Visible-light photoelectrocatalytic degradation of rhodamine B over planar devices using a multi-walled carbon Nanotube-TiO2 composite

Planar devices were prepared via immobilizing multiwalled carbon nanotubes (MWCNTs) and titanium dioxide (TiO2) sequentially on a glass substrate precovered with double symmetric-striped indium tin oxide (ITO) electrodes, which were denoted as the composite device of ITO/MWCNTs-TiO2/ITO. The MWCNTs-TiO2 composite film was grown into a bulk heterojunction structure, thereby offering the efficient exciton dissociation and charge transport. Compared with the blank device of ITO/TiO2/ITO, the composite device of ITO/MWCNTs-TiO2/ITO exhibited a much stronger visible response and promoted photo-electrocatalytic (PEC) degradation of rhodamine B 9.6 times under visible light irradiation. In addition, the composite device remained stable while performing PEC degradations of rhodamine B five times.