TY - JOUR
T1 - In-situ self-sacrificed fabrication of insulator-based SrTiO3/SrCO3 heterojunction interface for gaseous HCHO and NO photocatalytic degradation
AU - Han, Shuwen
AU - Li, Xinwei
AU - Tan, Yan
AU - Huang, Yu
AU - Wu, Zhongbiao
AU - Wang, Meng
AU - Ho, Wingkei
AU - Lee, Shuncheng
N1 - Funding Information:
This work was supported by The Environment and Conservation Fund of Hong Kong Government (Project No. ECF 63/2019), The Research Grants Council of Hong Kong Government (Project No. T24/504/17 and T31-603/21-N).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/3/1
Y1 - 2023/3/1
N2 - In this work, novel heterostructured SrTiO
3/SrCO
3 (STO/SCO) interface was constructed via the one-pot g-C
3N
4(CN) self-sacrificing hydrothermal strategy. The as-developed STO/SCO photocatalyst shows the air cleaning potential in continuous-flow reactors with degradation rates of NO and HCHO at 44 % and 40 %, respectively. From XRD, FTIR, and XPS analysis, CN participates in the crystallise process as the source of CO
3
2− to form the STO/SCO interface viewed by TEM and HRTEM. Subsequent temperature-programmed desorption (TPD) analysis and density functional theory (DFT) calculation results revealed the enhanced chemisorption effects of O
2 on the catalyst surface. The existence of oxygen vacancies combined with the formation of heterojunction surface induces intermediate levels, which leads to the photocatalytic oxidation under simulated solar light. Charge difference distribution simulation coupled with electrochemistry and photoluminescence tests confirmed the internal-built electron fields at the heterojunction interface which would be beneficial for photocarriers separation. Based on the above-mentioned effects, enhanced reactive oxygen species (ROS)
[rad]OH and
[rad]O
2
− were detected under light irradiation by electron spin resonance (ESR). This work demonstrates the effectiveness of in-situ self-sacrificed strategy for construction of heterojunction interfaces and provides opportunities by utilising insulator-based materials for photocatalytic degradation of air pollutants.
AB - In this work, novel heterostructured SrTiO
3/SrCO
3 (STO/SCO) interface was constructed via the one-pot g-C
3N
4(CN) self-sacrificing hydrothermal strategy. The as-developed STO/SCO photocatalyst shows the air cleaning potential in continuous-flow reactors with degradation rates of NO and HCHO at 44 % and 40 %, respectively. From XRD, FTIR, and XPS analysis, CN participates in the crystallise process as the source of CO
3
2− to form the STO/SCO interface viewed by TEM and HRTEM. Subsequent temperature-programmed desorption (TPD) analysis and density functional theory (DFT) calculation results revealed the enhanced chemisorption effects of O
2 on the catalyst surface. The existence of oxygen vacancies combined with the formation of heterojunction surface induces intermediate levels, which leads to the photocatalytic oxidation under simulated solar light. Charge difference distribution simulation coupled with electrochemistry and photoluminescence tests confirmed the internal-built electron fields at the heterojunction interface which would be beneficial for photocarriers separation. Based on the above-mentioned effects, enhanced reactive oxygen species (ROS)
[rad]OH and
[rad]O
2
− were detected under light irradiation by electron spin resonance (ESR). This work demonstrates the effectiveness of in-situ self-sacrificed strategy for construction of heterojunction interfaces and provides opportunities by utilising insulator-based materials for photocatalytic degradation of air pollutants.
KW - Insulator-based photocatalyst
KW - NOx and HCHO removal
KW - Oxygen activation
KW - SrTiO /SrCO heterojunction interface
UR - https://www.scopus.com/pages/publications/85142746526
U2 - 10.1016/j.apsusc.2022.155806
DO - 10.1016/j.apsusc.2022.155806
M3 - Journal article
SN - 0169-4332
VL - 612
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 155806
ER -