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Size-dependent exciton dynamics in TADF nanoparticles for efficient CO2 photoreduction
Yueqian Jia1,2, Bojun Shi1,2, Shuchun Zhang1,2
1Key Laboratory of Photochemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. chenlily@iccas.ac.cn.
Optimizing nanoparticle size is key for efficient solar CO2 conversion using Thermally Activated Delayed Fluorescence (TADF) nanoparticles. Medium-sized TADF nanoparticles maximize CO production by balancing surface and bulk charge dynamics.
Area of Science:
- Nanomaterials Science
- Photocatalysis
- Renewable Energy
Background:
- Thermally Activated Delayed Fluorescence (TADF) nanoparticles offer potential for solar CO2 conversion due to long-lived excited states.
- Controlling nanoparticle morphology is crucial for optimizing photocatalytic efficiency.
Purpose of the Study:
- To synthesize and characterize TAPC:3TPYMB nanoparticles with controlled sizes.
- To investigate the relationship between nanoparticle size, exciton dynamics, and photocatalytic CO2 conversion efficiency.
Main Methods:
- Mini-emulsion method for nanoparticle synthesis.
- Steady-state and transient absorption spectroscopy for exciton dynamics analysis.
- Solar photocatalytic CO2 reduction experiments under visible light irradiation.
Main Results:
- Optimal CO production was observed for medium-sized nanoparticles (∼133.7 nm), showing a 13-fold enhancement over smaller ones.
- Medium-sized nanoparticles suppressed non-radiative decay and bulk recombination, enhancing photocurrent density and exciton dissociation.
- Nanoparticle size-dependent activity arises from a balance between surface quenching (small particles) and bulk recombination (large particles).
Conclusions:
- A quantitative relationship between nanoparticle size, exciton dissociation, and catalytic activity in TADF-exciplex systems was established.
- Nanoparticle morphology control is a critical design principle for efficient solar fuel production catalysts.
- This study provides insights for developing next-generation nanostructured photocatalysts for solar energy applications.
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