11. Electrochemical ZnO-based impedimetric sensor for aqueous ammonia detection for precision animal agricultureKateryna Vyshniakova, Huiwen Bai, Victor Marco Rocha Malacco, Egon Pavlica, Richard M. Voyles, Shawn S. Donkin, Amanda Gehman, Robert A. Nawrocki, 2021, published scientific conference contribution abstract Keywords: electrochemical impedance spectroscopy, mixed conduction, organic sensor
Published in RUNG: 07.06.2021; Views: 2081; Downloads: 37
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12. Impedimetric detection of histamine using PEDOT:PSS-based organic electrochemical sensor for precision animal agricultureHuiwen Bai, Kateryna Vyshniakova, Egon Pavlica, Victor Marco Rocha Malacco, Alexandros Yiannikouris, Thirupathi Reddy Yerramreddy, Richard M. Voyles, Shawn S. Donkin, Robert A. Nawrocki, 2021, published scientific conference contribution abstract (invited lecture) Keywords: electrochemical impedance spectroscopy, mixed conduction
Published in RUNG: 07.06.2021; Views: 1924; Downloads: 37
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13. Morphology and mixing state of aged soot particles at a remote marine free troposphere site : implications for optical propertiesSwarup China, Barbara Scarnato, Robert C. Owen, Bo Zhang, MarianT. Ampadu, Sumit Kumar, Katja Džepina, Michael P. Dziobak, Paulo Fialho, Judith A. Perlinger, 2015, original scientific article Abstract: The radiative properties of soot particles depend on their morphology and mixing state, but their evolution during transport is still elusive. Here we report observations from an electron microscopy analysis of individual particles transported in the free troposphere over long distances to the remote Pico Mountain Observatory in the Azores in the North Atlantic. Approximately 70% of the soot particles were highly compact and of those 26% were thinly coated. Discrete dipole approximation simulations indicate that this compaction results in an increase in soot single scattering albedo by a factor of <= 2.17. The top of the atmosphere direct radiative forcing is typically smaller for highly compact than mass-equivalent lacy soot. The forcing estimated using Mie theory is within 12% of the forcing estimated using the discrete dipole approximation for a high surface albedo, implying that Mie calculations may provide a reasonable approximation for compact soot above remote marine clouds.
Keywords: atmospheric aerosol, soot, long-range transport, free troposphere, single scattering albedo
Published in RUNG: 11.04.2021; Views: 2099; Downloads: 0
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14. Impedimetric, PEDOT:PSS-based organic electrochemical sensor for detection of histamine for precision animal agricultureHuiwen Bai, Kateryna Vyshniakova, Egon Pavlica, Victor Marco Rocha Malacco, Alexandros Yiannikouris, Thirupathi Reddy Yerramreddy, Shawn S. Donkin, Richard M. Voyles, Robert A. Nawrocki, 2020, original scientific article Keywords: organic semiconductors, biosensor, electrochemical transistor
Published in RUNG: 18.02.2021; Views: 2322; Downloads: 140
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15. Biogenic Sources of Ice Nucleating Particles at the High Arctic Site Villum Research StationTina Šantl Temkiv, Robert Lange, David Beddows, Urška Rauter, Stephanie Pilgaard, Manuel Dall’Osto, Nina Gunde-Cimerman, Andreas Massling, Heike Wex, 2019, original scientific article Keywords: Arctic atmosphere, Arctic climate, biogenic ice nucleating particles, airborne bacteria, bioaerosols, ice nucleating particles
Published in RUNG: 04.01.2021; Views: 2548; Downloads: 0
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16. Spectroscopic insights into the electrochemical mechanism of rechargeable calcium/sulfur batteriesAntonio Scafuri, Romain Berthelot, Klemen Pirnat, Alen Vižintin, Jan Bitenc, Giuliana Aquilanti, Dominique Foix, Rémi Dedryvère, Iztok Arčon, Robert Dominko, Lorenzo Stievano, 13, original scientific article Abstract: Calcium batteries represent a promising alternative to lithium metal systems. The combination of the low redox potential and low cost and the energy-dense calcium anode (2073 mAh/cm3, similar to 2044 mAh/cm3 for Li) with appropriate low-cost cathode materials such as sulfur could produce a game-changing technology in several fields of applications. In this work, we present the reversible activity of a proof-of-concept Ca/S battery at room temperature, characterized by a surprising medium-term cycling stability with low polarization, promoted by the use of a simple positive electrode made of sulfur supported on an activated carbon cloth scaffold, and a state-of-the-art fluorinated alkoxyborate-based electrolyte. Insights into the electrochemical mechanism governing the chemistry of the Ca/S system were obtained for the first time by combining X-ray photoelectron spectroscopy and X-ray absorption spectroscopy. The mechanism implies the formation of different types of soluble polysulfide species during both charge and discharge at room temperature, and the formation of solid CaS at the end of discharge. The reversible electrochemical activity is proven by the reformation of elemental sulfur at the end of the following charge. These promising results open the way to the comprehension of emerging Ca/S systems, which may represent a valid alternative to Mg/S and Li/S batteries.
