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Making H2 from Light and Biomass over Ni/Mo2C Catalysts under Mild Conditions.

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Developing efficient catalysts for biomass conversion is key for sustainable energy. This study presents Ni-coated Mo2C microspheres as effective catalysts for photothermal reforming of biomass into hydrogen under mild conditions.

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Area of Science:

  • Materials Science
  • Catalysis
  • Renewable Energy

Background:

  • Photothermal reforming of biomass offers a promising route for hydrogen production.
  • Efficient catalytic systems for biomass-to-hydrogen conversion under mild conditions are challenging.
  • Developing novel catalysts is crucial for advancing biomass utilization.

Purpose of the Study:

  • To develop an efficient catalyst for the photothermal reforming of biomass into hydrogen.
  • To investigate the catalytic activity of Ni-coated Mo2C microspheres (Ni/Mo2C) in neutral aqueous solutions.
  • To understand the mechanism of enhanced catalytic activity in the Ni/Mo2C system.

Main Methods:

  • Synthesis of Ni-coated Mo2C microsphere (Ni/Mo2C) composites.
  • Photothermal reforming experiments using common plant biomass (e.g., wheat straw).
  • Characterization of catalyst properties and evaluation of hydrogen evolution rates under Xe lamp irradiation.

Main Results:

  • Ni/Mo2C composites exhibited distinct electron-depleted Ni (Niδ+) and electron-accumulated Mo2C (Mo2Cδ-) regions.
  • Niδ+ sites facilitated biomass oxidation, while Mo2Cδ- sites promoted hydrogen generation.
  • A maximum hydrogen evolution rate of 117 μmol g-1 h-1 was achieved using wheat straw under optimized conditions.
  • Successful conversion of biomass to hydrogen in neutral aqueous solution was demonstrated.

Conclusions:

  • Ni/Mo2C catalysts are highly efficient for photothermal reforming of biomass to hydrogen.
  • The synergistic effect between Ni and Mo2C enhances catalytic performance.
  • This approach provides a viable pathway for sustainable hydrogen production from biomass.