High‐Efficient Visible‐Light Response and Photoelectrochemical Performance of Nanotube‐Sheet Composite Fabricated by Ultrathin Porphyrin Nanosheet and TiO2 Nanotubes

Abstract Here we report a high‐efficiency visible‐light responsive tube‐sheet nanocomposite (Zn‐TCPP NS/TNTs) fabricated by an improved hydrothermal method. The characterization results give deep insights into the structures and interaction between the TNTs and Zn‐TCPP NS. The composites consisting of 5% Zn‐TCPP NS show a marvelous photocatalytic performance for the initial high concentration MB solution (30 mg/l) under visible light, which was about 2 times more than that of the pure TNTs. The electrochemical impedance spectroscopy of the 5% Zn‐TCPP NS/TNTs composites are obviously lower than that of the 1% Zn‐TCPP NS/TNTs composites and pure TNTs, and the photocurrent of the 5% Zn‐TCPP NS/TNTs composites is 3.8 times than the pure TNTs. The reason is that,on one hand, the TNTs can be activated by sun light, and generate photoexcited electron‐hole pairs, which can react with H 2 O and O 2 to produce ⋅OH and ⋅O 2 − radicals, resulting in degradation of waste water. On the other hand, the reaction scheme has a little changed when the TNTs modified by Zn‐TCPP NS.