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  • 1
    Language: English
    In: Chemical communications (Cambridge, England), 11 July 2015, Vol.51(54), pp.10914-6
    Description: Understanding electron mobility on TiO2 is crucial because of its applications in photocatalysis and solar cells. This work shows that shallow traps believed to be involved in electron migration in TiO2 conduction band are formed upon band gap excitation, i.e., are not pre-existing states. The shallow traps in TiO2 results from large polarons and are not restricted to surface.
    Keywords: Conduction Band ; Titanium Dioxide ; Solar Cells ; Anatase ; Polarons ; Hunting ; Electron Mobility ; Migration ; Miscellaneous Sciences (So) ; Chemical and Electrochemical Properties (MD) ; Chemical and Electrochemical Properties (Ep) ; Chemical and Electrochemical Properties (Ed) ; Chemical and Electrochemical Properties (EC);
    ISSN: 13597345
    E-ISSN: 1364-548X
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  • 2
    In: Physical Chemistry Chemical Physics, 2015, Vol.17(28), pp.18262-18264
    Description: We report on the reactivity of grafted tantalum organometallic catalysts with molecular oxygen. The changes in the local Ta electronic structure were followed by in situ high-energy resolution off-resonant spectroscopy (HEROS). The results revealed agglomeration and formation of Ta dimers, which cannot be reversed. The process occurs independently of starting grafted complex.
    Keywords: Tantalum ; Reactivity ; Silicon-Dioxide ; Molecular-Oxygen ; Agglomeration ; Spectrometry ; Electronic-Structure ; Tantal ; Chemisches Reaktionsvermögen ; Siliciumdioxid ; Molekularer Sauerstoff ; Agglomerieren ; Spektroskopie ; Elektronische Struktur ; Chemistry;
    ISSN: 1463-9076
    E-ISSN: 1463-9084
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  • 3
    In: Physical Chemistry Chemical Physics, 2012, Vol.14(7), pp.2164-2170
    Description: An autoclave reactor was modified to perform simultaneously high energy resolution fluorescence detected X-ray absorption spectroscopy (HERFD XAS) and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy measurements without altering the reactor design. This operando cell allows one to follow changes in the electronic and geometric structure of the catalyst with HERFD XAS and relate them to the simultaneously detected activity and reaction species with ATR-FTIR formed during the reaction in the liquid phase. The capability of the cell is demonstrated by two studies. The first shows the reduction of Au/CeO 2 precursors in different solvents. The second shows that mainly Au 0 is present in the hydrogenation of nitrobenzene over Au/CeO 2 .
    Keywords: Autoclaves ; Electronics ; Fluorescence ; Gold ; Nitrobenzenes ; Reactor Design ; Reactors ; Reduction ; Miscellaneous Sciences (So);
    ISSN: 1463-9076
    E-ISSN: 1463-9084
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  • 4
    In: Chemical Communications, 2015, Vol.51(54), pp.10914-10916
    Description: Understanding electron mobility on TiO 2 is crucial because of its applications in photocatalysis and solar cells. This work shows that shallow traps believed to be involved in electron migration in TiO 2 conduction band are formed upon band gap excitation, i.e. , are not pre-existing states. The shallow traps in TiO 2 results from large polarons and are not restricted to surface.
    ISSN: 1359-7345
    E-ISSN: 1364-548X
    Source: Royal Society of Chemistry
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  • 5
    Language: English
    In: Angewandte Chemie International Edition, 26 September 2016, Vol.55(40), pp.12306-12310
    Description: For the first time, organic semiconducting polymer dots (Pdots) based on poly[(9,9′‐dioctylfluorenyl‐2,7‐diyl)‐co‐(1,4‐benzo‐{2,1′,3} thiadiazole)] (PFBT) and polystyrene grafting with carboxyl‐group‐functionalized ethylene oxide (PS‐PEG‐COOH) are introduced as a photocatalyst towards visible‐light‐driven hydrogen generation in a completely organic solvent‐free system. With these organic Pdots as the photocatalyst, an impressive initial rate constant of 8.3 mmol h g was obtained for visible‐light‐driven hydrogen production, which is 5‐orders of magnitude higher than that of pristine PFBT polymer under the same catalytic conditions. Detailed kinetics studies suggest that the productive electron transfer quench of the excited state of Pdots by an electron donor is about 40 %. More importantly, we also found that the Pdots can tolerate oxygen during catalysis, which is crucial for further application of this material for light‐driven water splitting. were used as a photocatalyst for visible‐light‐driven hydrogen generation for the first time and showed impressive activity with an initial hydrogen generation rate of 8.3 mmol h g without the assistance of any co‐catalysts. Do=donor.
