Layered MoS2 nanoparticles on TiO2 nanotubes by a photocatalytic strategy for use as high-performance electrocatalysts in hydrogen evolution reactions†
An environmentally-friendly photocatalytic strategy carried out at room temperature and atmospheric pressure without using toxic precursors was used to develop high-performance MoS2 nanoparticulate electrodes consisting of layered MoS2 nanoparticles on anodized TiO2 nanotubes (TiO2-NTs). TiO2-NTs were used as a substrate for MoS2 growth because of their strong photocatalytic activity and large surface area. Photocatalysis of the TiO2-NTs was used to reduce the (NH4)2MoS4 precursor into MoS2 nanoparticles. By elaborately designing the microstructure of the TiO2-NTs, MoS2 nanoparticles on TiO2-NTs can demonstrate a high electrocatalytic activity in hydrogen evolution reactions (HERs) with an onset overpotential of −0.14 V (vs. SHE) and a Tafel slope of ∼52 mV dec−1. This indicates that our photocatalytic strategy is highly efficient for preparing high-activity MoS2 nanoparticulate electrodes.