Calculation and Discussion of Electrode Potentials in Redox Reactions of Water
In electrochemistry,φ can be calculated via φθ and Nernst equation.Current physical chemistry textbooks only provide substances'φθ under acidic conditions and corresponding practices.Hence,the calculation of φ works well under acidic conditions.However,it becomes complicated under alkaline conditions for some substances cannot exist in acidic conditions.These might lead to incorrect results and confused conclusions.To address this issue,the present study calculates φθ(φBθ) from ∆rGmθ based on ∆fGmθ of involved substances in redox half reaction.Then,φ at different pH is calculated via Nernst equation,resulting in a φ-pH diagram.Moreover,thermodynamic isotope effects on φθ and φ are included.This may serve as a reference for teaching and research purposes.
Redox reactions of waterElectrode potential calculationφ-pH DiagramThermodynamic isotope effect
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