Efficient interfacial charge transfer of 2D/2D porous carbon nitride/bismuth oxychloride step-scheme heterojunction for boosted solar-driven CO2 reduction

Yao Huo; Jinfeng Zhang; Zhongliao Wang; Kai Dai; Chengsi Pan; Changhao Liang

doi:10.1016/j.jcis.2020.10.048

Efficient interfacial charge transfer of 2D/2D porous carbon nitride/bismuth oxychloride step-scheme heterojunction for boosted solar-driven CO₂ reduction

J Colloid Interface Sci. 2021 Mar:585:684-693. doi: 10.1016/j.jcis.2020.10.048. Epub 2020 Oct 20.

Authors

Yao Huo¹, Jinfeng Zhang², Zhongliao Wang², Kai Dai³, Chengsi Pan⁴, Changhao Liang⁵

Affiliations

¹ Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, School of Physics and Electronic Information, Huaibei Normal University, Huaibei, Anhui 235000, PR China; Department of Materials Science, Fudan University, Shanghai 200433, PR China.
² Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, School of Physics and Electronic Information, Huaibei Normal University, Huaibei, Anhui 235000, PR China.
³ Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, School of Physics and Electronic Information, Huaibei Normal University, Huaibei, Anhui 235000, PR China. Electronic address: [email protected].
⁴ School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China. Electronic address: [email protected].
⁵ Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China. Electronic address: [email protected].

PMID: 33121755
DOI: 10.1016/j.jcis.2020.10.048

Abstract

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.

Keywords: Bi(12)O(17)Cl(2); Build-in electric field; Photocatalytic CO(2) reduction; Step-scheme heterojunction; g-C(3)N(4).