Institutions

About Us

Help

Gaeilge
0
1000
Home
Browse
Advanced Search
Search History
Marked List
Statistics
A
A
A
Author(s)
Institution
Publication types
Funder
Year
Limited By:
Author = Lenihan, Catherine;
6 items found
Sort by
Title
Author
Item type
Date
Institution
Peer review status
Language
Order
Ascending
Descending
25
50
100
per page
Bibtex
CSV
EndNote
RefWorks
RIS
XML
Displaying Results 1  6 of 6 on page 1 of 1
Marked
Mark
A molecular dynamics exploration of the properties of bulk and nanosized singlecrystal copper
(2011)
Lenihan, Catherine
A molecular dynamics exploration of the properties of bulk and nanosized singlecrystal copper
(2011)
Lenihan, Catherine
Abstract:
Copper has a history of use that is at least 10,000 years old and it is still one of the most useful metals in today’s world. Nanocrystals of copper are of great scientific interest as they are effectively a bridge between bulk materials and atomic structures. Nanocrystalline copper is used in medical, electronic and coating applications. As Integrated Circuit devices approach nanoscale dimensions copper is the metal of choice for interconnect design. While bulk copper will have constant physical properties regardless of its size, at the nanoscale sizedependent properties are often observed. One purpose of this study was to investigate the properties of reduceddimension copper crystals and to compare the properties of these small crystals with those of bulk single crystal copper. Metal crystals contain inclusions such as vacancies and voids. These inclusions can change the properties of the crystal. Clusters of vacancies are also thought to result in void formation under certain c...
http://hdl.handle.net/10344/5843
Marked
Mark
Communicationobservation of arrhenius behavior of catholyte stability in vanadium flow batteries
(2016)
Oboroceanu, Daniela; Quill, Nathan; Lenihan, Catherine; Ní Eidhin, Deirdre; Albu, Sergi...
Communicationobservation of arrhenius behavior of catholyte stability in vanadium flow batteries
(2016)
Oboroceanu, Daniela; Quill, Nathan; Lenihan, Catherine; Ní Eidhin, Deirdre; Albu, Sergiu P.; Lynch, Robert P.; Buckley, Noel
Abstract:
The stability of typical vanadium flowbattery (VFB) catholytes with respect to precipitation of V2O5 was investigated at temperatures in the range 30–60◦C. In all cases a precipitate formed after an induction time, which decreased with increasing temperature and concentration of VV and increased with concentration of sulfate. Arrheniustype plots are shown for two typical solutions. These have excellent linearity and have similar slopes which yield an apparent activation energy of 1.79 eV (172 kJ mol−1). The variation of induction time with temperature for various concentrations of VV was simulated, and stability diagrams for additivefree VFB catholytes were generated.
PUBLISHED
peerreviewed
http://hdl.handle.net/10344/6274
Marked
Mark
Communication—A new additive for increased stabilization of catholytes in vanadium flow batteries (VFBs)
(2019)
Oboroceanu, Daniela; Quill, Nathan; Lenihan, Catherine; Lynch, Robert P.; Buckley, Noel
Communication—A new additive for increased stabilization of catholytes in vanadium flow batteries (VFBs)
(2019)
Oboroceanu, Daniela; Quill, Nathan; Lenihan, Catherine; Lynch, Robert P.; Buckley, Noel
Abstract:
We report a newadditive,monobasic potassium arsenate (KH2AsO4), for improving the thermal stability of VFB catholytes.Using our standard accelerated testing methodology at 30–70°C, we showed that the effect increases continuously with increasing concentration of arsenate over the range investigated (0 – 0.10 mol dm−3). In comparison to similar experiments with phosphate (H3PO4), the magnitude of the effect was greater for arsenate. A combination of arsenate and phosphate was also effective. Based on these results, we speculate that other GroupV elements in the +5 oxidation state may also stabilize VFB catholytes
http://hdl.handle.net/10344/7919
Marked
Mark
Effects of temperature and composition on catholyte stability in vanadium flow batteries: measurement and modeling
(2017)
Oboroceanu, Daniela; Quill, Nathan; Lenihan, Catherine; Ní Eidhin, Deirdre; Albu, Sergi...
Effects of temperature and composition on catholyte stability in vanadium flow batteries: measurement and modeling
(2017)
