https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:15770 Wed 11 Apr 2018 16:07:16 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3211 Wed 11 Apr 2018 14:25:49 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29087 Thu 26 Jul 2018 14:45:18 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:10811 Sat 24 Mar 2018 08:13:23 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:12276 2000Fg⁻¹ which is at least a 250% increase in performance) when cycled over a 0.8V potential window in an aqueous electrolyte of 0.5 MNa₂SO₄. This excellent performance is discussed in terms of the manganese dioxide electrodeposition mechanism, in particular the growth mechanism under the preferred slow mass transport of electro-active species, and its effects on morphology. Furthermore, the origin of the enhanced capacitance is discussed, in which case we have proposed arises from contributions made by hydroxyl groups on the manganese dioxide nano-particulate surface, in addition to the fast redox reactions that are necessary for pseudo-capacitance.]]> Sat 24 Mar 2018 08:10:12 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:20945 Sat 24 Mar 2018 08:06:05 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:28282 Sat 24 Mar 2018 07:41:22 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24734 3+ intermediate is a key feature of this electrodeposition mechanism, the formation of which is dependent on the substrate, which in this case is either platinum, MnO₂ or MnOOH. On the platinum surface, for all electrolytes, soluble Mn³⁺ is produced initially. The stability of this soluble Mn³⁺ species determines the initial morphology, and rate of change of mechanism for the process. In a neutral electrolyte, nucleation and growth of MnO₂ occurs primarily through the precipitation of a 2D film of MnOOH on the platinum, which rapidly covers the surface. Nucleation in an acidic H₂SO₄ system occurs primarily via a disproportionation route which forms 3D MnO₂ hemispheroids that cover the substrate slowly. Subsequent growth of MnO₂ in both electrolytes then proceeds via formation of a MnOOH film, which is subsequently oxidized in the solid state to form MnO₂. MnOOH oxidation to MnO₂ appears kinetically limited, which is overall a limiting factor in the electrodeposition process.]]> Sat 24 Mar 2018 07:10:58 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32739 Mon 23 Sep 2019 13:38:24 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:22100 5 in two hydrophobic ionic liquids (1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl) trifluorophosphate ([Py_1,4]FAP) and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) amide ([Py_1,4]TFSA) is probed using three in situ techniques: scanning tunneling microscopy (STM), atomic force microscopy (AFM), and electrochemical quartz crystal microbalance (EQCM). These techniques reveal that under similar conditions TaF₅is more easily reduced in the liquids with [TFSA]⁻ than [FAP]⁻anions. Increasing the temperature reduced the viscosity and density of the ionic liquids which facilitates TaF₅ electroreduction, in particular, in [Py_1,4]TFSA. A herringbone reconstruction of the Au electrode was observed by STM for both ionic liquids with and without TaF₅. Ta deposition was proved by STM and EQCM in [Py_1,4]TFSA. Cracked layers, with ionic liquid trapped inside, were obtained by direct plating from the [TFSA]− ionic liquid. No Ta containing deposits could be obtained in the liquid with the [FAP]− anion.]]> Mon 23 Sep 2019 11:13:11 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24002 in situ techniques: scanning tunneling microscopy (STM), atomic force microscopy (AFM), and electrochemical quartz crystal microbalance (EQCM). These techniques reveal that under similar conditions TaF₅ is more easily reduced in the liquids with [TFSA]⁻ than [FAP]-anions. Increasing the temperature reduced the viscosity and density of the ionic liquids which facilitates TaF₅ electroreduction, in particular, in [Py₁,₄]TFSA. A herringbone reconstruction of the Au electrode was observed by STM for both ionic liquids with and without TaF₅. Ta deposition was proved by STM and EQCM in [Py₁,₄]TFSA. Cracked layers, with ionic liquid trapped inside, were obtained by direct plating from the [TFSA]⁻ ionic liquid. No Ta containing deposits could be obtained in the liquid with the [FAP]⁻ anion.]]> Mon 23 Sep 2019 10:21:47 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33883 2+.]]> Mon 21 Jan 2019 15:57:47 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33879 Mon 21 Jan 2019 15:50:49 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36848 2CO₃-Na₂CO₃-K₂CO₃ eutectic is used to produce highly amorphous carbon with considerable oxygen functionalization in a process focusing on the conversion of CO₂ to value-added carbon. Electrochemical characterization of materials using multiple techniques in different electrolytes allowed for the optimization of these materials as electrochemical capacitor electrodes. Variation in capacitive performance of the investigated materials has been provided based on their physical characteristics. The synthesized carbons are hybrid materials, showing both pseudocapacitive and electric double layer contributions to the total performance. Annealing under nitrogen at 800 °C is shown to widen pores in the carbon material, resulting in an increase in medium scan rate (5-10 mV.s^-1) capacitance. A stable specific capacitance of 425 F.g^-1 is obtained at 5 mV s^-1 in 0.5 M Na₂SO₄ after 1000 cycles.]]> Mon 13 Mar 2023 14:32:38 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33858 Fri 18 Jan 2019 15:58:46 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54173 Fri 09 Feb 2024 14:23:24 AEDT ]]>