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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
UV–Vis Spectrum01:30

UV–Vis Spectrum

When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar absorptivity (ε) or log ε on the y-axis (ordinate)...
UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...

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Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
08:18

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Published on: July 12, 2016

Li-S battery analyzed by UV/Vis in operando mode.

Manu U M Patel1, Rezan Demir-Cakan, Mathieu Morcrette

  • 1Laboratory for Materials Electrochemistry, National Institute of Chemistry, Ljubljana, Slovenia.

Chemsuschem
|June 11, 2013
PubMed
Summary

UV/Vis spectrophotometry offers a powerful method for studying lithium-sulfur (Li-S) battery performance. This technique allows for the in situ analysis and quantification of polysulfides during battery operation.

Keywords:
batterieselectrochemistrylithiumsulfuruv/vis spectroscopy

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Lithium-sulfur (Li-S) batteries offer high theoretical energy density but suffer from performance degradation.
  • Polysulfide intermediates are key to understanding Li-S battery reaction mechanisms and degradation pathways.

Purpose of the Study:

  • To demonstrate UV/Vis spectrophotometry as an effective in situ analytical technique for studying polysulfides in Li-S batteries.
  • To enable quantitative and qualitative determination of polysulfide species during battery cycling.

Main Methods:

  • In situ UV/Vis spectrophotometry was employed to monitor polysulfide formation and evolution.
  • Analysis of spectral changes correlated with polysulfide chain lengths and concentrations.

Main Results:

  • UV/Vis spectrophotometry successfully identified and quantified different chain-length polysulfides.
  • The method provided real-time insights into the dynamic behavior of polysulfides during Li-S battery operation.

Conclusions:

  • UV/Vis spectrophotometry is a valuable tool for the in situ investigation of polysulfides in Li-S batteries.
  • This technique facilitates a deeper understanding of Li-S battery chemistry and aids in optimizing battery performance.