Keywords: Calcium/Sulfur Batteries
EXAFS, XANES
Published in RUNG: 17.10.2020; Views: 2922; Downloads: 0
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18. Yugoslavian Partisan Memorials: Between Memorial Genre, Revolutionary Aesthetics and Ideological RecuperationGal Kirn, Robert Burghardt, 2011, short scientific article Keywords: partisan monuments, Yugoslavia, revolutionary memory, hibridity, case studies of monument, Kozara, Petrova Gora
Published in RUNG: 20.08.2020; Views: 2732; Downloads: 0
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19. Ceramic synthesis of disordered lithium rich oxyfluoride materialsJean-Marcel Ateba Mba, Iztok Arčon, Gregor Mali, Elena Tchernychova, Ralf Witte, Robert Kruk, Miran Gaberšček, Robert Dominko, 2020, original scientific article Abstract: Disordered lithium-rich transition metal oxyfluorides with a general formula Li1þxMO2Fx (M being a transition
metal) are gaining more attention due to their high specific capacity which can be delivered from the facecentered
cubic (fcc) structure. The most common synthesis procedure involves use of mechanosynthesis. In
this work, ceramic synthesis of lithium rich iron oxyfluoride and lithium rich titanium oxyfluoride are reported.
Two ceramic synthesis routes are developed each leading to the different level of doping with Li and F and
different levels of cationic disorder in the structure. Three different Li1þxMO2Fx samples (x ¼ 0.25, 0.3 and 1) are
compared with a sample prepared by mechanochemical synthesis and non-doped LiFeO2 with fcc structure. The
obtained lithium rich iron oxyfluoride are characterized by use of M€ossbauer spectroscopy, X-ray absorption
spectroscopy, NMR and TEM. Successful incorporation of Li and F have been confirmed and specific capacity that
can be obtained from the samples is in the correlation with the level of disorder introduced with doping,
nevertheless oxidation state of iron in all samples is very similar. Conclusions obtained from lithium rich iron
oxyfluoride are validated by lithium rich titanium oxyfluoride.
Keywords: Lithium batteries
Face centered-cubic
Oxyfluoride
Li-rich
Disorder
Published in RUNG: 05.06.2020; Views: 4462; Downloads: 0
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20. Effects of a Mixed O/F Ligand in the Tavorite-Type LiVPO4O StructureSorour Semsari Parapari, Jean-Marcel Ateba Mba, Elena Tchernychova, Gregor Mali, Iztok Arčon, Gregor Kapun, Mehmet Ali Gülgün, Robert Dominko, 2020, original scientific article Abstract: We report the synthesis and detailed structural
and chemical characterization including electrochemical
properties of a lithium vanadium oxy/fluoro-phosphate
material. To the best of our knowledge, we have for the first
time synthesized a LiVPO4O-type phase with a mixed O/F
ligand. In the synthesis procedure, the LiVPO4O precursor
compound was fluorinated via LiF incorporation, with
preservation of the LiVPO4O framework structure. The
operating potential of the synthesized material is increased
compared to that of the LiVPO4O precursor (4.12 V vs 3.95 V
versus metallic lithium, respectively). The related increase in
operating potential was assigned to the effect of the
intermixing O/F ligand, which is attained via the successful
fluorine incorporation into the LiVPO4O structure. A characterization of the investigated materials was performed using
microscale-covering XRD, XANES, and NMR techniques as well as nanoscale spatially resolved imaging and analytical STEM
techniques. The obtained oxy/fluoro-phosphate phase is isostructural to LiVPO4O; however, the presence of the mixed O/F
ligand promoted a higher symmetry of vanadium octahedra. These variations of the vanadium local environment along with the
observed inhomogeneous distribution of the incorporated fluorine gave rise to the minor local deviations in vanadium valence.
Our results clearly emphasize the connection among the fluorine ligand incorporation, its local distribution, and the
electrochemical properties of the material.
Keywords: LiVPO4O, XRD, SEM, V XANES, Tavorite-Type, electrochemical properties
Published in RUNG: 17.02.2020; Views: 2921; Downloads: 0
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