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Redox Reactions01:24

Redox Reactions

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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...
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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...
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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...
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Spontaneous Chemical Reactions
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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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Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not...
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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A redox-flow electrochromic window.

James R Jennings1, Wei Yang Lim, Shaik M Zakeeruddin

  • 1Department of Materials Science and Engineering, Faculty of Engineering, NUSNNI-Nanocore, National University of Singapore , 117576 Singapore.

ACS Applied Materials & Interfaces
|January 14, 2015
PubMed
Summary
This summary is machine-generated.

This study presents a novel, low-cost electrochromic (EC) window. It utilizes a redox-flow system, eliminating the need for expensive transparent conductive oxide (TCO) substrates for dynamic tinting.

Keywords:
electrochromismioidide/triiodideredox-flowsmart windowstitanium dioxidetriphenylamine

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • Electrochromic (EC) windows offer dynamic tinting for smart building applications.
  • Traditional EC windows often rely on expensive transparent conductive oxide (TCO) substrates, limiting their cost-effectiveness.
  • Developing low-cost alternatives is crucial for widespread adoption of EC window technology.

Purpose of the Study:

  • To introduce and demonstrate a novel, low-cost electrochromic (EC) window.
  • To eliminate the requirement for expensive transparent conductive oxide (TCO) substrates in EC window design.
  • To explore a redox-flow system for EC window operation.

Main Methods:

  • A redox-flow system employing an aqueous I3–/I– electrolyte was developed.
  • A molecular layer of an electrochromic triphenylamine derivative was anchored to a mesoporous TiO2 scaffold.
  • The redox electrolyte was externally electrochemically controlled and circulated through the window using a peristaltic pump.

Main Results:

  • The prototype EC window demonstrated coloration and decoloration via the redox electrolyte's interaction with the triphenylamine derivative.
  • Key performance metrics including absorption characteristics, coloration/decoloration times, and cycling stability were evaluated.
  • The system successfully operated without TCO substrates, confirming the feasibility of the low-cost approach.

Conclusions:

  • A cost-effective EC window based on a redox-flow system and avoiding TCO substrates has been successfully demonstrated.
  • This approach offers a promising pathway for the development of affordable smart windows.
  • Further research can optimize the system for enhanced performance and long-term durability.