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Boosting the photo-induced charge transfer in melon by lengthening the melon chains through a facile regrowth approach

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Nano Research 2023年第2期16卷 2076-2084页

作者： Tongtong Li Shulan Wang Li Li Xiaohua Yu Huaze Zhu Ningdong Feng Ju Rong Yongqiang Yang Gang Liu Department of Chemistry College of ScienceNortheastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China School of Metallurgy Northeastern UniversityShenyang 110819China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics Wuhan Center for Magnetic Resonance Key Laboratory of Magnetic Resonance in Biological SystemsWuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China

melon-derived carbon nitride photocatalysts are a kind of star layered materials applied in solar energy conversion.With in-planeπorbitals of the heptazine subunits and their overlap along the melon chains being the most distinctive feature,the condition of melon chains is of great importance for the atomic and energy band structures of carbon nitride photocatalysts as well as their photo-activities.In principle,fragmentized melon chains in practical carbon nitride would lead to unfavorable structure disorder both in longitudinal and vertical directions,thus inhibiting the efficient transfer for photo-induced electrons and holes,respectively.Here,with a facile regrowth approach,that is to treat carbon nitride under the atmosphere containing C/N species,the melon chains in carbon nitride were experimentally lengthened,which was reflected by the regularly fraction variation of different nitrogen species derived from X-ray photoelectron spectroscopy(XPS)analysis.The prolonged melon chains led to dramatically improved in-plane structure order and boosted transfer of photo-induced electrons and holes,which were confirmed by the spontaneous photo-deposition of oxidants and reductants.The combination of this regrowth approach with homogenously distributed nitrogen vacancies resulted in much enhanced visible-light-responsive photoactivities.Besides,control experiments using nitrogen-vacancy-free carbon nitride and different C/N-contained precursors showed the compatibility as well as the critical factors for the lengthening effects of the regrowth approach.We hope that the facile but efficient regrowth approach could be widely adopted in melon-derived carbon nitride photocatalysts used for various applications.

关键词： carbon nitride melon chains structure order photocatalytic hydrogen evolution charge transfer charge separation

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