Enhanced photocatalytic performance of ordered mesoporous Fe-doped CeO2 catalysts for the reduction of CO2 with H2O under simulated solar irradiation

In situ synthesis of ordered mesoporous Co-doped TiO2 and its enhanced photocatalytic activity and selectivity for the reduction of CO2

“…[38][39][40][41][42] Besides, photocatalysts with ordered mesoporous structures have attracted growing interest due to their uniformly distributed porosity, ordered channels and high specific surface area. [43][44][45] The highly ordered mesoporous structure develops a high-efficient CO 2 adsorption ability and improves the separation and transport of electron-hole. In addition, the active sites exist not only on the outside surface of mesoporous catalyst, but also exist on the inner surface of pores.…”

Effect of Fe Loading Condition and Reductants on CO2 Reduction Performance with Fe/TiO2 Photocatalyst

“…Consequently, the Fe/TiO 2 (100) which has enough area absorbing light and contacting reactants has the best CO 2 reduction performance. On the other hand, the molar quantity of CO per weight of photocatalyst for Fe/TiO 2 (500) is the highest among the prepared photocatalysts under NH 3 From Figures 12-14, it can be seen that the CO 2 reduction performance of TiO 2 is promoted by Fe doping due to extension of the photoresponsivity of TiO 2 [41] to the visible spectrum as well as decrease in the recombination rate of electron-hole pairs by the generation of shallow charge traps in the crystal structure. According to Figures 12-14, the molar quantity of CO per weight of photocatalyst for Fe/ TiO 2 (500) is the highest among the prepared photocatalysts, which indicates that the larger pulse number is suitable for the illumination condition without UV light.…”

“…According to Figures 12-14, the molar quantity of CO per weight of photocatalyst for Fe/ TiO 2 (500) is the highest among the prepared photocatalysts, which indicates that the larger pulse number is suitable for the illumination condition without UV light. Under the illumination condition without UV light, the amount of doped Fe is important to absorb the visible light in order to perform the photocatalytic reaction [41]. As to the Fe/TiO 2 (1000), since the too-high loading Fe covered the TiO 2 surface, the light absorption ability was impaired and the contact between TiO 2 and CO 2 + reductant was blocked [40], resulting in lower CO 2 reduction performance compared to the other pulse numbers.…”

Highly active CeO2 hollow-shell spheres with Al doping

“…S6. All samples gave rise to ten peaks, but it is noteworthy that the concentration of Ce 3+ increased with the doping of Al [30]. When the starting Ce:Al ratio reached 50:1, the Ce 3+ concentration increased significantly, moving from 17.1% to 31.2% (Table 1).…”

“…The major peak of component OI with a binding energy (BE) of 529.3-529.6 eV is characteristic of lattice oxygen. Component OII with BE≈531.4-531.7 eV is attributed to active oxygen species [21] (most likely oxygen vacancies [30,31] and adsorbed oxygen molecules [32,33]). Obviously, with a decrease in the Ce:Al ratio, the relative intensity of the OII to OI peaks became stronger, which means the active species increased from 26.78% to 70.22%.…”