High efficient all-day nitrogen fixation from air promoted by natural light and sea urchin-like Cobalt oxide photocatalyst under room temperature and atmosphere pressure

Catalytic Ozonation of Air toward Direct Nitric Acid Production Using Hierarchical Co3O4 with a Tunable Microstructure

“…It can be found that the N 2 molecule was bound to the octahedral Co atom with an exothermic energy of −0.317 eV in the Co 3 O 4 –OVs, while an endothermic energy (Δ G N 2 ) of 0.557 eV was needed in the chemical adsorption over the bulk Co 3 O 4 , indicating that the Co 3 O 4 –OV catalyst was spontaneous for chemisorbing N 2 molecules and intrinsically possesses a better potential to activate N 2 molecules. This result was consistent with the reports that the oxygen vacancies promoted N 2 molecule adsorption chemically as well as strengthened the polarization of the NN bond. ,, The first oxidation step of N 2 * to N 2 OH* was identified as the rate-determining step for both bulk Co 3 O 4 and Co 3 O 4 –OVs whether by • OH or • O 2 – radical oxidation pathway, of which the energy barrier was uphill by 5.169 and 4.169 eV in bulk Co 3 O 4 in the free energy profile, respectively. Meanwhile, the energy barrier for Co 3 O 4 –OVs by the • OH and • O 2 – radical pathways were decreased to 3.858 and 3.358 eV, respectively, much lower than that of bulk Co 3 O 4 , suggesting that the introduction of oxygen vacancies into Co 3 O 4 (Co 3 O 4 –OVs) could indeed greatly reduce the activation energy barrier of N 2 molecules.…”

N-doped Ti3C2-reinforced porous g-C3N4 for photocatalytic contaminants degradation and nitrogen reduction

“…Nowadays, environment and energy issues have attracted widespread attention. 1–3 Photocatalysis, which combines semiconductors with solar energy, has been extensively studied in the fields of environment and energy, involving the degradation of contaminants, 4,5 hydrogen (H 2 ) production, 6,7 carbon dioxide (CO 2 ) reduction, 8,9 nitrogen (N 2 ) fixation, 10,11 etc . Recently, there has been growing interest in the research of graphitic carbon nitride (g-C 3 N 4 ) because of its favorable energy band position, simple synthesis process, low cost, and superior chemical stability.…”

The order of loading affects photocatalytic nitrogen fixation activity of the ternary composites of PdO/Au–TiO2

“…10,11 Photocatalytic nitrogen fixation is not only environmentally friendly but also safe and easy to operate, and it has attracted widespread attention among scientists in recent years. 12–15…”

“…10,11 Photocatalytic nitrogen fixation is not only environmentally friendly but also safe and easy to operate, and it has attracted widespread attention among scientists in recent years. [12][13][14][15] Various semiconductors are used as photocatalysts to synthesize ammonia, including TiO 2 , Bi 2 WO 6 , g-C 3 N 4 , Bi 5 O 7 Br and so on. [16][17][18][19][20][21] Due to its chemically inert, low-cost, non-toxic and photostable characteristics, TiO 2 is widely studied and used as the catalyst in photocatalysis.…”