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Karrab Assia,Bensimon Remi,Muller Diane,Bastide Stéphane,Cachet-Vivier Christine,Ammar Salah 한국탄소학회 2022 Carbon Letters Vol.32 No.4
This work reported the electrochemical and photoelectrochemical (PEC) properties of a new photoelectrode based on hematite Co-Fe2O3@NiO, a photoactive semiconductor, was prepared using a process involving a combination of the co-precipitation and microwave-assisted synthesis of Fe2O3, Co-Fe2O3 and Co-Fe2O3@NiO, respectively. The obtained products were characterized by X-Ray powder Diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive X-ray analysis (EDX), Ultraviolet–Visible (UV–vis) analysis, Fourier Transform Infrared spectroscopy (FT-IR). X-ray diffraction (XRD) pattern of the sample determined the crystal structure of α-Fe2O3 nanoparticles. The SEM image shows spherical nanoparticles. FTIR spectrospy spectrum confirmed the phase purity and chemical bond for the sample. Optical studies show a variation of band gap from 2.118 to 2.07 eV. The electrochemical and photoelectrochemical (PEC) performance of the films were examined by cyclic voltammetry, linear sweep voltammetry and chronoamperometry. The electrochemical oxidation of water achieved by Cobalt-doped Fe2O3@GCE modified electrode exhibited the current density of 21 mA/g at 0.5 V vs. SCE for 5 at% of Co and reveals enhanced specific capacitance of 352.11 F/g. The catalytic performance of urea oxidation was measured by cyclic voltammetry on Co-Fe2O3@NiO nanoparticles modified glassy carbon electrode (GCE) in alkaline medium. The electrode Co-Fe2O3@NiO without annealing showed a peak current density of 1.59 mA/cm2 at 0.1 M urea in 1.0 M NaOH, which was 3.6 fold higher than that of Co-Fe2O3@NiO with annealing. In another part, this work reported the photoelectrochemical (PEC) properties of photoanode prepared by spin coating. The highest photocurrent 0.042 mA/cm2 at 0.5 V Vs SCE was obtained for 5% Co-Fe2O3@NiO while the photocatalytic oxidation of urea.
Strange meson production in Al+Al collisions at 1.9 A GeV
Gasik, P.,Piasecki, K.,Herrmann, N.,Leifels, Y.,Matulewicz, T.,Andronic, A.,Averbeck, R.,Barret, V.,Basrak, Z.,Bastid, N.,Benabderrahmane, M. L.,Berger, M.,Buehler, P.,Cargnelli, M.,Č,aplar, R.,C Springer 2016 European Physical Journal A Vol.52 No.6
<P>The production of K+, K- and phi(1020) mesons is studied in Al+Al collisions at a beam energy of 1.9 A GeV which is close to or below the production threshold in NN reactions. Inverse slopes, anisotropy parameters, and total emission yields of K-+/- mesons are obtained. A comparison of the ratio of kinetic energy distributions of K- and K+ mesons to the HSD transport model calculations suggests that the inclusion of the in-medium modifications of kaon properties is necessary to reproduce the ratio. The inverse slope and total yield of phi mesons are deduced. The contribution to K- production from phi meson decays is found to be [17 +/- 3(stat)(-7)(+2) (syst)]%. The results are in line with the previous K-+/- and phi data obtained for different colliding systems at similar incident beam energies.</P>
Measurement of the In-MediumK0Inclusive Cross Section inπ−-Induced Reactions at1.15 GeV/c
Benabderrahmane, M. L.,Herrmann, N.,Wiś,niewski, K.,Kecskemeti, J.,Andronic, A.,Barret, V.,Basrak, Z.,Bastid, N.,Buehler, P.,Cargnelli, M.,Č,aplar, R.,Cordier, E.,Deppner, I.,Crochet, P.,Dup American Physical Society 2009 Physical Review Letters Vol.102 No.18
<P>The K0 meson production by pi(-) mesons of 1.15 GeV/c momentum on C, Al, Cu, Sn, and Pb nuclear targets was measured with the FOPI spectrometer at the Schwer-Ionen-Synchrotron accelerator of GSI. Inclusive production cross sections and the momentum distributions of K0 mesons are compared to scaled elementary production cross sections and to predictions of theoretical models describing the in-medium production of kaons. The data represent a new reference for those models, which are widely used for interpretation of the strangeness production in heavy-ion collisions. The presented results demonstrate the sensitivity of the kaon production to the reaction amplitudes inside nuclei and point to the existence of a repulsive KN potential of 20+/-5 MeV at normal nuclear matter density.</P>
Centrality dependence of subthresholdϕmeson production in Ni + Ni collisions at1.9AGeV
Piasecki, K.,Tymiń,ski, Z.,Herrmann, N.,Averbeck, R.,Andronic, A.,Barret, V.,Basrak, Z.,Bastid, N.,Benabderrahmane, M. L.,Berger, M.,Buehler, P.,Cargnelli, M.,Č,aplar, R.,Cordier, E.,Crochet American Physical Society 2016 Physical Review C Vol.94 No.1
<P>We analyzed the phi meson production in central Ni + Ni collisions at a beam kinetic energy of 1.93A GeV with the FOPI spectrometer and found a production probability per event of [8.6 +/- 1.6(stat) +/- 1.5(syst)] x 10(-4). This new data point allows us for the first time to inspect the centrality dependence of subthreshold phi meson production in heavy-ion collisions. The rise of phi meson multiplicity per event with mean number of participants can be parametrized by a power function with exponent alpha = 1.8 +/- 0.6. The ratio of phi to K- production yields seems not to depend, within the experimental uncertainties, on the collision centrality, and the average of measured values was found to be 0.36 +/- 0.05.</P>