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31.
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: osebi
Ključne besede: solvothermal synthesis, iron phosphide, electrocatalyst, hydrogen evolution, overpotential
Objavljeno: 13.05.2021; Ogledov: 167; Prenosov: 0
.pdf Polno besedilo (4,08 MB)

32.
Preparation of porous [alpha]-Fe[sub]2O[sub]3 thin films for efficient photoelectrocatalytic degradation of basic blue 41 dye
Saim Emin, Lorena Butinar, Branka Mozetič Vodopivec, Mitja Martelanc, Manel Machreki, Takwa Chouki, 2021, izvirni znanstveni članek

Opis: A novel method was developed for the preparation of porous hematite (α-Fe2O3) thin films. First, a solution containing iron precursor was spin-coated on fluorine-doped tin oxide substrate and later short heat-treated at 750 °C. The prepared α-Fe2O3 thin films were applied as dual-function catalyst in photoelectrochemical (PEC) water oxidation and textile dye degradation studies. For the first time, α-Fe2O3 thin films were used in efficient PEC degradation of a textile dye (Basic Blue 41 – B41) using in-situ generated reactive chlorine species. In comparison with photocatalytic and electrocatalytic approaches, the PEC technique allows faster degradation of B41 dye at an applied bias potential of 1.5 V versus reversible hydrogen electrode and under visible light illumination. In the presence of Cl− using the PEC approach the degradation of B41 reaches 99.8%. High-performance liquid chromatography coupled with UV–VIS system confirmed the degradation of B41 dye using PEC. Gas-chromatography coupled to mass spectrometry was used to study the by-products obtained during PEC degradation. Chemical oxygen demand analyses confirmed that the mineralization level of B41 is in the order of 68%. The α-Fe2O3 films developed in this study give a higher level of PEC degradation efficiency compared to other iron oxide-based systems.
Najdeno v: osebi
Ključne besede: thin films, photoelectrocatalysis, kinetics, visible light, degradation, textile dye
Objavljeno: 10.05.2021; Ogledov: 162; Prenosov: 1
URL Polno besedilo (0,00 KB)
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33.
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: osebi
Ključne besede: solvothermal synthesis, iron phosphide, electrocatalyst, hydrogen evolution
Objavljeno: 10.05.2021; Ogledov: 168; Prenosov: 0
.pdf Polno besedilo (807,89 KB)

34.
Electrocatalytic hydrogen evolution with textured iron phosphides thin films
Saim Emin, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: We used wet-chemistry techniques to prepare colloidal iron phosphides (F2P) nanoparticles (NPs). The synthesis of Fe2P NPs was conducted using the so called hot-matrix method [1]. The sizes of obtained Fe2P NPs are in the order of 2 - 5 nm. The colloidal Fe2P NPs are coated with hydrophobic molecules which allow preparation of stable dispersion in organic solvents like choloroform (CHCl3). The colloidal F2P NPs are very suitable for the preparation of thin films via spin-coated, spray coated or inkjet-printed on various conductive substrates. The obtained Fe2P films were used in hydrogen evolution reaction (HER). In addition, to HER the Fe2P films were used for electrocatalytic degradation of organics.
Najdeno v: osebi
Ključne besede: Fe2P, electroctalysis, thin films
Objavljeno: 13.05.2021; Ogledov: 166; Prenosov: 0
.pdf Polno besedilo (224,16 KB)

35.
Čiščenje organskih onesnaževal iz odpadnih voda in njegov vpliv na kmetijstvo
Petra Makorič, Saim Emin, 2020, druga izvedena dela

Najdeno v: osebi
Ključne besede: organiskih onesnaževal, odpadna voda, kmetijstvo
Objavljeno: 14.05.2021; Ogledov: 172; Prenosov: 0
.pdf Polno besedilo (748,77 KB)

36.
Design of a highly photocatalytically active ZnO/CuWO4 nanocomposite
Matjaz Valant, Saim Emin, 2017, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje)

Opis: We report the synthesis, photocatalytic activity and mechanistic study of a novel heterostructure (HTS) with an efficient charge separation. A ZnO/CuWO4 HTS material is reported for the first time. The nanocomposite (NC) consists of CuWO4 nanoparticles (ca. 200-400 nm) decorated with ZnO nanorods (ca. 30 nm, 100 nm length) and is shown to be a highly active photocatalyst for decomposition of model contaminants including methyl orange and terephthalic acid. The ZnO/CuWO4 interface is shown to be the key for controlling the enhanced activity of the composite material. Transient absorption spectroscopy studies demonstrated that a photoinduced charge transfer across the ZnO/CuWO4 interface increased electron-hole lifetime by 3 orders of magnitude, from < 20 s in ZnO to 30 ms in the ZnO/CuWO4 NC sample. Our findings show that through interface design efficient HTS materials can be prepared for a wide range of photocatalytic applications.
Najdeno v: osebi
Ključne besede: CuWO4, nanocomposite, transient absorption spectroscopy
Objavljeno: 28.08.2017; Ogledov: 2612; Prenosov: 0
.pdf Polno besedilo (621,87 KB)

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