21. Galvanostatic charge/discharge of thermally treated and ion-beam irradiated graphene oxide/12-tungstophosphoric acid nanocompositesŽeljko Mravik, Jelena Rmuš, Blaž Belec, Andrzej Olejniczak, Nikita Kirilkin, Nemanja Gavrilov, Vladimir Skuratov, Zoran Jovanivić, 2022, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: graphene, tungsten, nanocoposites
Objavljeno v RUNG: 16.12.2022; Ogledov: 1981; Prenosov: 0
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22. Mechanochemically modified composites of molybdenum disulfide and graphene oxide for hydrogen evolution reactionJelena Rmuš, Blaž Belec, Željko Mravik, Sara Mijaković, Zoran Jovanović, Ivana Stojković Simantović, Sandra Kurko, 2022, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: hydrogen evolution, mechanochemistry, MoS2
Objavljeno v RUNG: 16.12.2022; Ogledov: 1864; Prenosov: 0
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29. Plastic Waste Precursor-Derived Fluorescent Carbon and Construction of Ternary FCs@CuO@TiO2 Hybrid Photocatalyst for Hydrogen Production and Sensing ApplicationAkansha Metha, Rayees Ahmad Rather, Blaž Belec, Sandra Gardonio, Ming Fang, Matjaž Valant, 2022, izvirni znanstveni članek Opis: A sustainable nexus between renewable energy production and plastic abatement is imperative for overall sustainable development. In this regard, this study aims to develop a cheaper and environmentally friendly nexus between plastic waste management, wastewater treatment, and renewable hydrogen production. Fluorescent carbon (FCs) were synthesized from commonly used LDPE (low-density polyethylene) by a facile hydrothermal approach. Optical absorption study revealed an absorption edge around 300 nm and two emission bands at 430 and 470 nm. The morphological analysis showed two different patterns of FCs, a thin sheet with 2D morphology and elongated particles. The sheet-shaped particles are 0.5 μm in size, while as for elongated structures, the size varies from 0.5 to 1 μm. The as-synthesized FCs were used for the detection of metal ions (reference as Cu2+ ions) in water. The fluorescence intensity of FCs versus Cu2+ ions depicts its upright analytical ability with a limit of detection (LOD) reaching 86.5 nM, which is considerably lesser than earlier reported fluorescence probes derived from waste. After the sensing of Cu2+, the as-obtained FCs@Cu2+ was mixed with TiO2 to form a ternary FCs@CuO@TiO2 composite. This ternary composite was utilized for photocatalytic hydrogen production from water under 1.5 AM solar light irradiation. The H2 evolution rate was found to be ~1800 μmolg−1, which is many folds compared to the bare FCs. Moreover, the optimized FCs@CuO@TiO2 ternary composite showed a photocurrent density of ~2.40 mA/cm2 at 1 V vs. Ag/AgCl, in 1 M Na2SO4 solution under the illumination of simulated solar light. The achieved photocurrent density corresponds to the solar-to-hydrogen (STH) efficiency of ~0.95%. The efficiency is due to the fluorescence nature of FCs and the synergistic effect of CuO embedded in TiO2, which enhances the optical absorption of the composite by reaching the bandgap of 2.44 eV, apparently reducing the recombination rate, which was confirmed by optoelectronic, structural, and spectroscopic characterizations.
Ključne besede: plastic waste, fluorescent carbo, sensing of metal ions, photocatalytic hydrogen production
Objavljeno v RUNG: 25.02.2022; Ogledov: 2576; Prenosov: 49
 Celotno besedilo (5,98 MB) |
30. Silica coated Bi[sub]2Se[sub]3 topological insulator nanoplatelets : the way of making them colloidally stable but preserving their optical propertiesBlaž Belec, Nina Kostevšek, Sebastjan Nemec, Slavko Kralj, Sandra Gardonio, Mattia Fanetti, Matjaž Valant, 2021, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: topological insulator, optical properties, topological surface states, silica-coated
Objavljeno v RUNG: 27.09.2021; Ogledov: 3414; Prenosov: 0
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