1. Tungsten carbide electrocatalysts prepared from metallic tungsten nanoparticles for efficient hydrogen evolutionPlamen Stefanov, Abdullah Yildiz, Hasan Okuyucu, Saim Emin, Cesur Altinkaya, Ali Semerci, 2018, original scientific article Found in: ključnih besedah
Keywords: Tungsten carbide, Colloid, Hydrogen evolution, Overpotential, Electrocatalyst
Published: 23.05.2018; Views: 3859; Downloads: 0
 Fulltext (3,25 MB) |
2. Synthesis of molybdenum carbide thin films for production of hydrogen via electrochemical water splittingCesur Altinkaya, 2018, master's thesis Found in: ključnih besedah
Summary of found: ...molybdenum, platinum, molybdenum carbide thin films, hydrogen evolution reaction, water splitting, electrolysis, electrochemistry, pyrolysis, thin...
Keywords: molybdenum, platinum, molybdenum carbide thin films, hydrogen evolution reaction, water splitting, electrolysis, electrochemistry, pyrolysis, thin films
Published: 30.08.2018; Views: 4140; Downloads: 0
Fulltext (5,05 MB) |
3. Synthesis of tungsten carbide and platinum composite thin films for hydrogen production by electrochemical water splittingAli Semerci, 2018, master's thesis Found in: ključnih besedah
Summary of found: ...tungsten carbide, hydrogen evolution, overpotential, electro- catalyst, platinum composite...
Keywords: tungsten carbide, hydrogen evolution, overpotential, electro- catalyst, platinum composite
Published: 30.08.2018; Views: 3543; Downloads: 0
Fulltext (3,21 MB) |
4. Solvothermal synthesis of iron phosphides and their application for efficient electrocatalytic hydrogen evolutionSaim Emin, Takwa Chouki, Manel Machreki, 2020, original scientific article Abstract: Abstract
In this paper, we present a solvothermal synthesis of iron phosphide electrocatalysts using a triphenylphosphine (TPP) precursor. The synthetic protocol generates Fe2P phase at 300 °C and FeP phase at 350 °C. To enhance the catalytic activities of obtained iron phosphide particles heat-treatments were carried out at elevated temperatures. Annealing at 500 °C under reductive atmosphere induced structural changes in the samples: (i) Fe2P provided a pure Fe3P phase (Fe3P−500 °C) and (ii) FeP transformed into a mixture of iron phosphide phases (Fe2P/FeP−500 °C). Pure Fe2P films was prepared under argon atmosphere at 450 °C (Fe2P−450 °C). The electrocatalytic activities of heat-treated Fe2P−450 °C, Fe3P−500 °C, and Fe2P/FeP−500 °C catalysts were studied for hydrogen evolution reaction (HER) in 0.5 M H2SO4. The HER activities of the iron phosphide catalyst were found to be phase dependent. The lowest electrode potential of 110 mV vs. a reversible hydrogen electrode (RHE) at 10 mA cm−2 was achieved with Fe2P/FeP−500 °C catalyst.
Found in: ključnih besedah
Keywords: Solvothermal synthesis, Iron phosphide, Electrocatalyst, Hydrogen evolution, Overpotential
Published: 20.07.2020; Views: 1833; Downloads: 0
Fulltext (2,52 MB) |
5. Synthesis of efficient iron phosphide catalyst for electrocatalytic hydrogen generationTakwa Chouki, D. Lazarević, B. Donkova, Saim Emin, 2021, original scientific article Abstract: A solvothermal synthesis of iron phosphide electrocatalysts using triphenylphosphine (TPP) as phosphorus precursor
is presented. The synthetic protocol generates Fe2P/FeP phase at 350°C. After deposition of the catalyst onto graphite
substrate heat-treatment at higher temperature was carried out. Annealing at 500°C under reductive atmosphere induced
structural changes in the Fe2P/FeP samples which yielded a pure Fe2P phase. The electrocatalytic activity of the Fe2P
catalyst was studied for hydrogen evolution reaction (HER) in 0.5 M H2SO4. The recorded overpotential for HER was
about 130 mV vs. a reversible hydrogen electrode (RHE) at 10 mA cm−2
Found in: ključnih besedah
Summary of found: ...the Fe2P
catalyst was studied for hydrogen evolution reaction (HER) in 0.5 M H2SO4. The...
