Photoelectrochemical water oxidation over TiO2 nanotubes modified with MoS2 and g-C3N4

TiO2 nanotube arrays (TNAs) have been studied for photoelectrochemical (PEC) water splitting. However, there are two major barriers of TNAs, including a low photo-response and the fast charge carrier recombination in TNAs, leading to poor photocatalyt-ic efficiency. Through a comparison of MoS2/TNAs and g-C3N4/TNAs, it was found that TNAs modified with MoS2 and g-C3N4 exhibited a current density of, respectively, 210.6 and 139.6 mu A center dot cm-2 at an overpotential of 1.23 V vs RHE, which is 18.2 and 12 times higher than that of pure TNAs under the same conditions. The stability of the MoS2/TNAs heterojunction is higher than that of g-C3N4/TNAs.

Automated summary

Through the modification of MoS2 and g-C3N4 on TiO2 nanotube arrays, the photoelectrochemical water splitting efficiency and current density can be significantly improved. The stability of MoS2/TNAs heterojunction is higher than that of g-C3N4/TNAs.