Abstract
Rational design of nanostructures of heterogeneous photocatalysts is important to improve their performance and stability. In this study, 3D flower spherical ZnCdS/CuS/Cu9S5 with a double p-n heterojunction tandem heterojunction mechanism was designed and constructed for the first time by solvothermal method and physical mixing process. The construction of the double p-n heterojunction system promotes the electron-hole separation of charges. The 3D flower spherical structure is formed, which not only possesses superior dispersion and slows down the agglomeration, but also can provide channels for charge transport and promote the reaction. Benefiting from the special flower sphere-like surface structure and the synergistic effect between CuS/Cu9S5 and ZnCdS, the optimized 3D ZnCdS/CuS/Cu9S5 nanocomposites show a high H2 evolution rate of 694.1 μmol after 5 h of light exposure, which is 6 times higher than that of the pristine ZnCdS material. Meanwhile, the optimal sample exhibited an apparent quantum efficiency of 8.87% at 475 nm and good stability under 20 h of irradiation. This work provides a new idea for the design of efficient spatially separated and synergistic double p-n heterojunctions photocatalysts for H2 production.
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