期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 256, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.117867
关键词
g-C3N4 nanosheets; Hydrogen evolution; Ultrafast spectroscopy; Water splitting; Supramolecular assembly
资金
- Six Talent Peaks Project in Jiangsu Province [2015-XCL-026]
- Natural Science Foundation of Jiangsu Province [BK20171299]
- Start-Up Fund from Nanjing Forestry University
- State Key Laboratory of Photocatalysis on Energy and Environment [SKLPEE-KF201705]
- Fuzhou University
- National Natural Science Foundation of China [51672113]
- QingLan Project of Jiangsu Province
Two-dimensional graphitic carbon nitride (2D g-C3N4) nanostructures have been the focus of substantial research interest recently owing to their promising photoactive properties for use in solar-to-fuel conversion. However, the synthesis of 2D g-C3N4 nanomaterials remains a significant challenge. Here we successfully synthesized 2D g-C3N4 nanosheets via a supramolecular chemistry approach. 2D g-C3N4 nanostructures not only enhance the visible light-harvesting property but also provide more catalytic sites for improved hydrogen evolution reaction (HER). More importantly, we describe experimental findings concerning the dynamics of charge and energy transfer by using ultrafast spectroscopy in combination with in-situ electron spin resonance (ESR) characterization. The mechanistic investigation reveals that the introduction of a benzene-substituted melamine motif can remarkably accelerate the electron-hole separation and suppress the recombination of photogenerated charge carriers. The carrier separation dynamics is expected to be tailored by engineering the surface and morphology of g-C3N4, which favors enhanced solar photocatalytic HER efficiency.
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