Two-dimensional organic skeleton material (2D·COF) has attracted extensive attention in the field of photocatalytic total water hydrolysis. They have the advantages of adjustable chemical composition, high porosity and high crystallinity, so that electrons and holes can be quickly separated under illumination and undergo reduction and oxidation reactions respectively. However, the poor electron transfer ability from photosensitizer to active site is still one of the important factors restricting the development of 2D COF materials. In order to solve this problem, scientists at Fudan University used viologen as an electron transfer mediator and integrated it into 2D COF materials through quaternization reaction, which greatly improved the activity and stability of photocatalytic hydrogen production. Related results were published in the top periodical Angew. Chemistry. In the field of chemistry, the influence factor is 12.257.

The above picture shows the synthesis process of this material. After loading a certain amount of Pt as cocatalyst, hydrogen can be generated stably and efficiently.

The visible light absorption ability of the material was studied by ultraviolet-visible diffuse reflectance spectroscopy. The absorption capacity is above 650nm, the hydrogen production rate of the best sample is as high as 350 μm ol/h, and it still maintains high activity after six consecutive tests, which proves that the material has excellent stability.

Through a series of performance tests, it is shown that the synthesized samples have good photo-induced charge separation ability.

Article link: https://doi.org/10.1002/Anie.20201618.