Microwave awakening the n-π* electronic transition in highly crystalline polymeric carbon nitride nanosheets for photocatalytic hydrogen generation |
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作者姓名: | Xiangang Lin Haiwei Du Daochuan Jiang Peng Zhang Zhiwu Yu Hong Bi Yupeng Yuan |
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作者单位: | School of Chemistry and Chemical Engineering;Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Anhui University);High Magnetic Field Laboratory;School of Materials Science and Engineering |
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基金项目: | financially supported by the National Natural Science Foundation of China (52072001, 51872003, U1832148 and U1932218);the Anhui Provincial Natural Science Foundation (1908085J21 and 1908085QB83)。 |
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摘 要: | The n-π* electronic transition in polymeric carbon nitride(PCN)can remarkably harvest visible light,which thus potentially promotes the photocatalytic hydrogen H2 generation.However,awaking the n-π* lectronic transition has proven to be a grand challenge.Herein,we reported on the awakening of n-π* electronic transition by microwave thermolysis of urea pellet,which yielded the PCN with absorption edge of 600 nm,near 140 nm red-shift from 460 nm of pristine PCN.The n-π* electronic transition endows PCN with an increased photocata lytic H2 generation,with a highest H2 rate of 61.7μmol h-1 under visible light exposure,which is near 6 times higher than that by using the PCN from the thermolysis of urea pellets in an electric furnace(10.6μmol h-1).Furthermore,the n-π* transition in PCN leads to the longest wavelength of 535 nm that can initiate H2 generation,remarkably longer than the absorption edge of pristine PCN(460 nm).This work manifests the advantages of microwave sintering route to awaken the n-π* electronic transition in PCN for an increased photocata lytic performance.
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关 键 词: | Polymeric carbon nitride MICROWAVE n-π*electronic transition Hydrogen |
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