In‐situ Chemical Bonded Tubular Titanium Dioxide With Covalent Organic Frameworks Promoted Photocatalytic Activity

Abstract Solar driven water splitting to produce hydrogen is an ideal way to generate renewable energy, however, there is still a challenge of photo generated charge recombination. Herein, on the basis of unique tubular titanium dioxide (TiO 2 ), covalent organic frameworks (COFs) are grown in situ and linked through chemical bonds to obtain heterojunction materials. The results show that when the Schiff base covalent organic frameworks (COF‐1) loading is 30% (30% COF‐1/TiO 2 ), the photocatalytic hydrogen evolution rate (HER) of the composite material is as high as 31.9 mmol/g/h, which was twice that of the original TiO 2 and 2.6 times that of the original COF‐1. Experimental characterization demonstrates that the tubular heterojunction (COF‐1/TiO 2 ) can improve the migration of electron‐hole pairs and enhance the utilization efficiency of charge carriers. This provides new insights into the design of efficient photocatalytic materials.