Layered MoS2 coupled MOFs-derived dual-phase TiO2 for enhanced photoelectrochemical performance†
In this work, we demonstrate a facile two-step hydrothermal method to synthesize layered MoS2 coupled metal organic framework (MOF) derived dual-phase TiO2 (MDT), as a photoanode for photoelectrochemical (PEC) water splitting and dye sensitized solar cells (DSSCs). The MOF-derived TiO2 with a controllable pore size effectively prolongs the light traveling length and facilitates the interfacial carrier transport. Coupled with MoS2, the visible light response property and the surface water oxidation kinetics of TiO2 are obviously enhanced. Importantly, the multi-junction between layered MoS2 and dual-phase TiO2 suppresses the recombination rate of photoinduced electron–hole pairs and effectively enhances charge transfer kinetics. Used as a photoanode for DSSCs, the MDT demonstrates a maximum photocurrent density (J) of 17.72 mA cm−2 with a power conversion efficiency (η) of 8.96%, more than 2 times higher than that of pure TiO2 (η = 4.41%). Applied as a photoanode for PEC water splitting, it shows a photocurrent density of 1.2 mA cm−2 at 1.23 V vs. RHE, compared with that of pure TiO2 (J = 0.6 mA cm−2). The greatly improved PEC performance provides methods for building solar energy conversion devices by constructing MOF-derived functional materials.