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Covalent-organic framework based Z-scheme heterostructured noble-metal-free photocatalysts for visible-light-driven hydrogen evolution

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Abstract

The construction of a Z-scheme heterostructured system is an effective way to improve the separation of photogenerated electrons–holes and the hydrogen evolution activity of photocatalysts. In this work, for the first time, we report a class of covalent-organic framework (COF) based Z-scheme heterostructured hybrids for efficient visible-light-driven photocatalytic hydrogen evolution. An excellent visible-light harvesting COF, TpPa-2-COF, was chosen to integrate with α-Fe2O3 for the construction of Z-scheme hybrids. As a result, the α-Fe2O3/TpPa-2-COF (3 : 7) hybrid material shows an optimal hydrogen evolution rate of 3.77 mmol h−1 g−1 without the participation of any noble metal co-catalyst. This hydrogen evolution rate is about 53 times higher than that of the parent TpPa-2-COF under the same conditions and comparable to that with a Pt (2 wt%) co-catalyst. Further investigations confirm that the tight integration of α-Fe2O3 and 2D COFs can effectively promote the transfer of photogenerated electrons from the CB of α-Fe2O3 to the VB of COFs thus leading to an efficient separation of photogenerated charges of the COF and a greatly enhanced photoactivity. Considering the first report of the COF-based Z-scheme heterostructure as a noble-metal-free photocatalyst for efficient hydrogen evolution, this work may open a new pathway for the further design and synthesis of COF-based hybrid photocatalysts for efficient H2 evolution.

Graphical abstract: Covalent-organic framework based Z-scheme heterostructured noble-metal-free photocatalysts for visible-light-driven hydrogen evolution

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Supplementary files

Article information


Submitted
24 Nov 2019
Accepted
21 Jan 2020
First published
23 Jan 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Covalent-organic framework based Z-scheme heterostructured noble-metal-free photocatalysts for visible-light-driven hydrogen evolution

Y. Zhang, H. Tang, H. Dong, M. Gao, C. Li, X. Sun, J. Wei, Y. Qu, Z. Li and F. Zhang, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA12870K

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