Construction of intramolecular and interfacial built-in electric field in a donor-acceptor conjugated polymers-based S-scheme heterojunction for high photocatalytic H2 generation
Engineering a robust built-in electric field(IEF)is favorable for boosting carrier separation and achieving high photocatalytic performance.Herein,we developed a donor-acceptor conjugated polymer-based S-scheme heterojunction,utilizing both intramolecular and interfacial IEF to en-hance carrier separation and achieve superior photocatalytic performance.Specifically,the intra-molecular IEF was established by introducing 1,6-dibromopyrene into carbon nitride(CN)to form 1,6-dibromopyrene grafted CN(CNPy).Concurrently,the S-scheme heterojunction was formed by coupling CNPy with CdSe nanoparticles to create an interfacial IEF.Experimental findings demon-strated that the combined effect of intramolecular and interfacial IEF within the CdSe/CNPy het-erojunction significantly improved the carrier separation and retained strong redox capacity.Bene-fiting from these advantages,the optimized composite,100％CdSe/CNPy-0.2,showed the highest H2 generation rate of 1.16 mmol g-1·h1,surpassing those of pure CNPy-0.2,CdSe and 100％CdSe/CN by 58,2.2 and 2.32 times,respectively.This study introduces an innovative design strategy for IEF-regulated conjugated polymer-based materials,paving the way for efficient solar-to-chemical energy conversion.
g-C3N4Intramolecular built-in electric fieldInterfacial built-in electric fieldS-Scheme heterostructurePhotocatalyst
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