Light emission from heteronuclear Ar-Kr doubly ionized excimer molecules

Light emission from a  ~100 mbar Ar-Kr mixture excited by a pulsed discharge is described. The discharge was arranged to form a homogeneous cathode layer and spatial filtering was used to measure time-dependent spectra emitted from a region where electrons accelerated in the cathode sheath induce the light emission. Novel excimer bands were observed around a wavelength of 315 nm in addition to the better known so called third excimer continua of Ar and Kr. A tentative assignment for these bands to charge-transfer transitions: ArKr2+ →  Kr+ +  Ar+ + hν is provided and discussed in the context of earlier works on heteronuclear ionic excimer molecules. Predictions for the wavelength positions of similar emission bands are provided for other combinations of noble gases. The rate constants for the formation of heteronuclear ArKr2+ excimers in three-body reactions and two-body collisional quenching of Kr2+∗ ions by Ar atoms have been determined from the time dependence of the ArKr2+ emission

Data of oxygen reduction reaction on Pd nanocatalysts prepared by plasma-assisted synthesis on different carbon nanomaterials

This dataset contains the data presented in the figures of published paper "Oxygen reduction reaction on Pd nanocatalysts prepared by plasma-assisted synthesis on different carbon nanomaterials" Nanotechnology 32 035401 (https://doi.org/10.1088/1361-6528/abbd6f

Cobalt-Containing Nitrogen-Doped Carbon Materials Derived from Saccharides as Efficient Electrocatalysts for Oxygen Reduction Reaction

The development of non-precious metal electrocatalysts towards oxygen reduction reaction (ORR) is crucial for the commercialisation of polymer electrolyte fuel cells. In this work, cobalt-containing nitrogen-doped porous carbon materials were prepared by a pyrolysis of mixtures of saccharides, cobalt nitrate and dicyandiamide, which acts as a precursor for reactive carbon nitride template and a nitrogen source. The rotating disk electrode (RDE) experiments in 0.1 M KOH solution showed that the glucose-derived material with optimised cobalt content had excellent ORR activity, which was comparable to that of 20 wt% Pt/C catalyst. In addition, the catalyst exhibited high tolerance to methanol, good stability in short-time potential cycling test and low peroxide yield. The materials derived from xylan, xylose and cyclodextrin displayed similar activities, indicating that various saccharides can be used as inexpensive and sustainable precursors to synthesise active catalyst materials for anion exchange membrane fuel cells

Temporal response of UV sensors made of highly oriented diamond films by 193 and 313 nm laser pulses

International audienceUltraviolet sensors were fabricated on a Si substrate using an undoped, highly oriented diamond film with Pt and Al interdigited electrodes with a gap length of 5, 10 and 15 m. Transient voltage outputs due to photocurrent of the sensors under Ž a bias voltage of 20, 40 and 80 V were measured by the pulsed irradiation of an ArF excimer laser s 193 nm, pulse widths 5. Ž. ns or a dye laser s 313 nm, pulse widths 7 ns. It was found that the transient voltage output by the ArF laser irradiation on Ž. a sensor Pt electrodes with a 15-m gap consisted of main and second peaks at 1.1 and 3.8 ns, respectively, when the bias voltage was 20 V. The FWHM was approximately 4 ns. The second peak was observed in the output signals of most sensors. On the other hand, the voltage output was two orders of magnitude weaker when the sensors were irradiated by the dye laser

Cobalt-Containing Nitrogen-Doped Carbon Materials Derived from Saccharides as Efficient Electrocatalysts for Oxygen Reduction Reaction

The development of non-precious metal electrocatalysts towards oxygen reduction reaction (ORR) is crucial for the commercialisation of polymer electrolyte fuel cells. In this work, cobalt-containing nitrogen-doped porous carbon materials were prepared by a pyrolysis of mixtures of saccharides, cobalt nitrate and dicyandiamide, which acts as a precursor for reactive carbon nitride template and a nitrogen source. The rotating disk electrode (RDE) experiments in 0.1 M KOH solution showed that the glucose-derived material with optimised cobalt content had excellent ORR activity, which was comparable to that of 20 wt% Pt/C catalyst. In addition, the catalyst exhibited high tolerance to methanol, good stability in short-time potential cycling test and low peroxide yield. The materials derived from xylan, xylose and cyclodextrin displayed similar activities, indicating that various saccharides can be used as inexpensive and sustainable precursors to synthesise active catalyst materials for anion exchange membrane fuel cells

Data of transition metal phthalocyanine-modified shungite-based cathode catalysts for alkaline membrane fuel cell

This dataset contains the data presented in the figures of pulbished paper "Transition metal phthalocyanine-modified shungite-based cathode catalysts for alkaline membrane fuel cell" International Journal of Hydrogen Energy 46, 4365-4377 (https://doi.org/10.1016/j.ijhydene.2020.10.231) The electrochemical characterisation data, which was measured in University of Tartu Institute of Chemistry, is for Figures 5, 6, 7, 9, 10, S2, S3, S4 and the nomenclature of the catalysts is the same as in the mentioned article

Data of Iron-Containing Nitrogen-Doped Carbon Nanomaterials Prepared via NaCl Template as Efficient Electrocatalysts for the Oxygen Reduction Reaction

The dataset contains the data presented in the figures of published paper: "Iron-Containing Nitrogen-Doped Carbon Nanomaterials Prepared via NaCl Template as Efficient Electrocatalysts for Oxygen Reduction Reaction", ChemElectroChem 8 (2021) 2288-2297 (https://doi.org/10.1002/celc.202100571

Data of polypyrrole and polythiophene modified carbon nanotube-based cathode catalysts for anion exchange membrane fuel cell

This dataset contains the data presented in the figures of pulbished paper "Polypyrrole and polythiophene modified carbon nanotube-based cathode catalysts for anion exchange membrane fuel cell" ChemElectroChem 9 e202200161 (https://doi.org/10.1002/celc.202200161) The electrochemical characterisation data, which was measured in University of Tartu Institute of Chemistry, is for Figures 1,2,3a,4a, 9, S1 and the nomenclature of the catalysts is the same as in the mentioned article