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Enhanced photocatalytic hydrogen evolution from organic semiconductor heterojunction nanoparticles
Jan Kosco1, Matthew Bidwell2, Hyojung Cha2
1King Abdullah University of Science and Technology (KAUST), KAUST Solar Center, Physical Sciences and Engineering Division (PSE), Thuwal, Saudi Arabia. jan.kosco@kaust.edu.sa.
Nature Materials
|February 5, 2020
Summary
Researchers developed advanced organic photocatalysts using a donor-acceptor blend in nanoparticles. This innovation significantly boosts hydrogen evolution rates, offering a promising advancement in sustainable energy production.
Area of Science:
- Materials Science
- Photocatalysis
- Organic Electronics
Background:
- Single organic semiconductor photocatalysts exhibit limited charge generation and low activity.
- Organic nanoparticles (NPs) offer potential for enhanced photocatalytic applications.
Purpose of the Study:
- To enhance photocatalytic activity for hydrogen evolution using organic semiconductors.
- To investigate the effect of nanomorphology on photocatalyst performance.
Main Methods:
- Fabrication of organic nanoparticles (NPs) incorporating a donor polymer (PTB7-Th) and non-fullerene acceptor (EH-IDTBR).
- Controlled nanomorphology by varying stabilizing surfactants, transitioning from core-shell to intermixed structures.
- Evaluation of hydrogen (H2) evolution rates and external quantum efficiencies under broad solar illumination.
Main Results:
- Incorporating a donor-acceptor heterojunction in NPs significantly improved photocatalytic activity.
- Altering NP nanomorphology from core-shell to intermixed structures increased H2 evolution by an order of magnitude.
- Achieved a record H2 evolution rate exceeding 60,000 µmol h-1 g-1 and external quantum efficiencies over 6%.
Conclusions:
- Heterojunction engineering in organic NPs is a viable strategy to overcome intrinsic charge generation limitations.
- Nanomorphology control is crucial for optimizing photocatalyst performance in hydrogen evolution.
- These advanced organic photocatalysts demonstrate high efficiency for solar-driven hydrogen production.
