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Covalent Networking of a Conjugated-Polymer Photocatalyst to Promote Exciton Diffusion in the Aqueous Phase for Efficient Hydrogen Production

Title
Covalent Networking of a Conjugated-Polymer Photocatalyst to Promote Exciton Diffusion in the Aqueous Phase for Efficient Hydrogen Production
Author(s)
An, SanghyeokHassan, Syed ZahidJung, Jin-WooCha, HyojungCho, Chang-HeeChung, Dae Sung
DGIST Authors
An, SanghyeokHassan, Syed ZahidJung, Jin-WooCha, HyojungCho, Chang-HeeChung, Dae Sung
Issued Date
2022-04
Type
Article
Author Keywords
conjugated polymer nanoparticleshydrogen evolutionorganic semiconductorsphoto-crosslinkingphotocatalysts
Keywords
WATERENERGYDOTSNANOMATERIALSEVOLUTIONDESIGN
ISSN
2366-9608
Abstract
A conjugated polymer particle in an aqueous phase is covalently networked in 3D by crosslinking with azide groups, leading to significantly enhanced activity—a high photocatalytic H2 evolution rate (11 024 µmol g−1 h−1 (λ > 420 nm)) and a high apparent quantum yield (up to 0.8%). The reaction between the photoactive azide and the alkyl chains of the conjugated polymer provides more intact intermolecular polymeric interactions in the colloidal state, thus preventing physical swelling and inhibiting the recombination of photoproduced carriers. The covalent network efficiently promotes exciton diffusion, which greatly facilitates charge separation and transfer. The azide photo-crosslinking also leads to more compact and better-packed nanoparticles in the aqueous phase and efficient transfer of excitons to the outer surface of the nanoparticles, where photocatalytic reactions occur. These results show that photo-crosslinking can suppress the adverse effects of alkyl chains which inhibit photocatalytic performance. Therefore, covalent crosslinking is a promising strategy for the development of solar and hydrogen energy. © 2022 Wiley-VCH GmbH
URI
http://hdl.handle.net/20.500.11750/16503
DOI
10.1002/smtd.202200010
Publisher
Wiley-VCH Verlag
Related Researcher
  • 조창희 Cho, Chang-Hee 화학물리학과
  • Research Interests Semiconductor; Nanophotonics; Light-Matter Interaction
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Appears in Collections:
Department of Physics and Chemistry Future Semiconductor Nanophotonics Laboratory 1. Journal Articles

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