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2.
Synthesis of molybdenum carbide thin films for production of hydrogen via electrochemical water splitting
Cesur Altinkaya, 2018, magistrsko delo

Najdeno v: ključnih besedah
Povzetek najdenega: ...molybdenum, platinum, molybdenum carbide thin films, hydrogen evolution reaction, water splitting, electrolysis, electrochemistry, pyrolysis, thin...
Ključne besede: molybdenum, platinum, molybdenum carbide thin films, hydrogen evolution reaction, water splitting, electrolysis, electrochemistry, pyrolysis, thin films
Objavljeno: 30.08.2018; Ogledov: 4140; Prenosov: 0
.pdf Polno besedilo (5,05 MB)

3.
Synthesis of tungsten carbide and platinum composite thin films for hydrogen production by electrochemical water splitting
Ali Semerci, 2018, magistrsko delo

Najdeno v: ključnih besedah
Povzetek najdenega: ...tungsten carbide, hydrogen evolution, overpotential, electro- catalyst, platinum composite...
Ključne besede: tungsten carbide, hydrogen evolution, overpotential, electro- catalyst, platinum composite
Objavljeno: 30.08.2018; Ogledov: 3547; Prenosov: 0
.pdf Polno besedilo (3,21 MB)

4.
Solvothermal synthesis of iron phosphides and their application for efficient electrocatalytic hydrogen evolution
Saim Emin, Takwa Chouki, Manel Machreki, 2020, izvirni znanstveni članek

Opis: 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.
Najdeno v: ključnih besedah
Ključne besede: Solvothermal synthesis, Iron phosphide, Electrocatalyst, Hydrogen evolution, Overpotential
Objavljeno: 20.07.2020; Ogledov: 1835; Prenosov: 0
.pdf Polno besedilo (2,52 MB)

5.
Synthesis of efficient iron phosphide catalyst for electrocatalytic hydrogen generation
Takwa Chouki, D. Lazarević, B. Donkova, Saim Emin, 2021, izvirni znanstveni članek

Opis: 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
Najdeno v: ključnih besedah
Povzetek najdenega: ...the Fe2P catalyst was studied for hydrogen evolution reaction (HER) in 0.5 M H2SO4. The...
Ključne besede: solvothermal synthesis, iron phosphide, electrocatalyst, hydrogen evolution
Objavljeno: 10.05.2021; Ogledov: 1361; Prenosov: 0
.pdf Polno besedilo (807,89 KB)

6.
Solvothermal synthesis of iron phosphides and their application for efficient electrocatalytic hydrogen evolution
Saim Emin, Manel Machreki, Takwa Chouki, 2020, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: 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.
Najdeno v: ključnih besedah
Ključne besede: solvothermal synthesis, iron phosphide, electrocatalyst, hydrogen evolution, overpotential
Objavljeno: 13.05.2021; Ogledov: 1361; Prenosov: 0
.pdf Polno besedilo (4,08 MB)

7.
Mechanochemically modified composites of molybdenum disulfide and graphene oxide for hydrogen evolution reaction
Sandra Kurko, Ivana Stojković Simantović, Zoran Jovanović, Sara Mijaković, Blaž Belec, Željko Mravik, Jelena Rmuš, 2022, objavljeni povzetek znanstvenega prispevka na konferenci

Najdeno v: ključnih besedah
Ključne besede: hydrogen evolution, mechanochemistry, MoS2
Objavljeno: 16.12.2022; Ogledov: 348; Prenosov: 0
.pdf Polno besedilo (20,54 MB)

8.
Electrocatalytic Hydrogen Evolution with Transition Metal Based Compounds
Manel Machreki, Takwa Chouki, Saim Emin, 2021, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: 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.
Najdeno v: ključnih besedah
Ključne besede: iron phosphides molybdenum diselenide tungtsen carbides electrocatalysis hydrogen evolution
Objavljeno: 06.02.2023; Ogledov: 243; Prenosov: 0
.pdf Polno besedilo (8,13 MB)
Gradivo ima več datotek! Več...

9.
Iron phosphides as efficient electrocatalyst for hydrogen evolution and energy conversion
Takwa Chouki, Saim Emin, 2021, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: 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.
Najdeno v: ključnih besedah
Ključne besede: Iron phosphides electrocatalyst hydrogen evolution energy conversion
Objavljeno: 06.02.2023; Ogledov: 250; Prenosov: 0
.pdf Polno besedilo (649,13 KB)
Gradivo ima več datotek! Več...

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