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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
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Active Photonic Glass for Hydrogen Generation.

Cong Wang1, Masa Johar1,2, Wahid Ullah1

  • 1Université Paris-Saclay, UMR 8000 CNRS, Institut de Chimie Physique, 91405, Orsay, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 4, 2024
PubMed
Summary

This study introduces a novel chiral photonic glass for energy applications. The material enhances photocatalytic hydrogen generation by tuning its photonic band gap to match light absorption, paving the way for advanced metamaterials.

Keywords:
Cellulose nanocrystalsChiral nematic structurePhotonic CrystalsSlow photon effectTiO2

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photocatalysis

Background:

  • Chirality is crucial in nature for iridescence and light harvesting.
  • Developing chiral photoactive materials is key for energy applications.
  • Existing methods for creating chiral photonic materials are complex.

Purpose of the Study:

  • To develop a straightforward method for creating chiral photonic glass.
  • To investigate the photocatalytic properties of chiral photonic glass incorporating gold nanoparticles.
  • To explore applications in energy conversion and asymmetric catalysis.

Main Methods:

  • Co-condensation of tetramethyl orthosilicate (TMOS) and titanium diisopropoxide bis(acetylacetonate) (TAA) within a cellulose nanocrystalline (CNC) liquid crystal.
  • Impregnation and chemical reduction to incorporate gold nanoparticles (Au NPs).
  • Characterization of photonic properties and photocatalytic activity.

Main Results:

  • Successfully fabricated inorganic glass with long-range chiral nematic ordering and tunable UV-visible photonic band gaps.
  • Demonstrated amplified charge carrier density and photocatalytic H2 generation when photonic band gap edges aligned with TiO2 absorbance and AuNP LSPR.
  • Chiral nematic ordering and tunable bandgap contribute to enhanced photocatalytic performance.

Conclusions:

  • The developed chiral photonic glass offers a promising platform for energy applications.
  • Tuning the photonic band gap is critical for optimizing photocatalysis.
  • This work advances the development of metamaterials for asymmetric photocatalysis and other applications.