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Light-driven Enzymatic Decarboxylation
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Two-Dimensional Morphology Enhances Light-Driven H2 Generation Efficiency in CdS Nanoplatelet-Pt Heterostructures
Qiuyang Li1, Fengjiao Zhao2, Chen Qu1
1Department of Chemistry , Emory University , 1515 Dickey Drive, Northeast , Atlanta , Georgia 30322 , United States.
Journal of the American Chemical Society
|August 28, 2018
Summary
Two-dimensional (2D) cadmium sulfide (CdS) nanoplatelet-platinum (Pt) heterostructures significantly boost light-driven hydrogen (H2) generation efficiency. This 2D morphology extends charge-separated state lifetime, outperforming 1D nanostructures.
Area of Science:
- Materials Science
- Photochemistry
- Nanotechnology
Background:
- Semiconductor nanocrystal heterostructures are promising for light-driven hydrogen (H2) generation.
- Current limitations in zero- and one-dimensional nanomaterials include short photoinduced charge-separated state lifetimes, hindering H2 evolution reaction efficiency.
Purpose of the Study:
- To investigate the efficiency of two-dimensional (2D) CdS nanoplatelet (NPL)-Pt heterostructures for H2 generation.
- To understand the role of 2D morphology in enhancing charge separation and H2 evolution.
Main Methods:
- Fabrication of 2D CdS NPL-Pt heterostructures.
- Measurement of H2 generation internal quantum efficiency (IQE) across a range of pH values.
- Time-resolved spectroscopic studies to analyze charge separation and recombination dynamics.
- Computational modeling of elementary charge processes.
Main Results:
- Achieved H2 generation IQE exceeding 40% at pH 8.8-13 and approaching unity at pH 14.7.
- Demonstrated significantly higher IQE for 2D NPL-Pt compared to 1D nanorods at pH < 13.
- Identified extended charge-separated state lifetime in 2D morphology as a key factor for enhanced efficiency.
Conclusions:
- Two-dimensional morphology in CdS NPL-Pt heterostructures enhances light-driven H2 generation efficiency.
- Irreversible hole removal by hydroxide ions (OH-) contributes to near-unity IQE at high pH.
- This work presents a novel strategy for designing advanced nanostructures for efficient solar-to-H2 conversion.
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