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The Other Dimension-Tuning Hole Extraction via Nanorod Width.

Tal Rosner1, Nicholas G Pavlopoulos1, Hagit Shoyhet1

  • 1Schulich Faculty of Chemistry, The Russell Berrie Nanotechnology Institute, The Nancy and Stephen Grand Technion Energy Program, Technion-Israel Institute of Technology, Haifa 32000, Israel.

Nanomaterials (Basel, Switzerland)
|October 14, 2022
PubMed
Summary

Optimizing nanorod shell width enhances solar-to-hydrogen production. Precise control over cadmium sulfide (CdS) shell dimensions in cadmium selenide (CdSe) nanorods improves photocatalytic efficiency and stability for clean fuel generation.

Keywords:
hole extractionhydrogenphotocatalysisseeded rodssemiconductor nanorodstransient absorption

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Renewable Energy

Background:

  • Solar-to-hydrogen generation offers a clean, renewable fuel source.
  • Nanohybrid structures like CdSe@CdS-Pt nanorods show high photon-to-hydrogen efficiency but struggle with overall water splitting.
  • Limited hole extraction from the semiconductor hinders photocatalyst activity and stability.

Purpose of the Study:

  • To investigate the effect of CdS shell width on hole extraction and photocatalytic activity in CdSe@CdS nanorods.
  • To verify the hypothesis that tuning nanorod dimensions can improve hole extraction rates.
  • To explore the relationship between nanorod diameter and hydrogen production efficiency.

Main Methods:

  • Achieving atomic-scale control over the width of CdSe@CdS nanorods.
  • Systematically varying the CdS shell diameter around the CdSe core.
  • Evaluating the impact of shell width on hole quenching and photocatalytic H2 production.

Main Results:

  • Demonstrated atomic-scale control over CdSe@CdS nanorod shell width.
  • Revealed a non-monotonic effect of nanorod diameter on photocatalytic activity.
  • Identified an optimal CdS shell width for enhanced hole extraction and H2 production.

Conclusions:

  • Tuning the CdS shell width in CdSe@CdS nanorods is crucial for optimizing solar-to-hydrogen conversion.
  • The study provides insights into the mechanism of hole extraction and its influence on photocatalyst performance.
  • Findings guide the future design of efficient and stable nanoscale photocatalysts for renewable fuel production.