https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27376 Wed 11 Apr 2018 12:37:45 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21617 Wed 11 Apr 2018 11:07:56 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39450 Wed 08 Jun 2022 09:41:19 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40006 4, 0.1 M Na₂SO₄ and manganese citrate concentrations of 0, 0.5, 2 or 4 mM. It was found that varying the citrate concentration changed the deposition mechanism by stabilising the Mn³⁺ intermediate formed by the oxidation of Mn²⁺. The different stability of the Mn³⁺ ion affects the rate of nucleation on the surface and subsequent growth of the film. This in turn, affects the morphology of the deposited material. Understanding the effects of the deposition mechanism on the resultant film morphology is necessary to optimise the properties of electrodeposited films for their various applications.]]> Tue 21 Mar 2023 18:27:28 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36942 -1/2), as well as the residual capacitance and the inverse of the scan rate (v^-1).]]> Tue 21 Jul 2020 11:33:42 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36941 2SO₄ between 0.0-0.8 V (vs SCE). It was found that in all cases, the specific capacitance was decreased by increasing the sweep rate. The capacitance-sweep rate dependence was only found to be accurate in a short range of low sweep rates. Overall there was good agreement between the SPECS and current-sweep rate dependence models over the full range of sweep rates. However, the SPECS method provided more precise information about the kinetic behavior of the electrochemical cell through a full range of sweep rates.]]> Tue 21 Jul 2020 11:26:42 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36940 1v + k₂v^1/2, where k₁ and k₂ are constants. Outcomes from the analysis indicate that this approach is complicated by the resistance associated with double layer formation, electrode instabilities in the electrolyte under study, and also increased electrode resistance.]]> Tue 21 Jul 2020 11:19:42 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36939 Tue 21 Jul 2020 11:19:41 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36938 + (0.01 M AgNO₃ in ACN) reference electrode. Situated between the opposing AC electrodes, between two separators, is a Pt sensing electrode, the potential of which is either monitored or controlled to explore either electrolyte fluxes during cycling, or the formation of soluble species in the electrolyte, respectively. It was deduced that electrolyte ions are strongly associated with the AC electrodes rather than between the electrodes even without an applied potential. Furthermore, aging of the electrochemical system with cycling (cyclic voltammetry) is also explored. Even with identical electrodes it is noted that the individual electrodes behaved differently as a result of anion versus cation association. Finally, at cell voltages approaching 2 V, oxidation of the positive electrode is observed, liberating species into the electrolyte. The implications of these observations have been discussed.]]> Tue 21 Jul 2020 11:05:42 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36937 Tue 21 Jul 2020 10:51:42 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39605 Thu 16 Jun 2022 09:54:02 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43377 Thu 15 Sep 2022 16:14:33 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54296 Thu 15 Feb 2024 14:52:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46822 + reference electrode, individual electrode potentials were measured showing that even though it is a symmetrical device, polarization on the positive electrode was always greater than the negative electrode, implying that the negative electrode capacitance is greater. Deconvolution of the i-t transients from the SPECS experiment across the device voltage window can be accomplished in a similar fashion to the study of a single electrode, in which case geometric and porous capacitances, as well as diffusion and residual processes are identified. Similarly, the components of the i-t transients can be converted into voltametric data, providing access to individual electrode performance over a wide range of sweep rates in the device. The inclusion of a sensing electrode between he positive and negative electrodes is also described, providing insight into electrolyte fluxes and electrode stability within the device.]]> Thu 01 Dec 2022 10:00:23 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47594 Mon 23 Jan 2023 14:56:26 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36935 Mon 20 Jul 2020 13:56:55 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48830 Mon 10 Apr 2023 10:35:30 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:37206 2SO₄ electrolyte carbon hollow spheres provide much better overall capacitance values as compared to high surface area activated carbon due to the better surface area utilization particularly at large scan rates. Carbon hollow spheres exhibited 74% more specific surface area utilization for energy storage as an electrode material in comparison to activated carbon in 0.5 M Na₂SO₄ solution. When, overall capacitance is divided in to the fragment capacitances in terms of geometric, porous and diffusional contents; morphology of hollow spheres played an important role while in the non-aqueous solutions specific capacitance values remained dependent on the specific surface area of the carbon material. Diffusional fragment of capacitance values in carbon hollow spheres remained limited because of limited thickness of the hollow shells. In this study, at 1 mV s⁻¹ carbon hollow spheres with 29 nm shell thickness and with a specific surface area of 1523 m² g⁻¹ exhibited a specific capacitance values of 105 F g⁻¹ and 127 F g⁻¹ as compared to 85 and 121 F g⁻¹ for activated carbon with a specific surface area of 1895 m² g⁻¹ in 0.5 M sodium sulfate and 1.0 M TEABF₄ respectively.]]> Mon 03 Apr 2023 11:52:29 AEST ]]>