Keywords: solvothermal synthesis, iron phosphide, electrocatalyst, hydrogen evolution
Published: 10.05.2021; Views: 1361; Downloads: 0
Fulltext (807,89 KB) |
6. Solvothermal synthesis of iron phosphides and their application for efficient electrocatalytic hydrogen evolutionSaim Emin, Manel Machreki, Takwa Chouki, 2020, published scientific conference contribution abstract Abstract: We report the solvothermal synthesis of iron phosphide electrocatalysts using a low-cost phosphorus precursor [1]. The synthetic protocol allows for the preparation of a Fe2P phase at 300°C and FeP phase at 350°C. To enhance the catalytic activities of obtained iron phosphide particles, heat-treatments were carried out at elevated temperatures. Annealing at 500°C induced structural changes in the samples: (i) Fe2P provided a pure Fe3P phase (Fe3P−500°C) and (ii) FeP transformed into a mixture of iron phosphide phases (Fe2P/FeP−500°C). The electrocatalytic activities of heat-treated Fe2P−450°C, Fe3P−500°C, and Fe2P/FeP−500°C catalysts were studied for hydrogen evolution reaction (HER) in 0.5 M sulfuric acid (H2SO4). The HER activities of the iron phosphide catalyst were found to be phase dependent. The lowest recorded overpotential of 110 mV at 10 mA cm−2 vs. a reversible hydrogen electrode was achieved with Fe2P/FeP−500°C catalyst. The present approach allows the preparation of immobilized iron phsphide catalyst onto carbon support which is essential for application purpose. The procedure developed by us is an elegant approach to tune the composition of iron phosphide catalyst and control the morphology of particles.
Found in: ključnih besedah
Keywords: solvothermal synthesis, iron phosphide, electrocatalyst, hydrogen evolution, overpotential
Published: 13.05.2021; Views: 1360; Downloads: 0
Fulltext (4,08 MB) |
7. Mechanochemically modified composites of molybdenum disulfide and graphene oxide for hydrogen evolution reactionSandra Kurko, Ivana Stojković Simantović, Zoran Jovanović, Sara Mijaković, Blaž Belec, Željko Mravik, Jelena Rmuš, 2022, published scientific conference contribution abstract Found in: ključnih besedah
Keywords: hydrogen evolution, mechanochemistry, MoS2
Published: 16.12.2022; Views: 341; Downloads: 0
Fulltext (20,54 MB) |
8. Electrocatalytic Hydrogen Evolution with Transition Metal Based CompoundsManel Machreki, Takwa Chouki, Saim Emin, 2021, published scientific conference contribution abstract Abstract: Electrocatalytic water splitting is one of the cleanest and sustainable way to generate hydrogen. Transition metal based electrocatalysts like iron phosphides (Fe2P, FeP), molybdenum diselenides (MoSe2), and tungsten carbides (W2C, WC) have unique advantages including competitive cost compared to platinum, controllable active sites, and electronic structures that could significantly enhance the hydrogen evolution reaction (HER). Here, we present a combination of approaches for preparing catalyst materials. As an elegant technique, colloidal synthesis was used to synthesize Mo and W nanoparticles. Combined with selenization and carbidation approaches at elevated temperature, it allowed to synthesize MoSe2, W2C, and WC thin films. The syntheses of Fe2P and FeP catalyst were achieved in one-stage using triphenylphosphine precursor. The obtained catalysts were applied in electrocatalytic HER studies.
Found in: ključnih besedah
Keywords: iron phosphides
molybdenum diselenide
tungtsen carbides
electrocatalysis
hydrogen evolution
Published: 06.02.2023; Views: 239; Downloads: 0
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9. Iron phosphides as efficient electrocatalyst for hydrogen evolution and energy conversionTakwa Chouki, Saim Emin, 2021, published scientific conference contribution abstract Abstract: Transition metal phosphides have been demonstrated as outstanding multifunctional catalysts in a broad range of energy conversion technologies. We developed a solvothermal synthesis approach for iron phosphide electrocatalystsusing a low-cost phosphorus precursor.The synthetic protocol allows for the preparation of a Fe2P phase at 300°C and FeP phase at 350°C. The obtained compounds were coated on conductive substrates to prepare catalysts thin films. Here, we exploited different phases of iron phosphide as counter electrodes (CEs) in dye-sensitized solar cells (DSSCs) with an I−/I3− based electrolyte [2]. The solar-to-current conversion efficiency of the solar cells assembled with the Fe2P material reached 3.96±0.06%,which is comparable to the device assembled with a platinum (Pt) CE. In addition to DSSC
applications, the iron phosphides were used as electrocatalyst for H2 evolution (Fig. 1). To enhance the catalytic activities of obtained iron phosphide particles, heat-treatments were carried out at elevated temperatures.Annealing at 500°C induced structural changes in the samples: (i) Fe2P provided a pure Fe3P phase (Fe3P−500°C) and (ii) FeP transformed into a mixture of iron phosphide phases (Fe2P/FeP−500°C). The electrocatalytic activities for H2 evolution of heat-treated catalysts were studied in 0.5 M sulfuric acid (H2SO4). The HER activities of the iron phosphide catalyst were found to be phase dependent. The lowest recorded overpotential of 110 mV at 10 mA cm−2 vs. a reversible hydrogen electrode was achieved with Fe2P/FeP−500°C catalyst. The developed procedure is an elegant approach to tune the composition of iron phosphide catalyst and control the morphology of particles.
Found in: ključnih besedah
Keywords: Iron phosphides
electrocatalyst
hydrogen evolution
energy conversion
Published: 06.02.2023; Views: 248; Downloads: 0
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