期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 585, 期 -, 页码 684-693出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.10.048
关键词
Step-scheme heterojunction; Bi12O17Cl2; g-C3N4; Build-in electric field; Photocatalytic CO2 reduction
资金
- National Natural Science Foundation of China [51572103, 51973078]
- Distinguished Young Scholar of Anhui Province [1808085J14]
- Major projects of Education Department of Anhui Province [KJ2020ZD005]
- Key Foundation of Educational Commission of Anhui Province [KJ2019A0595]
Heterostructured photocatalysts, such as the step-scheme porous g-C3N4/Bi12O17Cl2 (PGCN/BOC) nanocomposite, show enhanced photocatalytic performance by promoting interfacial charge migration and shortening the diffusion path of charge carriers. This work provides new insights into constructing novel heterojunctions for photocatalytic CO2 reduction.
Heterostructured photocatalysts are promising candidates in the photocatalysis field, and the heterojunction plays a vital role in the separation of spatial charge carriers. Here, a heterojunction was fabricated by the in situ growth of ultrathin Bi12O17Cl2 (BOC) nanosheets (NSs) onto porous g-C3N4 (PGCN) NSs. The NSs' nanostructure can effectively shorten the diffusion path of charge carriers and thus promote interfacial charge migration, which can improve the surface photocatalytic activity. The X-ray photoelectron spectroscopy spectra and the experimental measured Fermi level (E-F) indicate that electrons transfer from PGCN to BOC, which leads to the formation of the built-in electric field with the orientation from PGCN to BOC. Driven by the built-in electric field, the charge carriers transfer through a step-like pathway. This step-scheme porous g-C3N4/Bi12O17Cl2 (PGCN/BOC) heterostructured nanocomposite displays an enhanced photocatalytic performance compared with pure BOC and PGCN. This work provides new insight into the novel construction of a step-scheme heterojunction toward photocatalytic CO2 reduction. (C) 2020 Elsevier Inc. All rights reserved.
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