https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47719 Wed 25 Jan 2023 13:22:33 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49628 Wed 24 May 2023 13:32:39 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52597 Wed 18 Oct 2023 08:50:15 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39596 Wed 15 Jun 2022 12:47:16 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51674 Wed 13 Sep 2023 13:23:44 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36598 Wed 10 Jun 2020 15:12:43 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36832 Ia3d symmetry and controllable surface properties through a simple polymerization of an environmentally benign and non-toxic guanidine hydrochloride as a C and N precursor using KIT-6 with variable pore sizes as templates for Suzuki coupling reaction. The pore diameters (3.1-4.2 nm), specific surface areas (207-303 m² g^-1), and the specific pore volumes (0.58-0.71 cm³ g^-1) of the MGCN-6 materials are finely controlled by varying the pore size of the templates used. The nano cavities of MGCN-6 with the highest specific surface area and a free amine groups are effectively utilized to chelate with Pd(OAC)₂ and applied the prepared catalysts for Suzuki coupling reaction between aryl halides with phenylboronic acid derivatives under very mild and sustainable reaction conditions. The Pd(OAC)₂/MGCN-6 is found to be very active and stable and exhibits an excellent reactivity and selectivity for all of substrates regardless of aryl halides with electron-withdrawing and electron donating groups at room temperature. The activity of the Pd(OAC)₂/MGCN-6 is much higher than that of non-porous bulk graphitic carbon nitride and 2D mesoporous carbon nitride.]]> Wed 08 Jul 2020 15:26:45 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52887 Tue 31 Oct 2023 10:46:23 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:53459 Tue 28 Nov 2023 11:13:57 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:46357 Tue 15 Nov 2022 14:33:56 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47076 Tue 13 Dec 2022 16:21:23 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51644 Tue 12 Sep 2023 20:14:39 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54127 Tue 06 Feb 2024 11:28:51 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36793 2 g⁻¹) and an appreciable amount of heteroatoms, nitrogen (4.4%) and oxygen (4.7%). PHC4 exhibits a high CO₂ adsorption capacity at 0 °C/1 bar (3.5 mmol g⁻¹) and 0 °C/30 bar (15.8 mmol  g⁻¹). Additionally, the presence of heteroatoms on the surface results in enhancement of interactions between CO₂ and the adsorbents which are evident from a high value of isosteric heat of adsorption (∼35 kJ mol⁻¹) calculated using Clausius Clapeyron's equation. The reported activation synthesis strategy could be explored further to devise advanced functional nanomaterials for specific adsorption applications.]]> Thu 22 Jun 2023 10:25:37 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38169 2O/(Si + Al), and their detailed porous structures were confirmed by TEM, N2 adsorption-desorption and X-ray diffraction measurements. The as-prepared geopolymers were then used as templates to replicate porous carbons with various structures and porosities for CO₂ adsorption. To understand the correlation between the CO₂ adsorptivity and porous structures, we tuned the porosity of the geopolymer-templated carbons by modifying the structures of the geopolymers. The porous carbons obtained from the hexagonal-type porous geopolymers were found to be composed of the aggregates of carbon nanowires exhibiting large particles, while those obtained from the wormhole-like porous geopolymers were determined to be wormhole type as well, as evidenced by TEM and X-ray diffraction studies. According to the CO₂ adsorption isotherms of the porous carbons, the aggregates of carbon nanowires exhibited the highest CO₂ adsorptivity due to their highest microporosity and largest specific surface area.]]> Thu 05 Aug 2021 15:57:46 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48220 Sat 11 Mar 2023 12:36:58 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:50892 Mon 29 Jan 2024 18:24:55 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:47582 Mon 23 Jan 2023 14:21:37 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49526 Mon 22 May 2023 08:31:22 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50510 Mon 07 Aug 2023 13:39:52 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47894 Mon 06 Feb 2023 13:32:00 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:45447 Fri 28 Oct 2022 14:08:10 AEDT ]]> 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: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 ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:53207 Fri 17 Nov 2023 11:48:02 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:53216 Fri 17 Nov 2023 11:40:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35922 1–x(ZnO)_x] is one of the promising visible light harvesting photocatalysts for overall water splitting. A series of (GaN)_1–x(ZnO)_x (0.11 ≤ x ≤ 0.33) compounds are synthesized by calcining the carbonate-type Zn/Ga-LDH precursor with and without sodium carbonate flux at 850 °C for 8–14 h under a NH₃ gas flow. The solid solutions without flux are determined to be low in crystallinity, but platelike morphology with preferred orientation could be observed. On the other hand, those with flux turn out to be better in crystallinity, and eventually exhibit significantly higher photocatalytic activity for overall water splitting under visible light irradiation than those without flux. In addition, the band gap energies can also be engineered from 2.57 to 2.72 eV by changing a synthetic parameter such as nitridation time. It is, therefore, suggested that the present new approach can offer new opportunities for designing the next generation of photocatalytic systems.]]> Fri 17 Jan 2020 09:43:08 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54657 Fri 08 Mar 2024 10:49:18 AEDT ]]>