氮化碳
光催化
材料科学
异质结
化学工程
纳米颗粒
氮化物
催化作用
吸附
纳米技术
化学
光电子学
有机化学
图层(电子)
工程类
作者
Gongjie Chen,Ziruo Zhou,Bifang Li,Xiahui Lin,Can Yang,Yuanxing Fang,Wei Lin,Yidong Hou,Guigang Zhang,Sibo Wang
标识
DOI:10.1016/j.jes.2023.05.028
摘要
Highly crystalline carbon nitride polymers have shown great opportunities in overall water photosplitting; however, their mission in light-driven CO2 conversion remains to be explored. In this work, crystalline carbon nitride (CCN) nanosheets of poly triazine imide (PTI) embedded with melon domains are fabricated by KCl/LiCl-mediated polycondensation of dicyandiamide, the surface of which is subsequently deposited with ultrafine WO3 nanoparticles to construct the CCN/WO3 heterostructure with a S-scheme interface. Systematic characterizations have been conducted to reveal the compositions and structures of the S-scheme CCN/WO3 hybrid, featuring strengthened optical capture, enhanced CO2 adsorption and activation, attractive textural properties, as well as spatial separation and directed movement of light-triggered charge carriers. Under mild conditions, the CCN/WO3 catalyst with optimized composition displays a high photocatalytic activity for reducing CO2 to CO in a rate of 23.0 µmol/hr (i.e., 2300 µmol/(hr*g)), which is about 7-fold that of pristine CCN, along with a high CO selectivity of 90.6% against H2 formation. Moreover, it also manifests high stability and fine reusability for the CO2 conversion reaction. The CO2 adsorption and conversion processes on the catalyst are monitored by in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), identifying the crucial intermediates of CO2*−, COOH* and CO*, which integrated with the results of performance evaluation proposes the possible CO2 reduction mechanism.
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