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Citation: Ji-Quan Liu, Huilin Guo, Ying Yang, Xiaohui Guo. Calculation and Discussion of Electrode Potentials in Redox Reactions of Water[J]. University Chemistry, ;2024, 39(8): 351-358. doi: 10.3866/PKU.DXHX202401031 shu

Calculation and Discussion of Electrode Potentials in Redox Reactions of Water

College of Chemistry and Materials Science, Northwest University, Xi'an 710127, China

Received Date: 10 January 2024
Revised Date: 21 February 2024

In electrochemistry, φ can be calculated via φ^⊖ and Nernst equation. Current physical chemistry textbooks only provide substances’ φ^⊖ 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 φ^⊖ (φ_B^⊖) from ∆_rG_m^⊖ based on ∆_fG_m^⊖ 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 φ^⊖ and φ are included. This may serve as a reference for teaching and research purposes.
- Redox reactions of water,
- Electrode potential calculation,
- φ–pH Diagram,
- Thermodynamic isotope effect
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