https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:55941 Wed 10 Jul 2024 15:57:23 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48541 Tue 21 Mar 2023 15:16:52 AEDT ]]> https://ogma.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://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46886 –1) compared to the nonporous S-CN (167.9 mA h g^–1) and g-C₃N₄ (5.4 mA h g^–1), highlighting the pivotal roles of the highly ordered mesoporous structure and S-doping in enhancing the electrochemical functionality of carbon nitride as an anode material for SIBs.]]> Tue 06 Dec 2022 09:52:16 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39783 Thu 30 Mar 2023 18:05:17 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41048 Thu 21 Jul 2022 14:49:30 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:31004 Arundo donax, with zinc chloride. The textural parameters of the AMB can easily be controlled by varying the activation temperature. It is demonstrated that the mesoporosity of AMB can be finely tuned with a simple adjustment of the amount of activating agent. AMB with almost 100% mesoporosity can be achieved using the activating agent and the biomass ratio of 5 and carbonization at 500 °C. Under the optimized conditions, AMB with a BET surface area of 3298 m² g^–1 and a pore volume of 1.9 cm³ g^–1 can be prepared. While being used as an adsorbent for CO₂ capture, AMB registers an impressively high pressure CO₂ adsorption capacity of 30.2 mmol g^–1 at 30 bar which is much higher than that of activated carbon (AC), multiwalled carbon nanotubes (MWCNTs), highly ordered mesoporous carbons, and mesoporous carbon nitrides. AMB also shows high stability with excellent regeneration properties under vacuum and temperatures of up to 250 °C. These impressive textural parameters and high CO₂ adsorption capacity of AMB clearly reveal its potential as a promising adsorbent for high-pressure CO₂ capture and storage application. Also, the simple one-step synthesis strategy outlined in this work would provide a pathway to generate a series of novel mesoporous activated biocarbons from different biomasses.]]> Sat 24 Mar 2018 07:34:50 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44363 Mon 29 Jan 2024 18:53:13 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48452 Mon 29 Jan 2024 18:51:18 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48406 Mon 29 Jan 2024 18:44:42 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51795 Mon 29 Jan 2024 18:40:53 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39863 2/g). UV–Vis and PL spectra show that the absorption edges of mesoporous gCNs are slightly blue-shifted and the PL intensity is remarkably suppressed. The photocatalytic hydrogen evolution activity of gCN-KIT-6 under solar simulated irradiation is 1.92 mmol·g⁻¹ h⁻¹ which is much higher than that of gCN with 2D mesoporous structure, gCN from silica nanoparticle and bulk nonporous gCN. This high photocatalytic activity of gCN-KIT-6 can be attributed to 3D structure and the retarded electron-hole recombination.]]> Mon 29 Jan 2024 17:49:59 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47222 Mon 29 Jan 2024 17:49:09 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46564 Mon 29 Jan 2024 17:44:08 AEDT ]]> https://ogma.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://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36506 Mon 25 May 2020 12:08:47 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47582 Mon 23 Jan 2023 14:21:37 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:42818 Mon 05 Sep 2022 11:14:22 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47769 Fri 27 Jan 2023 14:08:55 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41089 Fri 22 Jul 2022 17:18:26 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40428 2 capture. The materials are synthesized using KOH activation at 800 °C and show a high content of micropores and high specific surface areas which can be easily manipulated by varying the amount of KOH. The optimized material PAB3 obtained using KOH/grape marc biochar ratio of 3 displays the highest specific surface area (2473 m² g⁻¹), high micropore volume (0.72 cm³ g⁻¹) and a pore diameter of 0.74 nm. Owing to its highly developed porosity and excellent textural parameters, PAB3 exhibits a high CO₂ adsorption of 6.2 mmol g⁻¹ at 0 °C/1 bar and 26.8 mmol g⁻¹ at 0 °C/30 bar. It is often considered challenging to synthesize a CO₂ adsorbent with all-round performance for CO₂ capture under diverse conditions of temperature and pressure. The optimized material PAB3 is also found to be thermally stable which when coupled with its superior CO₂ capture performance presents a promising candidature in the field of carbon capture. Furthermore, the excellent features of the synthesized material suggest that these materials could be extended to several other adsorption related fields.]]> Fri 22 Jul 2022 14:30:25 AEST ]]>