Ing Ind - Inf (1 liv.)(ord. 270) - MI (347) INGEGNERIA CHIMICA

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096284 - ELECTROCHEMISTRY OF MATERIALS

Ing Ind - Inf (Mag.)(ord. 270) - MI (472) CHEMICAL ENGINEERING - INGEGNERIA CHIMICA

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096284 - ELECTROCHEMISTRY OF MATERIALS

Ing Ind - Inf (Mag.)(ord. 270) - MI (491) MATERIALS ENGINEERING AND NANOTECHNOLOGY - INGEGNERIA DEI MATERIALI E DELLE NANOTECNOLOGIE

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096284 - ELECTROCHEMISTRY OF MATERIALS

Obiettivi dell'insegnamento

The course is meant to provide a general background in electrochemistry and coverage of some areas of electrochemical processes and technologies.

Therefore, the main objective of the course is to introduce the students to the fundamentals of electrochemistry and complement the latter with the illustration of some particular applications, chosen among those with a focus on topics and issues generally relevant to material engineering.

Risultati di apprendimento attesi

The student is expected to acquire familiarity with the key concepts of electrochemistry and be able to critically analyse practical applications of electrochemistry in the light of the fundamental aspects denoting the peculiar nature of electrochemical systems.

Moreover and in particular, the student shall be able to use electrochemical understanding to discuss aspects of material processing and electrochemical energy storage.

Specifically, the student is expected to acquire the ability to analyse electrochemical processes in terms of the following aspects and fundamental concepts: double layer structure and its phenomenology; kinetics of charge transfer; basic aspects of kinetic mechanisms and electrocatalysis; diffusion kinetics; ionic transport and current distribution; significance and relevance of the nature, physical state and stability of electrode materials to their electrochemical behaviour.

These learning outcomes will enable the student to follow advanced courses in electrochemical technologies.

Argomenti trattati

Introduction. Short historical outline: early electrochemical technologies and the slow growth of electrochemistry as a science.

Electrochemical systems: general structure and functioning (electrolytic and galvanic cells), with presentation and discussion of various examples, such as: aluminium electrowinning cell, copper electrorefining cell, zinc - air battery, polymer electrolyte fuel cell. Electrolytes and conductivity. Transport properties of electrolytes: mechanical and electrical mobility; molar and equivalent conductivity; transport number. Solid electrolytes: defects and conduction mechanisms; oxide conductors for high temperature electrochemical cells and devices; Ag and Cu halide solid electrolytes; sodium ion conductors. Case study: sodium-ion batteries. Structure of the electrode-electrolyte interphase. Models of the double layer. Galvani and Volta potential. Electrochemical thermodynamics: fundamental relationships, electrochemical potential and the Nernst equation. The electrochemical series. Pourbaix diagrams. Case studies: (a) cells with junction and electrochemical sensing; (b) thermodynamics of fuel cells. Electrochemical kinetics. Overpotential and kinetic regimes. Butler-Volmer equation: single electron transfer processes. Low and high field approximation of the B.-V. equation; charge transfer resistance; Tafel's law. Multiple step e-transfer reaction. Mass transfer kinetics: the Nernst diffusion layer, steady-state diffusion controlled kinetics and mass transport limited kinetics. Diffusion control and mixed control regime. Mass transfer effects under transient conditions: Cottrell and Sand equations. Ionic transport and current distribution in electrochemical systems. A brief on electrocatalysis. The hydrogen electrode and the oxygen electrode. Electrocatalysis and electrode materials.

Electrochemical methods for the experimental study of electrode reactions. Steady state and transient techniques. Voltammetry and electrochemical impedance spectroscopy. Application examples: potentiostatic transient for the study of: pitting of aluminium alloys; nucleation behaviour in electrocrystallization. Electrochemical impedance characterization of polymer coated metals.

Electrochemical energy storage and conversion. Primary and secondary batteries. Alkaline batteries; lead-acid battery; secondary lithium batteries. Supercapacitors: principles and behaviour. Energy and power performances; experimental assessment of supercapacitor cell performance. Double layer and pseudo-capacitive effects. Hybrid devices. Fuel cells. Historical outline. Types of fuel cells: low (polymer electrolyte membrane FC) and high temperature systems (Solid oxide FC): performances and material issues. Electrochemistry of metals and oxides: anodic oxide films; electropolishing; low and high temperature oxidation (model of oxide film growth; Wagner's theory of oxidation).

Prerequisiti

A solid background in chemistry and physical chemistry is required.

Modalità di valutazione

Assessment will be through two sets of homework and a final oral presentation.

The homeworks consist of exercises relating to fundamental aspects of electrochemistry (namely, thermodynamics and kinetics of electrochemical systems) and problems requiring understanding of technical issues in electrochemical technologies or understanding of the characterization of electrochemical systems by electrochemical methods. A primary objective of these exercises and problems is that of assessing the basic understanding of electrochemical processes in practice and the ability to make simple calculations.

The final oral presentation wil be devoted to a specific application or technology. The student will propose the topic of his/her interest and acceptance of the topic will be decided together with the instructor.

Bibliografia

Presentations and lecture notes Keith B. Oldham, Jan C. Myland, Alan M. Bond, ELECTROCHEMICAL SCIENCE AND TECHNOLOGY. Fundamentals and Applications, Editore: John Wiley & Sons, Ltd, Anno edizione: 2012, ISBN: 978-0-470-71085-2
J.O. Bockris, A.K.N. Reddy, Modern Electrochemistry, Editore: Springer, Anno edizione: 2007, ISBN: 978-0-387-24569-0
Dieter Landolt, CORROSION AND SURFACE CHEMISTRY OF METALS, Editore: EPFL Press, Anno edizione: 207, ISBN: 978-2-940222-11-7

Forme didattiche

Tipo Forma Didattica

Ore di attività svolte in aula

(hh:mm)

Ore di studio autonome

(hh:mm)

Lezione

35:00

52:30

Esercitazione

15:00

22:30

Laboratorio Informatico

0:00

0:00

Laboratorio Sperimentale

0:00

0:00

Laboratorio Di Progetto

0:00

0:00

Totale

50:00

75:00

Informazioni in lingua inglese a supporto dell'internazionalizzazione

Insegnamento erogato in lingua
Inglese

Disponibilità di materiale didattico/slides in lingua inglese

Disponibilità di libri di testo/bibliografia in lingua inglese

Possibilità di sostenere l'esame in lingua inglese

Disponibilità di supporto didattico in lingua inglese