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1.
Efficient electrochemical nitrogen fixation at iron phosphide (Fe_2P) catalyst in alkaline medium
Beata Rytelewska, Anna Chmielnicka, Takwa Chouki, Magdalena Skunik-Nuckowka, Shaghayegh Naghdi, Dominik Eder, Aleksandra Michalowska, Tomasz Ratajczyk, Egon Pavlica, Saim Emin, 2023, original scientific article

Abstract: A catalytic system based on iron phosphide (Fe2P) has exhibited electrocatalytic activity toward N2-reduction reaction in alkaline medium (0.5 mol dm−3 NaOH). Based on voltammetric stripping-type electroanalytical measurements, Raman spectroscopic and spectrophotometric data, it can be stated that the Fe2P catalyst facilitates conversion of N2 to NH3, and the process is fairly selective with respect to the competing hydrogen evolution. A series of diagnostic electrocatalytic experiments (utilizing platinum nanoparticles and HKUST-1) have been proposed and performed to control purity of nitrogen gas and to probe presence of potential contaminants such as ammonia, nitrogen oxo-species and oxygen. On the whole, the results are consistent with the view that the interfacial reduced-iron (Fe0) centers, while existing within the network of P sites, induce activation and reduction of nitrogen, parallel to the water splitting (reduction) to hydrogen. It is apparent from Tafel plots and impedance measurements that mechanism and dynamics of nitrogen reduction depends on the applied electroreduction potential. The catalytic system exhibits certain tolerance with respect to the competitive hydrogen evolution and gives (during electrolysis at -0.4 V vs. RHE) the Faradaic efficiency, namely, the selectivity (molar) efficiency, toward production of NH3 on the level of 60%. Under such conditions, the NH3-yield rate has been found to be equal to 7.5 µmol cm−2 h−1 (21 µmol m−2 s−1). By referring to classic concepts of electrochemical kinetic analysis, the rate constant in heterogeneous units has been found to be on the moderate level of 1-2*10−4 cm s−1 (at -0.4 V). The above mentioned iron-phosphorous active sites, which are generated on surfaces of Fe2P particles, have also been demonstrated to exhibit strong catalytic properties during reductions of other electrochemically inert reactants, such as oxygen, nitrites and nitrates.
Keywords: nitrogen reduction, alkaline medium, iron phosphide catalyst, ammonia, electrochemical determinations
Published in RUNG: 30.11.2023; Views: 511; Downloads: 3
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2.
Wavelength-resolved reverberation mapping of quasar CTS C30.10: Dissecting Mg II and Fe II emission regions
Raj Prince, Michal Zajaček, Bożena Czerny, Piotr Trzcionkowski, Mateusz Bronikowski, Catalina Sobrino Figaredo, Swayamtrupta Panda, Mary Loli Martinez-Aldama, Krzysztof Hryniewicz, Vikram Kumar Jaiswal, Marzena Śniegowska, Mohammad-Hassan Naddaf, Maciej Bilicki, Martin Haas, Marek Jacek Sarna, Vladimir Karas, Aleksandra Olejak, Robert Przyłuski, Mateusz Rałowski, Andrzej Udalski, Ramotholo R. Sefako, Anja Genade, Hannah L. Worters, 2022, original scientific article

Abstract: Context. We present the results of the reverberation monitoring of the Mg II broad line and Fe II pseudocontinuum for the luminous quasar CTS C30.10 (z = 0.90052) with the Southern African Large Telescope in 2012–2021. Aims. We aimed at disentangling the Mg II and UV Fe II variability and the first measurement of UV Fe II time delay for a distant quasar. Methods. We used several methods for the time-delay measurements and determined the Fe II and Mg II time delays. We also performed a wavelength-resolved time delay study for a combination of Mg II and Fe II in the 2700–2900 Å rest-frame wavelength range. Results. We obtain a time delay for Mg II of 275.5−19.5+12.4 days in the rest frame, and we have two possible solutions of 270.0−25.3+13.8 days and 180.3−30.0+26.6 in the rest frame for Fe II. Combining this result with the old measurement of Fe II UV time delay for NGC 5548, we discuss for first time the radius-luminosity relation for UV Fe II with the slope consistent with 0.5 within the uncertainties. Conclusions. Because the Fe II time delay has a shorter time-delay component but the lines are narrower than Mg II, we propose that the line-delay measurement is biased toward the part of the broad line region (BLR) facing the observer. The bulk of the Fe II emission may arise from the more distant BLR region, however, the region that is shielded from the observer.
Keywords: accretion, accretion disks / quasars: emission lines / quasars: individual: CTS C30.10 / techniques: spectroscopic / techniques: photometric
Published in RUNG: 13.11.2023; Views: 540; Downloads: 3
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3.
Poročilo skupine strokovnjakov : vzorčna evalvacija študijskega programa
Katja Mihurko Poniž, Aleksandra Golubović, Tilen Tajnik, 2021, expertise, arbitration decision

Keywords: visoko šolstvo, študijski programi, akreditacija, kakovost
Published in RUNG: 27.06.2022; Views: 1087; Downloads: 0
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Zbornik prispevkov s simpozija 2013
2015, proceedings of peer-reviewed scientific conference contributions (domestic conferences)

Keywords: slavistika, slovenščina, zgodovina jezika, primerjalno jezikoslovje, slovenska dialektologija, leksikografija, kulturološke študije, stilistika, zborniki
Published in RUNG: 15.01.2019; Views: 3320; Downloads: 221
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6.
Zbornik prispevkov s simpozija 2017
2018, proceedings of peer-reviewed scientific conference contributions (domestic conferences)

Abstract: V zborniku Škrabčevi dnevi 10 je zbranih štirinajst prispevkov s simpozija 2017. Objavljeni prispevki so bili strokovno pregledani, recenzirali so jih strokovnjaki z vseh tematskih področij zbornika. Vsebinsko segajo v dialektologijo, nevrolingvistiko, sinhrono jezikoslovje - glasoslovje, oblikoslovje, leksikografijo in normativistiko, zgodovinsko jezikoslovje, problematiko furlanskega kulturnega delovanja in skladnjo znakovnega jezika.
Keywords: dialektologija, nevrolingvistika, glasoslovje, oblikoslovje, leksikografija, normativistika
Published in RUNG: 15.01.2019; Views: 3412; Downloads: 251
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7.
Anketa o delu in življenju sodobnih slovenskih literarnih prevajalk in prevajalcev
2017, interview

Keywords: prevajalci, literarno prevajanje, prevajanje, literatura
Published in RUNG: 21.12.2017; Views: 5158; Downloads: 0
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