Journal
CHINESE JOURNAL OF CHEMISTRY
Volume 41, Issue 2, Pages 173-180Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.202200445
Keywords
Photocatalysis; Water splitting; 2D/2D heterojunction; g-C3N4; Energy conversion; Charge transfer; Nanosheet; photocatalyst
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This study demonstrates the construction of a two-dimensional heterostructure photocatalyst, which significantly improves the photocatalytic activity. The two-dimensional heterostructure is achieved through a simple in-situ phosphorization treatment, and exhibits excellent structural stability and photocatalytic performance.
Heterojunction design in a two-dimensional (2D) fashion has been deemed beneficial for improving the photocatalytic activity of g-C3N4 because of the promoted interfacial charge transfer, yet still facing challenges. Herein, we construct a novel 2D/2D Cu3P nanosheet/P-doped g-C3N4 (PCN) nanosheet heterojunction photocatalyst (PCN/Cu3P) through a simple in-situ phosphorization treatment of 2D/2D CuS/g-C3N4 composite for photocatalytic H-2 evolution. We demonstrate that the 2D lamellar structure of both CuS and g-C3N4 could be well reserved in the phosphorization process, while CuS and g-C3N4 in-situ transformed into Cu3P and PCN, respectively, leading to the formation of PCN/Cu3P tight 2D/2D heterojunction. Owing to the large contact area provided by intimate face-to-face 2D/2D structure, the PCN/Cu3P photocatalyst exhibits significantly enhanced charge separation efficiency, thus achieving a boosted visible-light-driven photocatalytic behavior. The highest rate for H-2 evolution reaches 5.12 mu mol & BULL;h(-1), nearly 24 times and 368 times higher than that of pristine PCN and g-C3N4, respectively. This work represents an excellent example in elaborately constructing g-C3N4-based 2D/2D heterostructure and could be extended to other photocatalyst/co-catalyst system.
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