- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Fabrication of Fe-doped SrTiO3 photocatalyst with enhanced dinitrogen photofixation performance
摘要： SrTiO3 as semiconducting photocatalyst has been extensively investigated due to its band edges meeting the thermodynamic requirements for water splitting, but a few attention has been concentrated on its application in the NH3 synthesis via N2 photofixation process. Herein, Fe-doped SrTiO3 (FexSr1-xTiO3) products (0 ≤ x ≤ 0.20) were synthesized via a hydrothermal process followed by calcination at 700oC. All FexSr1-xTiO3 products (0.03 ≤ x ≤ 0.20) deliver an enhanced N2 fixation ability, and FexSr1-xTiO3 (x = 0.10) achieves the best NH3 production activity of 30.1 μmol g-1 h-1, which is 3.2-hold higher than that of SrTiO3 alone. Once the x value is higher than 0.10, FexSr1-xTiO3 will transform into composites containing Fe-doped SrTiO3 and α-Fe2O3, which acts as charge recombination sites, thus causes a decreased N2 fixation activity. Further investigations demonstrate that the surface Fe3+-doped sites can not only chemisorb and activate N2 molecules, but also promote the interfacial electron transfer from Fe-doped SrTiO3 to N2 molecules, and thus significantly improve the N2 fixation ability. The present Fe-doped SrTiO3 products exhibit characteristic features such as stable and efficient N2 fixation ability as well as simultaneous realization of N2 reduction and H2O oxidation without co-catalyst, which are of significance in artificial photosynthesis with H2O as electron and proton sources.
关键词： Photocatalysis,Fe-doped SrTiO3,Dinitrogen photofixation,N2 molecule activation
更新于2025-11-21 11:01:37
-
KOH-Modified Ni/LaTiO2N Schottky Junction Efficiently Reducing CO2 to CH4 under Visible Light Irradiation
摘要： Efficiency of solar-driven CO2 into fuels is largely limited by the sluggish reaction kinetics resulting from high activation barriers and poor electron-hole separation. Here, a synergistic strategy was proposed to overcome these obstacles. As a prototype, KOH-modified Ni/LaTiO2N photocatalyst afforded a high performance in CO2 reduction with a generation rate of 9.69 μmol g-1 for CH4 and 0.31 μmol g-1 for CO, about 5 times higher than the catalytic activities of LaTiO2N. The prominent enhancement results in the following effects: (1) Schottky barrier at Ni/LaTiO2N interface boosts separation of electron-hole pairs. (2) The OH- of KOH as basic sites favors activation of CO2 into CO3 2- species, significantly improving the reaction kinetics of CO2 reduction. (3) The OH- also functions as hole acceptor, boosting the proton release from H2O oxidation.
关键词： molecule activation,Schottky junction,CO2 reduction,charge separation
更新于2025-09-09 09:28:46