https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42886 Tue 06 Sep 2022 11:58:22 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30924 Thu 30 Jan 2020 10:16:09 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37537 Chlorella vulgaris was systematically investigated at the temperatures of 600–900 °C and pressures of 0.1–4.0 MPa. It was found that pressure had a profound impact on the transformation of nitrogen during pyrolysis. The nitrogen retention in bio-char and its content in bio-oil reached a maximum value at 1.0 MPa. The highest conversion of nitrogen (50.25 wt%) into bio-oil was achieved at 1.0 MPa and 800 °C, which was about 7 wt% higher than that at atmospheric pressure. Higher pressures promoted the formation of pyrrolic-N (N-5) and quaternary-N (N-Q) compounds in bio-oil at the expense of nitrile-N and pyridinic-N (N-6) compounds. The X-Ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) results on bio-chars clearly evidenced the transformation of N-5 structures into N-6 and N-Q structures at elevated pressures. The nitrogen transformation pathways during pyrolysis of microalgae were proposed and discussed.]]> Thu 04 Feb 2021 16:34:37 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:31123 Sat 24 Mar 2018 08:44:41 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39802 vs RHE), a limiting current density of −5.24 mA cm⁻², and an electron transfer number of 3.87) in 0.1 M KOH solution, which are comparable to that of the benchmark Pt/C electrode, while the former presented better selectivity and short-term durability. The synergy of the formed multi-heterointerface/chemical phases of Ta-based compounds and high content of N-pyridinic, N-quaternary, and N-nitride (metal-N) nitrogen functionalities in carbon were experimentally revealed as the major feature contributing to the enhanced ORR activity. This work sheds light on a sustainable and effective strategy to design and synthesize cost-effective and high-performance carbon-based composite electrocatalysts from fruit waste biomass and unlocks the superb intrinsic catalytic activity of transition metal compounds.]]> Mon 29 Jan 2024 17:47:48 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47513 Mon 23 Jan 2023 12:15:27 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42309 c), interlayer spacing (d₀₀₂) and lateral size of the graphite structures (L_a) were used to evaluate the graphitic structures in chars. The results showed an increase in L_c,, L_a, and the average number of graphene sheets with pyrolysis pressure, indicating a more ordered carbon structure at elevated pressures. The d-spacing of char was in the range of 3.34-3.37 Å, similar to typical graphitic structures.]]> Mon 22 Aug 2022 09:14:19 AEST ]]>