Heterostructured ZnFe(2)O(4)/TiO(2) nanotube arrays with remarkable visible-light photoelectrocatalytic performance...

A series of heterostructured ZnFe₂O₄/TiO₂-nanotube arrays (NTAs) with remarkable visible-light photoelectrocatalytic (PEC) activity were successfully prepared via a two-step process of anodization and impregnation, followed by annealing. The structure and morphology of the as-prepared ZnFe₂O₄/TiO₂-NTAs samples, PEC degradation abilities and photoelectrochemical performances, as well as long-term stabilities toward degradation of methyl orange (MO) solution under visible-light irradiation were deeply investigated. Results showed that forming a heterojunction by combination of TiO₂-NTAs with ZnFe₂O₄ successfully extended the absorption edge of TiO₂-NTAs to visible-light region. Among all the ZnFe₂O₄/TiO₂-NTAs samples, the 2-ZnFe₂O₄/TiO₂-NTAs sample, named ZT(2), obtained the best PEC activity and the highest photocurrent density under visible-light irradiation. Moreover, the ZT(2) sample retained a good reproducibility and high stability after 20days of PEC degradation. The outstanding visible-light PEC activity and photocurrent response of the ZT(2) sample were attributed to the proper amount of ZnFe₂O₄ nanoparticles loaded onto the TiO₂-NTAs, which not only dramatically improved the visible-light absorption of TiO₂-NTAs, but also assisted the separation of photo-induced electron-hole pairs and reduced their recombination by forming a ZnFe₂O₄/TiO₂-NTAs heterojunction. The reaction mechanism responsible for the enhanced visible-light PEC performance of the ZnFe₂O₄/TiO₂-NTAs heterostructure was also discussed.