Fabrication of 2H/3C-SiC heterophase junction nanocages for enhancing photocatalytic CO2 reduction

Yongzhi Liu; Bing Wang; Dongmiao Li; Jinni Shen; Zizhong Zhang; Xuxu Wang

doi:10.1016/j.jcis.2022.04.111

Fabrication of 2H/3C-SiC heterophase junction nanocages for enhancing photocatalytic CO₂ reduction

J Colloid Interface Sci. 2022 Sep 15:622:31-39. doi: 10.1016/j.jcis.2022.04.111. Epub 2022 Apr 25.

Authors

Yongzhi Liu¹, Bing Wang¹, Dongmiao Li¹, Jinni Shen², Zizhong Zhang³, Xuxu Wang¹

Affiliations

¹ State Key Lab of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, PR China.
² State Key Lab of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, PR China. Electronic address: t15067@fzu.edu.cn.
³ State Key Lab of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, PR China; Qingyuan Innovation Laboratory, Quanzhou 362801, China. Electronic address: z.zhang@fzu.edu.cn.

PMID: 35487109
DOI: 10.1016/j.jcis.2022.04.111

Abstract

The morphology and structure of photocatalyst play an important role in photocatalytic activity. SiC semiconductor is considered as a promising material for the photocatalytic CO₂ reduction due to its negative conduction band position. Herein, SiC nanocages is creatively synthesized by simple low-temperature molten-salt-mediated magnesiothermic reduction method with using SiO₂ as template. The morphology and phase composition of SiC nanocages can be controlled by magnesium dosage and reaction temperature. The 2H and 3C crystal phase in SiC nanocage can form heterophase junctions uniformly to effectively accelerate the photogenerated electron transfer, and plays a key role in improving the photocatalytic activity of 2H/3C-SiC samples. The optimal SiC nanocage sample possesses a CO generation rate of 4.68 μmol g^-1h^-1 for photocatalytic CO₂ reduction, which is 3.25 times higher than that of commercial SiC.

Keywords: CO(2) reduction; Heterophase junction; Magnesiothermic reduction; Nanocage; Photocatalytic; SiC.