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Plasmon-Enhanced Multicarrier Photocatalysis.

Firdoz Shaik1, Imanuel Peer1, Prashant K Jain2

  • 1Schulich Faculty of Chemistry , Technion-Israel Institute of Technology , Haifa 32000 , Israel.

Nano Letters
|June 23, 2018
PubMed
Summary

Harvesting charge carriers from semiconductor multiexcitons enhances photocatalytic efficiency by minimizing back reactions. Plasmonic antennas amplify multiexciton generation, boosting solar fuel conversion.

Keywords:
CO2 reductionPhotocatalysismulticarrier generationsemiconductor-metal nano hybridssurface plasmon resonancewater splitting

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Area of Science:

  • Photocatalysis
  • Solar energy conversion
  • Materials science

Background:

  • Solar fuel production often involves multielectron redox reactions with reactive intermediates, leading to efficiency losses from back reactions.
  • Minimizing these undesirable pathways is crucial for improving the overall efficiency of solar energy conversion into liquid fuels.

Purpose of the Study:

  • To investigate methods for minimizing back reactions in photocatalysis.
  • To enhance photocatalytic efficiency by utilizing multiexcitonic states in semiconductor photocatalysts.

Main Methods:

  • Employing a plasmonic antenna composed of gold nanoprisms to amplify multiple carrier excitations.
  • Utilizing semiconductor photocatalyst systems like CdSe@CdS core-shell quantum dots and CdSe@CdS seeded nanorods.
  • Studying the two-electron photoreduction of platinum and palladium precursors as model reactions.

Main Results:

  • Plasmonic antennas effectively amplified biexciton generation in semiconductor nanocrystals.
  • Photocatalyzed two-electron reactions showed improved yields and kinetics in the presence of the plasmonic antenna.
  • Demonstrated minimization of undesirable back reaction pathways through multiexciton harvesting.

Conclusions:

  • Harvesting charge carriers from multiexcitonic states significantly enhances photocatalytic efficiency.
  • Plasmonic near-field enhancement offers a novel strategy for amplifying photocatalytic activity.
  • This approach holds potential for significant advancements in solar fuel production.