The global energy crisis is exacerbated by the continuous consumption of fossil fuels during the rapid development of modern industries. In addition, the survival and development of human beings is also being seriously affected by the emission of greenhouse gases.
The successful implementation of photosynthesis depends on the design of photocatalysts. Inorganic semiconductors have been extensively studied for COphotoreduction reaction , which presents shortcomings. For example, the band gaps of metal oxides and metal chalcogenides are difficult to adjust, resulting in poor light absorption.
Photocatalysts based on porous organic frameworks have attracted tremendous interest owing to their facile bandgap and charge separation tunability via designable functional building blocks. Nevertheless, a considerable portion of previously reported POFs still rely on the metal reactive sites.
A research team led by Prof. Yong Yang from Nanjing University of Science and Technology and Prof. Yong Zhou from Nanjing University, China, reported a series of three-dimensional Tröger's base-derived porous aromatic frameworks ) featuring designated reaction sites and unique charge transfer properties.
In the absence of cocatalysts and sacrificial agents, TEPE-TB-PAF presents a competitive CO formation rate with near-unity selectivity . Significantly, the low energy barrier for CO desorption and high energy barrier for *CHO formation commonly contribute to the high efficiency of TEPE-TB-PAF, which is demonstrated by computational explorations and in-situ diffuse reflectance infrared Fourier transform spectra.
This work provides efficient building blocks for the synthesis of multifunctional organic photocatalysts and a ground-breaking insight for the simultaneous enhancement of photocatalytic reactivity and selectivity.
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