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Voltaic/Galvanic Cells02:47

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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,...
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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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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...
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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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 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Redox Potential Based Self-Powered Electrochromic Devices for Smart Windows.

Mukhesh K Ganesha1,2, Hafis Hakkeem1, Ashutosh K Singh1,2,3

  • 1Centre for Nano and Soft Matter Sciences, Bengaluru, 562162, India.

Small (Weinheim an Der Bergstrasse, Germany)
|June 14, 2024
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Summary

Redox potential-based self-powered electrochromic (RP-SPEC) devices offer autonomous smart window operation. These energy-efficient devices store and supply power, advancing sustainable infrastructure.

Keywords:
electrochromicelectrochromic displaysredox‐potentialself‐poweredsmart window, tungsten oxide

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Area of Science:

  • Materials Science
  • Energy Storage
  • Sustainable Infrastructure

Background:

  • Energy-efficient windows are crucial for zero-energy buildings.
  • Conventional electrochromic (EC) devices face cost and power source limitations.

Purpose of the Study:

  • Introduce redox potential-based self-powered electrochromic (RP-SPEC) devices.
  • Demonstrate autonomous operation and dual functionality for smart windows.

Main Methods:

  • Utilized tungsten oxide (WO3) and vanadium-doped nickel oxide (V-NiO) as EC materials.
  • Incorporated aluminum (Al) as an anode for self-powering capabilities.
  • Investigated redox interactions for coloring/bleaching and photo-charging.

Main Results:

  • RP-SPEC devices achieved open circuit voltages (OCV) over ±0.3 V for autonomous cycling.
  • WO3 films demonstrated 88% modulation and 1% transmission at 550 nm.
  • Devices powered external electronics for up to 81 hours and showed large-area feasibility (≈28 cm2).

Conclusions:

  • RP-SPEC devices offer a viable solution for self-powered, energy-efficient smart windows.
  • The technology advances sustainable infrastructure by reducing external power dependency.
  • Dual functionality for powering electronic devices enhances the value proposition.