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2. Photoelectrochemical Water Splitting Studies with nanostructured n and p-type semiconductor electrodesMatjaz Valant, Saim Emin, 2017, published scientific conference contribution abstract (invited lecture) Abstract: Photoelectrochemical water splitting has been demonstrated as a promising way to efficiently split water. Currently, solar-to-hydrogen conversion efficiency using state-of-the-art material combinations in PEC system is in the order of 7%. Fabrication of nanostructured materials with unique morphologies and compositions is an important factor to fully utilize the possibilities in this field. We will present different strategies for the preparation of nanostructured metal oxide thin films by using electrodeposition and wet-chemistry techniques. Focus will be given on the preparation of ZnO and CuO thin films where intermediate phases like Zn(OH)8Cl2.H2O and CuX (X=Br, Cl) were electrodeposited. Wet-chemistry synthesis techniques will be also explored for the preparation of nanostructured WO3 and a-Fe2O3 thin films. Especially, the hot-pyrolysis technique for the preparation of colloidal W and Fe/Fe-oxide nanoparticles will be shown. Spin-coating of W and Fe/Fe-oxide NPs onto optically conductive substrates and subsequent heat treatment of the obtained films was found to be a convenient way for the preparation of nanostructured WO3 and a-Fe2O3 thin films.
Found in: ključnih besedah
Keywords: photoelectrochemical water splitting, colloidal nanoparticles, semiconductor
Published: 24.10.2017; Views: 3735; Downloads: 0
 Fulltext (1,47 MB) |
3. Tungsten carbide thin films for electrochemical water splitting studiesHasan Okuyucu, Matjaz Valant, Ali Semerci, Cesur Altinkaya, Saim Emin, Abdullah Yildiz, 2017, published scientific conference contribution abstract Abstract: We used wet-chemistry techniques to prepare colloidal tungsten (W) nanoparticles (NPs). The synthesis of W NPs was conducted using the so called hot-matrix method in 1-octadecene [1]. The sizes of obtained W NPs are in the order of 2 - 5 nm. These W NPs are coated with hydrophobic molecules which allow their dispersion in organic solvents like choloroform (CHCl3). It was found that the colloidal stability of the dispersions is exceptionally high exceeding several years. The stability of W NPs which prevents coagulation allows the preparation of thin films with uniform thicknesses by spin-coating, inkjet-printing and spray coating.
We have prepared tungsten carbide (W2C, WC) thin films. The preparation of W2C and WC was achieved by spin-coating of pre-synthesized W NPs on graphite substrate and following heat treatment under Ar atmosphere at 1000 and 1450°C.
The obtained W2C and WC films were used both in electrochemical water splitting studies. We also made a composite W2C-Pt films where we used only 5 at.% of Pt. The W2C-Pt composite has shown similar performance as pure Pt-C for hydrogen (H2) evolution. In conclusion, we have developed a procedure for the synthesis of W NPs which can be applied for the preparation of tungsten carbides films and their use for electrochemical water splitting.
Found in: ključnih besedah
Keywords: water splitting, nanoparticles, hot-matrix
Published: 09.10.2017; Views: 5211; Downloads: 0
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4. Synthesis of molybdenum carbide thin films for production of hydrogen via electrochemical water splittingCesur Altinkaya, 2018, master's thesis Found in: ključnih besedah
Keywords: molybdenum, platinum, molybdenum carbide thin films, hydrogen evolution reaction, water splitting, electrolysis, electrochemistry, pyrolysis, thin films
Published: 30.08.2018; Views: 4149; Downloads: 0
Fulltext (5,05 MB) |
5. Growth of MoSe2 electrocatalyst from metallic molybdenum nanoparticles for efficient hydrogen evolutionSaim Emin, Plamen Stefanov, Burhancan Aktarla, Takwa Chouki, Boriana Donkova, 2021, original scientific article Abstract: Molybdenum diselenide (MoSe2) is an emerging alternative to platinum-group-metal electrocatalysts for the
hydrogen evolution reaction (HER). Herein, the chemical vapor deposition (CVD) approach was demonstrated to
be a successful route to grow MoSe2 thin films using colloidal molybdenum nanoparticles (Mo NPs). T
Found in: ključnih besedah
Summary of found: ... Water splitting, electrocatalyst, MoSe2...
Keywords: Water splitting, electrocatalyst, MoSe2
Published: 15.01.2021; Views: 1610; Downloads: 0
Fulltext (5,12 MB) |
6. Atomic layer deposition for the photoelectrochemical applicationsYanbo Li, Andraž Mavrič, Nadiia Pastukhova, 2021, review article Abstract: Substantial progress has been made in the photoelectrochemical (PEC) field to understand the photoelectrode behavior, semiconductor‐electrolyte interface, and photocorrosion, enabling new photoelectrode architectures with higher photocurrent, reduced photovoltage losses, and longer lifetime. Nevertheless, for practical PEC applications additional efforts are still needed to optimize all components of the photoelectrodes, including the light absorbing semiconductors, the layers for charge extraction, charge transfer, corrosion protection, and catalysis. In this regard, atomic layer deposition (ALD) offers new opportunities due to the monolayer‐by‐monolayer deposition approach, allowing preparation of conformal films with precisely controlled thickness and composition. As the ALD instruments are becoming widely accessible, this review aims to make an overview of the applications for photoelectrodes fabrication. The deposition of semiconductors onto flat and nano‐textured substrates, the deposition of ultrathin interlayers to ease charge transport by energy band alignment and surface states passivation, the deposition of corrosion protection layers, and finally, the possibilities for high catalyst dispersion is presented.
Found in: ključnih besedah
Summary of found: ...on, charge recombination, charge transfer, photocorrosion, photoelectrochemical water splitting...
Keywords: atomic layer deposition, charge recombination, charge transfer, photocorrosion, photoelectrochemical water splitting
Published: 25.02.2021; Views: 1581; Downloads: 132
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