Electrochemical and photoelectrocatalytic properties of TaWO6 nanosheet film

TaWO 6 nanosheet was assembled into multilayer films by a layer-by-layer deposition technology with polyethylenimine as the linker. UV–vis absorption spectra in the assembly process showed a linear enhancement of absorbance at 238   nm per deposition cycle, indicating the successful formation of multilayer composite films, which were converted into polymer-free films by the heat treatment at 400   °C for 2   h. The bandgap energy and flatband potential of TaWO 6 nanosheet were estimated to be 3.48   eV and −0.79   V vs. Ag/AgCl, respectively. The photoelectrocatalytic degradation of Rhodamine B with the TaWO 6 nanosheet electrodes demonstrated that both the oxygen anionic radicals and the dye cationic radical are essential to mineralize the dye under visible-light-driven photocatalytic conditions. It is the first time to investigate the mechanism of photoelectrocatalysis of TaWO 6 nanosheet electrode.