Construction of Double S‐Scheme ZIF‐67@GDY/CuI Heterojunction by Graphdiyne (g‐CnH2n−2) Nanosheets‐Coated ZIF‐67 on Synergized Charge Transfer for Enhanced Photocatalytic Hydrogen Evolution

Author:

Shao Yifan1,Hao Xuqiang1ORCID,Jin Zhiliang1

Affiliation:

1. School of Chemistry and Chemical Engineering Ningxia Key Laboratory of Solar Chemical Conversion Technology, Key Laboratory for Chemical Engineering and Technology State Ethnic Affairs Commission North Minzu University Yinchuan 750021 P. R. China

Abstract

Graphdiyne (GDY) is a carbon allotrope material composed of sp and sp2 hybrid carbon atoms, which has been proven to be a good carrier for anchoring metal catalysts due to its abundant alkyne bonds. Herein, a double S‐scheme ZIF‐67@GDY/CuI heterojunction with graphdiyne (g‐CnH2n−2) nanosheets‐coated ZIF‐67 is prepared by a simple mixing method. The ZIF‐67 dodecahedron coated with GDY nanosheets constructed S‐scheme heterojunction by matching valence and conduction bands. The double S‐scheme heterojunction can maintain the strong redox ability of photogenerated electron–hole pairs well and promote more efficient charge transport. The excellent charge transport path is also attributed to the unique double S‐scheme heterojunction, which is confirmed by in situ X‐ray photoelectron spectroscopy. Moreover, the electron migration from ZIF‐67 to GDY generates an internal electric field (IEF), which improves the light energy utilization and charges separation efficiency under the condition of the IEF, band edge bending, and coulomb interaction. The optimal hydrogen production rate of ZIF‐67@GDY/CuI‐20 is 7.27 mmol g−1 h−1 under visible light irradiation, which is significantly increased by 4.75 times compared with the unmodified ZIF‐67. Herein, a new possibility for the construction of double S‐scheme heterojunction based on graphdiyne to improve photocatalytic performance is provided.

Funder

Natural Science Foundation of Ningxia Province

Publisher

Wiley

Subject

Electrical and Electronic Engineering,Energy Engineering and Power Technology,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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