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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
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.
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.
