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Enhanced photocatalytic hydrogen generation using polymorphic macroporous TaON.

Min-Ying Tsang1, Natalie E Pridmore, Lisa J Gillie

  • 1Department of Chemistry, University of York, Heslington, York, YO10 5DD UK.

Advanced Materials (Deerfield Beach, Fla.)
|June 26, 2012
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Summary
This summary is machine-generated.

Macroporous tantalum oxynitride (mac-TaON) exhibits enhanced photocatalytic hydrogen generation. This novel material, a mix of β and γ polymorphs, demonstrates double the activity compared to conventional synthesis methods.

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Conventional synthesis of tantalum oxynitride (TaON) typically yields the β polymorph.
  • Powder synthesis methods often lack control over porosity and phase composition.
  • Photocatalytic hydrogen generation is a key area for renewable energy research.

Purpose of the Study:

  • To develop a macroporous tantalum oxynitride (mac-TaON) material.
  • To investigate the phase composition of the synthesized mac-TaON.
  • To evaluate the photocatalytic activity of mac-TaON for hydrogen generation.

Main Methods:

  • Polymer sphere templating was employed for macropore formation.
  • Controlled ammonolysis was used to synthesize the TaON material.
  • Photocatalytic hydrogen generation experiments were conducted under specific conditions.

Main Results:

  • Macroporous TaON (mac-TaON) was successfully synthesized.
  • The synthesized mac-TaON was found to be a mixture of β and γ polymorphs.
  • Normalized for surface area, mac-TaON demonstrated twice the photocatalytic activity for hydrogen generation compared to conventional TaON.

Conclusions:

  • Polymer sphere templating enables the synthesis of macroporous TaON with mixed β and γ polymorphs.
  • The unique structure and phase composition of mac-TaON significantly enhance photocatalytic hydrogen generation efficiency.
  • This macroporous material represents a promising advancement for solar fuel production.