https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49628 Wed 24 May 2023 13:32:39 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51162 Wed 23 Aug 2023 17:25:12 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:38517 2O₃ (possessing weak acid sites, 9.2 nm) and Ru/SiO₂ (absence of acid sites, 15.2 nm) were also prepared and examined. It was observed that a decrease in the Si/Al ratio of the support results in an increase in the yield of cyclohexane and a decrease in the yield of 2-methoxycyclohexanol in HDO of guaiacol. This data also discloses the influence of the concentration of acid sites on the deoxygenation of 2-methoxycyclohexanol. Both Ru/BEA and Ru/ZSM-5, with both possessing low Si/Al ratios, display a high activity for HDO for guaiacol, while only the Ru/BEA catalyst exhibits a high activity for HDO of biocrude oil. Catalyst characterisation (BET, NH₃-TPD and NH₃ and acetonitrile-d3-FTIR) shows that the Ru/BEA catalyst, with a low Si/Al ratio, not only possesses strong Brønsted acid sites but also contains extensive mesoporosity. Notably, these mesopores appear to facilitate the hydrogenation, deoxygenation, and ring-opening of large oxygenated and condensed-ring hydrocarbons in biocrude oil which then leads to a high yield of cycloalkanes. As expected, the Ru/Al₂O₃ and Ru/SiO₂ catalysts exhibit a high hydrogenation activity but a lower deoxygenation activity in the HDO of guaiacol and biocrude oil. These results suggest that the larger pore support, with strong Brønsted acid sites, engendered the HDO activity observed. The reaction pathway for the main components of biocrude oil was proposed based on the observed reaction product distribution.]]> Wed 20 Oct 2021 11:28:59 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43207 Wed 14 Sep 2022 11:53:42 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36349 13C isotopic labeling. This work develops precursor microstructure engineering as a promising strategy for rational design of unordinary g-C₃N₄ structure for renewable energy production.]]> Tue 19 Sep 2023 15:05:56 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40121 2-TPD and H₂-FTIR. IDP catalyst displays a higher metal dispersion and higher concentration of nickel hydrides than impregnated and DP catalysts, while bigger Ni nanoparticles formed in impregnated catalysts exhibit a higher concentration of nickel hydrides per surface Ni. The guaiacol conversion was not significantly affected by the catalyst preparation method, while the product selectivity was altered. Higher cyclohexane formation rate was detected over IDP catalysts compared to DP and impregnated catalysts. Besides, cyclohexane formation rate displays a positive linear correlation with the concentration of nickel hydrides, suggesting nickel hydrides play a crucial role in the hydrodeoxygenation reaction.]]> Tue 05 Jul 2022 13:57:40 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55003 Thu 28 Mar 2024 10:15:18 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21066 Sat 24 Mar 2018 07:59:25 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3301 Sat 24 Mar 2018 07:22:24 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46850 2 photoreduction into solar fuels is promising for generating renewable energy. Herein, SrBi₂Nb₂O₉ nanosheets are prepared as high-performance photocatalysts for CO₂ reduction, highlighting superiority of ferroelectric polarization and anisotropic charge migration. Ferroelectric polarization within SrBi₂Nb₂O₉ nanosheets provides an in-built electric field, which greatly facilitates the bulk charge separation. Also, the photogenerated electrons and holes migrate separately to the NbO₆ octahedral layers and within the ab-plane in the Bi₂O₂ layers, achieving efficient anisotropic charge migration. Without co-catalyst or sacrificial agent, SrBi₂Nb₂O₉ nanosheets show outstanding CO₂ reduction activity in producing CH₄. The ferroelectric polarization is further enhanced by electric poling and annealing post-treatments. The electrically poled SrBi₂Nb₂O₉ shows a high CH₄ evolution rate of 25.91 μmol g⁻¹ h⁻¹ with an AQE of 1.96 % at 365 nm, exceeding most of state-of-the-art photocatalysts reported to date. This work paves an avenue for development of highly efficient photocatalysts and beyond by tuning the ferroelectricity and electronic structure.]]> Mon 29 Jan 2024 18:48:21 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48009 Mon 29 Jan 2024 18:45:16 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50871 Mon 29 Jan 2024 18:25:16 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46323 3N₄ (P-CN) for advanced photocatalytic applications. Phosphorus doping and structural coupling with CdSe QDs are shown to significantly extend visible-light response of g-C₃N₄ up to 700 nm. The optimized sample 4CdSe/P-CN demonstrates enhanced visible-light driven overall water splitting activities for H₂ and O₂ evolution i.e. 113 and 55.5 μmol.h⁻¹.g⁻¹, respectively, as well as very high photocatalytic CO₂ to CH₄ conversion efficiency (47 μmol.h⁻¹.g⁻¹). It also exhibit higher activity (78 %) for 2,4-dichlorophenol degradation as compared to pristine CN-sample. Combined photoluminescence, transient/single wavelength photocurrent, photoelectrochemical, and coumarin fluorescence spectroscopy demonstrate that 4CdSe/P-CN nanocomposite exhibit enhanced charge separation efficiency which is responsible for improved visible light catalytic activities. Our work thus provide a new strategy to design low-cost and sustainable photocatalysis with wide visible-light activity for practical overall water splitting and CO₂ reduction applications.]]> Mon 29 Jan 2024 17:44:21 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55052 Fri 05 Apr 2024 09:13:49 AEDT ]]>