Electrochemistry Crash Course for Engineers by Slobodan Petrovic

Author:Slobodan Petrovic
Language: eng
Format: epub
ISBN: 9783030615628
Publisher: Springer International Publishing

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This is the most important relation in electrochemistry (in addition to the Nernst equation and Faradays Laws). It presents a method to calculate cell voltage from a known value for Gibbs Energy or vice versa. From before, a criterion for spontaneous change is: ΔG < 0. If ΔG < 0, then Ecell > 0 (Ecell must be positive if ΔG is negative). If Ecell is positive, a reaction occurs spontaneously in the forward direction while if Ecell is negative, the reaction occurs spontaneously in the reverse direction. If a cell reaction is reversed, Ecell changes sign.

Example 7

Calculate cell voltage for a hydrogen fuel cell operating at 200 °C if ΔG = −220.4 kJ.

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