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Redox Reactions

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...

Redox Reactions

Redox Reactions

Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...

Redox Equilibria: Overview

Redox Equilibria: Overview

A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...

Balancing Redox Equations

Balancing Redox Equations

Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...

Voltaic/Galvanic Cells

Voltaic/Galvanic Cells

Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...

Electrolysis

Electrolysis

In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...

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Related Experiment Video

Updated: Nov 19, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Published on: October 12, 2019

Solid-state redox couple mediated water splitting.

Duanduan Liu¹, Wei Wei, Maidina Mahemu

¹National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory for Nano Technology, Department of Physics, Nanjing University, No. 22, Hankou Road, Nanjing, Jiangsu 210093, P.R. China.

Dalton Transactions (Cambridge, England : 2003)

|February 2, 2021

Summary

This summary is machine-generated.

Solid-state redox couples enhance electrochemical water splitting for renewable energy storage. These mediators improve oxygen evolution and hydrogen evolution reactions, enabling efficient energy capture.

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Area of Science:

Electrochemistry
Materials Science
Renewable Energy

Background:

Solid-state redox couples are crucial for efficient charge transfer in water splitting.
Electrochemical water splitting is key for storing intermittent renewable energy.

Purpose of the Study:

To review the applications of redox couples in electrochemical water splitting.
To highlight novel strategies for energy storage using redox-couple-mediated systems.

Main Methods:

Literature review of redox couple applications in water splitting.
Analysis of redox couples in promoting oxygen evolution reaction (OER) kinetics.
Exploration of redox couples in decoupling hydrogen evolution reaction (HER) and OER.
Investigation of combined electrochemical-thermochemical water splitting.

Main Results:

Redox couples significantly enhance OER kinetics.
Redox couples enable independent control over HER and OER.
Combined electrochemical-thermochemical approaches show promise.
Redox-couple-mediated water splitting offers a pathway for renewable energy storage.

Conclusions:

Solid-state redox couples present a versatile platform for advancing water splitting technologies.
These mediators are essential for efficient energy storage from fluctuating renewable sources.
Future research directions include optimizing redox couples for integrated energy systems.