异质结
X射线光电子能谱
光催化
材料科学
光致发光
高分辨率透射电子显微镜
化学工程
解吸
氧气
光化学
催化作用
纳米技术
光电子学
吸附
化学
物理化学
透射电子显微镜
有机化学
工程类
生物化学
作者
Shuwen Han,Xinwei Li,Yan Tan,Yu Huang,Zhongbiao Wu,Meng Wang,Wingkei Ho,Shuncheng Lee
标识
DOI:10.1016/j.apsusc.2022.155806
摘要
In this work, novel heterostructured SrTiO3/SrCO3 (STO/SCO) interface was constructed via the one-pot g-C3N4(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 CO32− 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 O2 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) OH and O2− 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.
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