MoS2/Au-Sensitized TiO2 Nanotube Arrays with Core-Shell Nanostructure for Hydrogen Production

摘要

Herein, a TiO2 NTAs-Au-MoS2 coreshell photoanode was constructed with the intention to fulfill the efficient transfer of photo-generated carriers to the photoelectrode's surface. Au nanoparticles were decorated by a drop casting method, and the MoS2 layer was deposited above the Au nanoparticles using a photoreduction-annealing process. Au nanoparticles were well dispersed on the inner wall of the TiO2 nanotubes and covered by the MoS2 layer, forming a coreshell nanostructure. The MoS2 layer significantly improved the attachment between Au nanoparticles and TiO2 NTAs, resulting in increased PEC stability and performance. Attributed to the excitation of Au nanoparticles localized surface plasmon resonance effect and visible light utilization of MoS2, the TiO2 NTAs-Au-MoS2 coreshell photoanode exhibits greatly enhanced photocurrent density. An increase from 67 mu A/cm(2) to 234 mu A/cm(2) under Xe lamp illumination and from 2.6 mu A/cm(2) to 12.6 mu A/cm(2) under visible light illumination (lambda > 420nm) compared with the TiO2 NTAs was observed