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Fast photogenerated electron transfer in N-GQDs/PTI/ZnO-QDs ternary heterostructured nanosheets for photocatalytic H₂ evolution under visible light

journal contribution
posted on 2019-08-15, 00:00 authored by H Zhang, Y Cao, L Zhong, X Cao, J He, J Sun, Weiwei LeiWeiwei Lei
The efficiency of photogenerated charge transport is one of the critical factors determining the photocatalytic performance in heterostructured photocatalysts. In this work, a two-dimensional conjugated polytriazine imide (PTI)-based photocatalyst was developed to achieve fast photoexcited electron transfer. These heterostructured nanosheets were synthesized by a one-pot condensation of a precursor mixture of cyanamide and N-doped graphene quantum dots (N-GQDs)in ZnCl2 containing salt melts. The ionothermal synthetic approach results in the N-GQDs/PTI in-plane heterostructured nanosheets, loaded with well-dispersed ZnO quantum dots (ZnO-QDs). Especially, the N-GQDs are coupled with PTI through the nitrogen atoms at the edge of triazine rings, forming new π-p-π conjugated connection units. Therefore, the obtained ternary heterostructured nanosheets can synchronously promote photoelectron transport through the new π-p-π conjugated networks as well as extend the optical response. Importantly, it exhibits approximately 230 and 3.6 times enhancement of H2 evolution over pure PTI and the PTI/ZnO-QDs heterostructure under visible light irradiation, respectively.

History

Journal

Applied Surface Science

Volume

485

Pagination

361 - 367

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0169-4332

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2019, Elsevier B.V.