https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40922 2) are expected to offer superior basicity and unique electronic properties. However, the synthesis of these nanostructures is highly challenging since many parts of the C-N frameworks in the carbon nitride should be replaced with thermodynamically less stable N-N frameworks as the nitrogen content increases. Thermodynamically stable C₃N₇ and C₃N₆ with an ordered mesoporous structure are synthesized at 250 and 300 °C respectively via a pyrolysis process of 5-amino-1H-tetrazole (5-ATTZ). Polymerization of the precursor to the ordered mesoporous C₃N₇ and C₃N₆ is clearly proved by X-ray and electron diffraction analyses. A combined analysis including diverse spectroscopy and FDMNES and density functional theory (DFT) calculations demonstrates that the N-N bonds are stabilized in the form of tetrazine and/or triazole moieties in the C₃N₇ and C₃N₆. The ordered mesoporous C₃N₇ represents the better oxygen reduction reaction (ORR) performances (onset potential: 0.81 V vs reversible hydrogen electrode (RHE), electron transfer number: 3.9 at 0.5 V vs RHE) than graphitic carbon nitride (g-C₃N₄) and the ordered mesoporous C₃N₆. The study on the mechanism of ORR suggests that nitrogen atoms in the tetrazine moiety of the ordered mesoporous C₃N₇ act as active sites for its improved ORR activity.]]> Tue 16 Aug 2022 10:28:43 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44155 C3N5 > g-C3N4. Bader charge analysis shows that the charge transferred from lithium and sodium ions is more distributed across the hybrid material as compared to the pure C3N5. It is experimentally found that the optimized mesoporous C3N5/MoS2 hybrid shows a 3.86 and 10.80 times increase in reversible capacities as compared to mesoporous g-C3N4 for lithium and sodium ion batteries, respectively. Based on the comparative mechanism studies, the limited intercalation kinetics and surface-derived ion storage hinder the application of the mesoporous g-C3N4 in lithium and sodium ion batteries, respectively. The synthesized mesoporous C3N5/MoS2 hybrids with mesopore channels, expanded gallery height and desired ion adsorption energies provide insights to improve the electrode performances of carbon nitrides-based materials for lithium and sodium ion batteries.]]> Mon 29 Jan 2024 17:43:09 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36506 Mon 25 May 2020 12:08:47 AEST ]]>