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Standard Electrode Potentials

Standard Electrode Potentials

On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...

Processes at Electrodes

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The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...

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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...

Electrodeposition

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Electrochemical Systems

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...

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In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy

Published on: September 12, 2018

Metal electrode potential diverges with ion additions.

Qiu Zhang^1,2, Seongjae Ko¹, Taisei Sakata¹

¹Department of Chemical System Engineering, The University of Tokyo, Bunkyo-ku, Japan.

Nature Chemistry

|May 26, 2026

Summary

This summary is machine-generated.

Controlling electrode redox potential is key for electrochemical reactions. This study shows how ion coordination shells, based on ion hardness/softness, significantly shift redox potentials, improving zinc plating efficiency.

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Area of Science:

Electrochemistry
Materials Science
Solution Chemistry

Background:

Electrode redox potential dictates electrochemical reaction direction and driving force.
Electrolyte composition significantly influences redox potential, but control remains challenging.

Purpose of the Study:

To investigate the effect of coordination-shell ions on metal electrode redox potentials.
To establish a strategy for effectively controlling redox potential shifts.

Main Methods:

Investigated the Zn/Zn2+ system using electrolytes with varying anion and cation hardness/softness.
Utilized liquid Madelung potential calculations to corroborate experimental findings.
Performed zinc plating/stripping tests to evaluate practical applications.

Main Results:

Cooperative interactions between metal ions and surrounding ions amplify redox potential shifts.
A large potential gap exceeding 0.6 V was achieved by manipulating ion hardness/softness.
Electrolytes with upshifted redox potentials improved zinc plating Coulombic efficiency to over 99.9%.

Conclusions:

Ion hardness/softness in coordination shells provides a powerful strategy for tuning electrode redox potentials.
This approach offers practical benefits for electrochemical applications like zinc plating.