Subject Code & Name: EL25302 – Principles of Electrochemistry
Regulation: R-2025
Semester: III (Third Semester)
Branch: B. Tech. Chemical and Electrochemical Engineering (ChemElec)
Credits / L-T-P: 3 Credits | L-T-P: 3-0-0
Course Objectives
- To provide a comprehensive understanding of ion–solvent and ion–ion interactions, ion transport mechanisms in solutions, polarization and overpotential phenomena, colloidal electrochemistry, and electrochemical behaviour of modified electrodes along with their characterization.
Full Unit-wise Syllabus
Unit I – Ion-Solvent & Ion-Ion Interactions
Ion-solvent interaction, ExperimentalH and Ion-solvent interaction – Expression for verification of Born Model, Ion-dipole model of ion-solvent interaction and expression for heat of solvation, Ion-Ion Interaction – True and Potential electrolytes, Debye-Huckel (ion-cloud) theory of ion-ion interactions, Activity coefficients and ion-ion interaction
Activities: Numerical problems on activity coefficients and Debye–Hückel theory; derivation-based exercises.
Unit II – Ion Transport in Solution
Diffusion & Diffusion coefficient, Einstein-Smoluchowski equation, Conduction, Molar & Equivalent conductivity, Kohlrausch’s Law, Ionic mobility, Stokes-Einstein relation, NernstEinstein equation, Transport numbers – determination by Hittorf’s & Moving Boundary methods – Walden’s rule - Debye Huckel-Onsager equation, non-aqueous solutions.
Activities: Problem-solving on conductivity and transport numbers; experimental data interpretation.
Unit III – Polarisation And Over Potential
Electrolytic polarization, Dissolution and Decomposition potential, Overvoltage – hydrogen and oxygen overvoltage, applications, Polarography – principles, diffusion layer, limiting current density, polarographic circuit, dropping mercury electrode, merits & demerits, supporting electrolyte, current maxima, polarograms, half wave potential, diffusion current, applications.
Activities: Analysis of polarograms; numerical problems on overpotential and limiting current.
Unit IV – Colloidal Electrochemistry
Electrochemical properties of colloids – Charge on colloidal particles, Electrical Double Layer, Coagulation of colloidal sols, Electrokinetic phenomena - Electro-Osmosis – Determination of zeta potential, Electrophoresis – sedimentation potential (Dorn effect), Determination of colloidal particle size, Surfactant, Emulsion, Emulsifiers, gels – Applications.
Activities: Case studies on colloidal stability; calculations related to zeta potential.
Unit V – Electroactive Layers and Modified Electrodes
Chemically modified electrodes, Types and methods of modification – chemisorption, covalent bond formation, polymer film coatings, inorganic materials, Langmuir-Blodgett (LB) methods, properties of the modified electrodes, electrochemistry at monolayer and multilayer modified electrodes, characterisation of modified electrodes.
Activities: Review of recent research papers; analysis of electrode modification techniques.
Course Outcomes (COs)
- CO1: Apply electrochemical theories and models to explain ion solvent and ion ion interactions.
- CO2: Analyze ion transport mechanisms and conductivity behaviour in electrolyte solutions.
- CO3: Evaluate polarization phenomena and overpotential effects in electrochemical processes.
- CO4: Create models to predict electrochemical properties of colloids and electrokinetic phenomena.
- CO5: Design modified electrodes and electrochemical systems using characterization techniques for targeted applications.
Assessment Pattern (Quick Note)
- Weightage: Continuous Assessment 40% | End Semester Examinations 60%
- Internal methodology: Assignments (20%), Solution to application-oriented problems (20%), Research Paper presentation (20%), Internal Examinations (40%)
Source: Official Anna University – B. Tech. Chemical and Electrochemical Engineering R-2025 Curriculum
Last Updated: September 2026
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