Two-dimensional (2D) layered nanocomposite provides a surface-to-surface heterojunction, which is an effective way to improve the photocatalytic performance because larger contact areas can promote the separation rate of interfacial charge carriers. In this study, Co­(OH)2/g-C3N4/Ni­(OH)2 2D layered photocatalysts have been successfully synthesized through a simple precipitation–hydrothermal method. The composite achieves a high H2-production rate of 899 μmol·h–1·g–1, which exceeds the rate of samples only coupled with Co­(OH)2 and Ni­(OH)2 by 4.0 and 1.9 times, respectively. In addition, the activity is even higher than that of the optimized Pt-g-C3N4 sample (1 wt. % Pt–C). The characterization results reveal the close contact of g-C3N4 and Ni/Co hydroxides, and such a face-to-face contact can greatly improve the interfacial charge-transfer rate, resulting in a high photocatalytic performance. This work demonstrates a simple way to enhance the photocatalytic H2 production of g-C3N4 under the cooperative effect of Co­(OH)2 and Ni­(OH)2 and provides novel insights into constructing other 2D ternary heterostructure nanocomposites.

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Nitric acid is considered to be an important chemical raw material, however, the traditional production of nitric acid is an energy-intensive process. Photocatalysis provides an ideal way to oxidize nitrogen...

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