Chapter 1 - Intoduction CHG8300F

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University of Ottawa *

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Oct 30, 2023

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Chapter 1: Introduction to Electrochemistry Foundations, Definitions and Concepts CHG8300F Electrochemical Engineering Prof. Baranova, uOttawa
Oxidation-Reduction Reactions ¡ Describing Oxidation-Reduction Reactions – An oxidizing agent is a species that oxidizes another species; it is itself reduced . – A reducing agent is a species that reduces another species; it is itself oxidized . ) ( ) ( 2 ) ( 2 ) ( s aq aq s Cu Fe Cu Fe + ® + + + oxidizing agent reducing agent Loss of 2 e -1 oxidation Gain of 2 e -1 reduction
Voltage and Current in Electrochemistry Electrochemistry deals with physically separated oxidation-reduction reactions. Such reactions take place in a cell as two half-reactions. – The force with which electrons travel from the oxidation half-reaction to the reduction half-reaction is measured as voltage . – The rate the electrons are being transferred with is measured as current .
4 Electrochemical engineering science is a discipline which on the basis of the fundamental laws of electrochemistry deals with electrochemical systems and processes according to scientific principles finding its place between chemical engineering and electrochemistry What is Electrochemical Engineering? • Electroplating • Batteries • Fuel Cells • Corrosion • Electrosynthesis / Electrorefining • Sensors 10% of US/Canada electricity goes to electrosythesis/refining 4% of US/Canada economy is eaten-up by corrosion each year.
5 Electroplating Electroplating is the coating of an electrically conductive object with a layer of metal using electrical current. The result is a thin, smooth, even coat of metal on the object. Reduction of divalent copper ions to copper metal at the cathode: Cu 2+ + 2e - → Cu Oxidation of water at the anode: H 2 O → 1/2 O 2 + 2H + + 2e -
6 State-of-the-art Intel, IBM, and AMD chips have 70 nm copper plated wires connecting a billion transistors! Electroplating
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