Abstract
As a new member of the carbon family, graphdiyne is an intrinsic semiconductor featuring a natural bandgap, which endues it potential for direct application in photoelectric devices. However, without cooperating with other active materials, conventional hexacetylene-benzene graphdiyne (HEB-GDY) shows poor performances in photocatalysis and photoelectric devices due to its non-ideal visible light absorption, low separation efficiency of the photogenerated carriers and insufficient sites for hydrogen production. Herein, we report a molecular engineering strategy for the regulation of GDY-based carbon materials, by incorporating a strong pyrene absorption group into the matrix of graphdiyne, to obtain pyrenyl graphdiyne (Pyr-GDY) nanofibers through a modified Glaser-Hay coupling reaction of 1,3,6,8-tetraethynylpyrene (TEP) monomers. For comparison, phenyl graphdiyne (Phe-GDY) nanosheets were also constructed using 1,3,4,6-tetraethynylbenzene (TEB) as a monomer. Compared with Phe-GDY, Pyr-GDY exhibits a wider visible light absorption band, promoted efficiency of the charge separation/transport and more sufficient active sites for water reduction. As a result, Pyr-GDY alone displays superior photoelectrocatalytic performance for water splitting, giving a cathode photocurrent density of ~138 μA cm−2 at a potential of −0.1 Vversus normal hydrogen electrode (NHE) in neutral aqueous solution, which is almost ten and twelve times as high as those of Phe-GDY (14 μA cm−2) and HEB-GDY (12 μA cm−2), respectively. Such a performance is also superior to those of most reported carbon-based metal-free photocathode. The results of theoretical calculations reveal that the carbon atoms in the acetylene bonds are the active sites for proton reduction. This work offers a new strategy for the construction of graphdiyne-based metal-free photo-electrocatalysts with enhanced photoelectrocatalytic performance.
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Acknowledgements
This work was supported by the National Key R&D Program of China (2017YFA0700104), the National Natural Science Foundation of China (21790052, 21702146, 21805207) and 111 Project of China (D17003).
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Li, M., Wang, HJ., Zhang, C. et al. Enhancing the photoelectrocatalytic performance of metal-free graphdiyne-based catalyst. Sci. China Chem. 63, 1040–1045 (2020). https://doi.org/10.1007/s11426-020-9763-9
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DOI: https://doi.org/10.1007/s11426-020-9763-9