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In Situ Synthesis of CdS/Graphdiyne Heterojunction for Enhanced Photocatalytic Activity of Hydrogen Production.

Hydrogen production through artificial photosynthesis has been regarded as a promising strategy for dealing with energy shortage and environmental problems. In this work, graphdiyne (GD) was first introduced to the visible-light catalytic system for hydrogen production, in which a CdS/GD heterojunction was prepared through a simple in situ growth process by adding Cd(AcO)2 into a dimethyl sulfoxide (DMSO) solution containing GD substrate. The as-prepared CdS/GD heterojunction exhibits much higher performance for photocatalytic hydrogen evolution compared to that of pristine GD and CdS nanoparticles. The photocatalytic performance of CdS/GD heterostructure containing 2.5 wt % of GD (GD2.5) is 2.6 times higher than that of the pristine CdS nanoparticles. The enhanced catalytic performance can be ascribed to the formation of CdS/GD heterojunction, in which the presence of GD can not only stabilize CdS nanoparticles by preventing the agglomeration of CdS nanoparticles but also act as a photogenerated hole transfer material for efficiently separating photogenerated electron-hole pairs in CdS. Accordingly, this work provides the potential of GD-derived materials for solar energy conversion and storage.

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