimensional concepts of molecules.
 
10.00
Unit I: 
Ions in solution
Debye-Huckel theory of strong electrolysis (ion-ion & ion-solvent interaction), ionic strength, Debye- Huckel-Onsager conductance equation, activity coefficient , mean ionic activity coefficient, ionic strength, Debye-Hukel theory of mean ionic activity coefficient, Debye length, The Debye-Huckel limiting law, qualitative tests of the Debye-Huckel limiting law, Bjerrum model of ion-association.
 
8.00
Unit II: 
Electrochemistry: Electrical Double Layer
Introduction, evidences and structure of electrical double layer- Helmholtz-Perrin, Guoy-Chapman, Stern theory, measurement of zeta potential (electrokinetic phenomena), influence of ions on electrokinetic phenomena, 
Electro capillary phenomenon: electro capillary curves, Lipmann’s equation. 
 
10.00
Unit III: 
Kinetics of Electrode Reactions
 Electrodics of elementary electrode reactions:Determination of anode and cathode  potential, decomposition voltage of electrolyte, diffusion over potential, hydrogen and oxygen over voltage, influence of various factors on over voltage; Theoretical investigation of kinetics of an electrode reaction - Butler-Volmer equation, Tafel equation. 
Electrocatalysis-introduction and influence of various parameters.
Semiconductor solution interfaces, effect of light at semiconductor solution interface.
 
9.00
Unit IV: 
Surface Phenomena
Prerequisite- Surface tension, pressure difference across curved surface (laplace equation), vapour pressurebof droplet (calvin equation).
Adsorption by solids, chemisorption, application of adsorption, adsorption of gases by solids, factors influencing adsorption, the Freundlich adsorption isotherm, Langmuir theory of adsorption, derivation of the BET equation , types of adsorption isotherm, adsorption from solution, the Gibbs adsorption isotherm.
 
8.00
Unit V: 
Collidal Phenomena
Surface active agents, classification, hydrophobic interaction, Micelle formation: the mass action model and the phase separation model, shape and structure of micelles, micellar aggregation numbers, critical micelle concentration (CMC), factors affecting CMC, thermodynamics of CMC, thermodynamics of micellization , micelle temperature range (MTR) or Kraft point, solubilisation, microemulsion,and reverse micelles. 
 
References: 
  1. Modern Electrochemistry Vol. I & II, Second Edition; J.O.M. Bockris and A.K.N. Reddy; Plenum Press, New York, 2000.
  2. Electrochemistry; S. Glasstone, First Edition; Affiliated East-West press Pvt. Ltd., New Delhi, 1942.
  3. Principles of Colloid and Surface Chemistry, Second Edition; Paul C. Heimenz; Marcel Dekkan, New York, 1986.
 
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