Carbon quantum dot-modified TiO2/SrTiO3 heterojunction for boosting photocatalytic CO2 reduction

Qing-shan Wang, Yi-chao Yuan, Chu-fan Li, Zhen-rui Zhang, Cheng Xia, Wei-guo Pan, Lu Liu and Rui-tang Guo

Renewable Energy, 2024, vol. 231, issue C

Abstract: An efficient carbon quantum dot (CQD)-modified TiO2/SrTiO3 heterojunction was constructed for photocatalytic CO2 reduction in this paper. Photogenerated electrons of SrTiO3 transferred to TiO2 via the transfer channel of CQDs for electron-hole recombination, while the photogenerated electrons migrated from TiO2 to CQDs to participate in the photocatalytic CO2 reduction reaction. Meanwhile, the up-conversion of CQDs enhanced the light harvesting ability of the catalyst and the CQDs enriched the active reaction sites. Due to the above advantages, the CO and CH4 produce rate over 0.1-CTS reached 54.9 and 35.9 μmol g−1 h−1, respectively, which was dramatically increased compared with pure TiO2 and pure SrTiO3. This work proposes a feasible strategy for integrating CQDs with TiO2 and SrTiO3 for the optimistic cooperative effect to obtain an effective catalyst for photocatalytic CO2 reduction.

Keywords: Photocatalysis; CO2 reduction; Perovskite oxides; Heterojunction; CQDs (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:231:y:2024:i:c:s0960148124010656

DOI: 10.1016/j.renene.2024.120997

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