CdS/ZnIn2S4/TiO2 3D-heterostructures and their photoelectrochemical properties

Abstract

We describe the synthesis and application of a three-dimensional (3D) CdS quantum dot/ZnIn₂S₄ nanosheet/TiO₂ nanotube array (CdS/ZnIn₂S₄/TiO₂) heterostructured material architecture. TiO₂ nanotube arrays (TiO₂ NTAs) are used as the synthetic template, subsequently sensitized using hydrothermal and successive ion layer adsorption and reaction (SILAR) techniques. The described synthesis approach offers a powerful technique in the design of 3D heterostructure systems. Under AM1.5G illumination, the 3D CdS/ZnIn₂S₄/TiO₂ samples generate a photocurrent of approximately 4.3 mA cm⁻², with a photoconversion efficiency of 2%. Samples are tested for their ability to photocatalytically degrade target agents; it is noteworthy that after 90 min illumination 100% of 2,4-dichlorophenoxyacetic acid (2,4-D) is removed.