Significantly enhanced photothermal catalytic CO2 reduction over TiO2/g-C3N4 composite with full spectrum solar light

Xiaoyan Bao; Dawei Lu; Zining Wang; Hao Yin; Biao Zhu; Bin Chen; Meixiang Shi; Yang Zhang; Qianxin Xu; Yumei Qin; Xing-Can Shen; Kai Wu

doi:10.1016/j.jcis.2023.01.096

Significantly enhanced photothermal catalytic CO₂ reduction over TiO₂/g-C₃N₄ composite with full spectrum solar light

J Colloid Interface Sci. 2023 May 15:638:63-75. doi: 10.1016/j.jcis.2023.01.096. Epub 2023 Jan 21.

Authors

Xiaoyan Bao¹, Dawei Lu¹, Zining Wang², Hao Yin¹, Biao Zhu¹, Bin Chen¹, Meixiang Shi¹, Yang Zhang¹, Qianxin Xu¹, Yumei Qin³, Xing-Can Shen⁴, Kai Wu⁵

Affiliations

¹ State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin 541004, China.
² BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
³ State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin 541004, China. Electronic address: qinyumei@gxnu.edu.cn.
⁴ State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin 541004, China. Electronic address: xcshen@gxnu.edu.cn.
⁵ BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. Electronic address: kaiwu@pku.edu.cn.

PMID: 36736119
DOI: 10.1016/j.jcis.2023.01.096

Abstract

Using solar energy to drive catalytic conversion of CO₂ into value-added chemicals has great potential to alleviate the global energy shortage and anthropogenic climate change. Herein, a "hitting three birds with one stone" strategy was reported to prepared boron-doped g-C₃N₄/TiO_2-_x composite (BCT) by a one-step thermal reduction process. A series of characterizations showed that the composite catalyst has extended full-spectrum absorption, rapid photogenerated charge separation, and outstanding CO₂ photoreduction performance (265.2 μmol g^-1h^-1), which is 7.5 and 9.2 times higher than that of pure TiO₂ and g-C₃N₄, respectively. In addition, the CO₂ conversion rate can be further increased to 345.1 μmol g^-1h^-1 at 70 °C due to its excellent photothermal conversion. Mechanistic studies reveal that synergistic effects alter the charge density distribution, thereby lowering the energy barrier for CO₂ conversion by adsorbing and activating CO₂ molecules_. This work provides a novel three-in-one integrated strategy for fabricating high-efficiency catalysts.

Keywords: CO(2) reduction; Full solar spectrum; Heterojunction; Photothermal catalysis.

MeSH terms

Carbon Dioxide*
Catalysis
Light
Solar Energy*

Substances

Carbon Dioxide
titanium dioxide