Enhanced photoelectronic performance of MoS2 nanosheets decorated TiO2 nanotube arrays via simultaneously promoting light absorption and charge separation

Both light absorption and charge separation are highly important to the photoelectronic performance of semiconductor-based electrodes. Herein, we describe the fabrication of -TiO2 nanotube arrays (NTAs) decorated with dual-functional molybdenum disulfide -(MoS2) nanosheets using a facile hydrothermal method. The obtained -MoS2/TiO2 heterojunction shows a high photocurrent density of 0.76 mA -cm(-2) at 1.23 -VRHE (V vs. the reversible hydrogen electrode), which is over five times higher than that of pristine -TiO2 NTAs. The enhanced photoelectronic performance is mainly attributed to the synergistic effect between the extended light absorption and improved charge separation after the introduction of -MoS2 nanosheet. This simple yet general strategy provides a unique platform to improve the catalytic activity of photoelectrode materials with a narrow band-gap.