Oboroceanu, Daniela; Quill, Nathan; Lenihan, Catherine; Ní Eidhin, Deirdre; Albu, Sergiu P.; Lynch, Robert P.; Buckley, Noel
Abstract:
The stability of typical vanadium flow battery (VFB) catholytes was investigated at temperatures in the range 30–60°C for VV concentrations of 1.4–2.2 mol dm−3 and sulfate concentrations of 3.6–5.4 mol dm−3. In all cases, V2O5 precipitates after an induction time, which decreases with increasing temperature. Plots of the logarithm of induction time versus the inverse of temperature (equivalent to Arrhenius plots) show excellent linearity and all have similar slopes. The logarithm of induction time also increases linearly with sulfate concentration and decreases linearly withVV concentration. The slopes of these plots give values of concentration coefficients βS and βV5 which were used to normalize induction times to reference concentrations of sulfate and VV. An Arrhenius plot of the normalized induction times gives a good straight line, the slope of which yields a value of 1.791 ± 0.020 eV for the activation energy. Combining the Arrhenius equation with the observed variation with ...
http://hdl.handle.net/10344/6236
Marked
Mark
Measurement and computer simulation of catholyte stability in vanadium flow batteries (VFBs)
(2018)
Buckley, Noel; Oboroceanu, Daniela; Quill, Nathan; Lenihan, Catherine; Ní Eidhin, Deir...
Measurement and computer simulation of catholyte stability in vanadium flow batteries (VFBs)
(2018)
Buckley, Noel; Oboroceanu, Daniela; Quill, Nathan; Lenihan, Catherine; Ní Eidhin, Deirdre; Albu, Sergiu P.; Lynch, Robert P.
Abstract:
Based on careful experimental measurements, a model for the stability of vanadium flow battery (VFB) catholytes was developed which quantifies their precipitation behavior as a function of temperature and composition. The model enables simulation of the induction time for precipitation at a temperature T for any catholyte with concentrations of sulfate and VV within the range of applicability. The results of such simulations are in good agreement with experiment. The model can predict catholyte stability using any of three alternative metrics: the induction time τ, the relative stability parameter ρ and the stability temperature TW. The induction time is a good measure of overall stability; the relative stability parameter compares the stability of any catholyte to a standard in a temperatureindependent manner; and the stability temperature estimates the upper temperature limit at which a catholyte is stable for practical purposes. Equations are derived for these parameters and the...
http://hdl.handle.net/10344/7318
Marked
Mark
Spectroscopic Measurement of State of Charge in Vanadium Flow Batteries with an Analytical Model of VIVVV Absorbance
(2016)
Petchsing, Cattleya; Quill, Nathan; Joyce, Jennifer T; Ní Eidhin, Deirdre; Oboroceanu, ...
Spectroscopic Measurement of State of Charge in Vanadium Flow Batteries with an Analytical Model of VIVVV Absorbance
(2016)
Petchsing, Cattleya; Quill, Nathan; Joyce, Jennifer T; Ní Eidhin, Deirdre; Oboroceanu, Daniela; Lenihan, Catherine; Gao, Xin; Lynch, Robert P.; Buckley, Noel
Abstract:
The ultravioletvisible spectra of catholytes for vanadium flow batteries (VFBs) were measured and analyzed for a range of VIV:VV ratios and vanadium concentrations. Using a model of V2O33+ in equilibrium with VO2+ and VO2+, the spectra were characterized in terms of an excess absorbance parameter p and the molar extinction coefficients epsilon(4) and epsilon(5) of VO2+ and VO2+, respectively. The results showed that p varies weakly with the vanadium concentration C and this variation was quantified relative to a reference concentration Cr by means of a concentration coefficient phi(r). Experimental data showed that plots of fr versus C phi(r) and plots of 1/phi(r) versus C are linear and, based on this linearity, phi(r) was expressed as a simple function of C in terms of its reference concentration Cr and a single parameter M that is independent of the choice of Cr. Standard spectra of p at a concentration C0 = 1 mol dm(3) and of epsilon(4) and epsilon(5) were generated from...
http://hdl.handle.net/10344/5129
Displaying Results 1  6 of 6 on page 1 of 1
Bibtex
CSV
EndNote
RefWorks
RIS
XML
Item Type
Doctoral thesis (1)
Journal article (5)
Year
2019 (1)
2018 (1)
2017 (1)
2016 (2)
2011 (1)
built by Enovation Solutions