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Related Concept Videos

Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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The Evidence for Evolution02:55

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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2D/2D Heterostructured CdS/WS2 with Efficient Charge Separation Improving H2 Evolution under Visible Light

Ke Zhang1,2, Mamoru Fujitsuka1, Yukou Du2

  • 1The Institute of Scientific and Industrial Research (SANKEN) , Osaka University , Mihogaoka 8-1 , Osaka 567-0047 , Ibaraki , Japan.

ACS Applied Materials & Interfaces
|May 29, 2018
PubMed
Summary

Developing earth-abundant photocatalysts for hydrogen (H2) evolution is crucial for clean energy. This study introduces a novel 2D/2D CdS/WS2 heterostructure, demonstrating significantly enhanced H2 production under visible light.

Keywords:
CdSWS2charge separationphotocatalytic H2 evolutiontwo dimensional heterostructure

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Renewable Energy

Background:

  • Efficient water splitting for hydrogen (H2) evolution under visible light is essential for addressing global energy and environmental challenges.
  • Developing earth-abundant and highly efficient photocatalysts remains a significant hurdle in this field.
  • Two-dimensional (2D) materials offer unique properties for advanced catalytic applications.

Purpose of the Study:

  • To synthesize and characterize a novel two-dimensional (2D)/2D heterostructure photocatalyst for efficient H2 evolution.
  • To investigate the photocatalytic performance of the CdS/WS2 heterostructure under visible light irradiation.
  • To elucidate the role of WS2 in enhancing the H2 evolution activity of CdS.

Main Methods:

  • Fabrication of a 2D/2D CdS/WS2 heterostructure using nanosheet CdS and nanosheet WS2.
  • Evaluation of photocatalytic H2 evolution rates under visible light irradiation.
  • Femtosecond time-resolved diffuse reflectance spectroscopy to study photogenerated electron dynamics.

Main Results:

  • The CdS/WS2 heterostructure, particularly with 10 wt% WS2, achieved a maximum H2 evolution rate of 14.1 mmol g-1 h-1.
  • This rate is approximately 8 times higher than that of pure CdS, demonstrating significantly enhanced photocatalytic activity.
  • Time-resolved spectroscopy confirmed that WS2 acts as an effective electron-trapping site and cocatalyst, promoting H2 evolution.

Conclusions:

  • The 2D/2D CdS/WS2 heterostructure is a highly efficient, noble metal-free photocatalyst for visible light-driven H2 evolution.
  • WS2 plays a critical role in improving charge separation and transfer, leading to enhanced photocatalytic performance.
  • This work highlights the potential of CdS/WS2 as a cost-effective and efficient solution for solar fuel production.