期刊
JOURNAL OF MATERIOMICS
卷 6, 期 1, 页码 128-137出版社
ELSEVIER
DOI: 10.1016/j.jmat.2020.01.006
关键词
Molecular self-assembly; g-C3N4; Porous structure; Nitrogen vacancies; Photocatalytic nitrogen fixation
资金
- National Natural Science Foundation of China [51872173, 51772167]
- Taishan Scholarship of Young Scholars
- Taishan Scholarship of Climbing Plan [tspd20161006]
- Key Research and Development Program of Shandong Province [2018GGX102028]
- Natural Science Foundation of Shandong Province [ZR2017JL020]
- Higher School Youth Innovation Team of Shandong Province [2019KJA013]
The porous few-layer g-C3N4 (PFL-g-C3N4) is prepared by a simple molecular self-assembly method. Compared with pure g-C3N4, the as-prepared PFL-g-C3N4 is ultrathin, the surface is rich in pores, and the photocatalytic nitrogen fixation activity is greatly increased to 8.20 mM h(-1) gCat(-1). Few-layer and ultrathin nature of PFL-g-C3N4 can provide a larger specific surface area, expose more active sites, and reduce the diffusion path of charges and protons from the inside to the surface. In addition, the porous structure can narrow the band gap, thereby increasing the light absorption range and enhancing the light absorption capability. Meanwhile, the presence of nitrogen vacancies causes PFL-g-C3N4 to move to a more negative conductive band value. More importantly, the isotopic experiments using N-15(2) as nitrogen source confirm the ammonia production originating from N-2 rather than the decomposition of g-C3N4. Therefore, PFL-g-C3N4 can greatly improve the efficiency of visible light photocatalytic nitrogen fixation. (c) 2020 The Chinese Ceramic Society. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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