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Ordered Bicontinuous Mesoporous Polymeric Semiconductor Photocatalyst.

Qian Li1, Chuanshuang Chen1, Chen Li1

  • 1School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.

ACS Nano
|October 9, 2020
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel bicontinuous porous graphitic carbon nitride (g-CN) photocatalyst with a unique double diamond structure. This material shows high efficiency in visible-light-driven water splitting for hydrogen production.

Keywords:
bicontinuous structureblock copolymermesoporous materialsphotocatalystself-assembly

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photocatalysis

Background:

  • Bicontinuous porous materials offer significant potential in energy and catalysis due to their unique structures.
  • The synthesis of these materials, particularly those with ordered 3D interconnected pores, remains a significant challenge.

Purpose of the Study:

  • To develop a novel synthesis protocol for bicontinuous porous organic semiconductor photocatalysts.
  • To create a graphitic carbon nitride (g-CN) material with a double diamond (DD) structure and interconnected mesopores.

Main Methods:

  • Solvent evaporation-induced self-assembly of polystyrene-block-poly(ethylene oxide) and tetraethyl orthosilicate to form a SiO2 template with DD structure.
  • SiO2-templated self-condensation of melamine monomers under vacuum to yield DD-structured g-CN.

Main Results:

  • Successful synthesis of DD-structured g-CN with two sets of 3D continuous mesopores (14 nm mean diameter).
  • Achieved high specific surface area (131 m2 g-1) and an optical band gap of 2.8 eV.
  • Demonstrated high visible-light-driven photocatalytic activity for water splitting (6831 μmol g-1 h-1 H2 production) with excellent stability.

Conclusions:

  • The study provides an effective protocol for constructing ordered mesoporous materials with 3D continuous channels.
  • The synthesized bicontinuous mesoporous g-CN is a promising material for catalysis applications, particularly in visible-light-driven water splitting.