    Keywords: Co-Solvent-Free ; Hydrogen Generation ; Photocatalysts ; Polymer Dots ; Visible Light
    ISSN: 1433-7851
    E-ISSN: 1521-3773
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  • 6
    Language: English
    In: The Analyst, 2015, Vol.140(18), pp.6234-6238
    Description: Microliquid jets have many applications, in particular in the fields of spectroscopy/analysis of samples susceptible to beam damage. Herein, we report a microliquid jet, manufactured with 3D printing technology, with a tuneable nozzle diameter output....
    Keywords: Natural Sciences ; Chemical Sciences ; Naturvetenskap ; Kemi
    ISSN: 0003-2654
    E-ISSN: 13645528
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  • 7
    Language: English
    In: Journal of Catalysis, 2017, Vol.353, pp.116-122
    Description: In this work, we report for the first time a unique configuration of N-doped and Cu-doped TiO2 bilayer. The activity of TiO2 was improved by combining Cu- and N-doping in a layered thin-film structure. The impact of the stacking order was studied, pointing out how the best arrangement is by far the one...
    Keywords: Natural Sciences ; Chemical Sciences ; Naturvetenskap ; Kemi ; N-Tio2/Cu-Tio2 Films ; Stacking Order ; Photocatalytic Oxidation
    ISSN: 0021-9517
    E-ISSN: 10902694
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  • 8
    In: Catalysis Science & Technology, 2017, Vol.7(5), pp.1050-1054
    Description: This study reports the changes in the platinum electronic structure induced by a strong electric field originated from quasi half-cycle THz pulses, which forces the CO molecule to dissociate. The changes could be rationalized via a simple analysis of the local density-of-states and easily characterised via high resolution X-ray absorption spectroscopy (HR-XAS). Thus, conferring half-cycle THz pulses the capability of triggering dark catalytic processes required to follow real time catalytic bond rupture or formation, i.e. , time-resolved measurements using THz as the pump and HR-XAS as the probe.
    Keywords: Catalysis ; X-Ray ; Timing-Measurement ; Electric-Field ; Absorption-Spectrometry ; Electronic-Structure ; Platinum ; Electric-Field-Strength ; Katalyse ; X-Strahl ; Zeitmessung ; Elektrisches Feld ; Absorptionsspektroskopie ; Elektronische Struktur ; Platin ; Elektrische Feldstärke ; Chemistry;
    ISSN: 2044-4753
    E-ISSN: 2044-4761
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  • 9
    Language: English
    In: Journal of Photochemistry and Photobiology A, 2017, Vol.335, pp.36-39
    Description: Photo-catalysis is an emerging technology for clean energy production, organic synthesis and environmental protection, etc. While there is a hydrogen of systems and schemes to attain these objectives, there is a paucity of photo-reactors capable of determine...
    Keywords: Natural Sciences ; Chemical Sciences ; Physical Chemistry ; Naturvetenskap ; Kemi ; Fysikalisk Kemi ; Photo-Reactor ; Fast Analysis ; Fast-Screening ; Combined Spectroscopy
    ISSN: 1010-6030
    E-ISSN: 18732666
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  • 10
    Language: English
    In: Materials Today, 2018, Vol. 21(6), pp. 590-593
    Description: Light-driven proton-coupled electron transfer (PCET) reactions on nanoplasmonics would bring temporal control of their reactive pathways, in particular, prolong their charge separation state. Using a silver nano-hybrid plasmonic structure, we observed that optical excitation of Ag-localized surface plasmon instigated electron injection into TiO2 conduction band and oxidation of isopropanol alcoholic functionality. Femtosecond transient infrared absorption studies show that electron transfer from Ag to TiO2 occurs in ca. 650 fs, while IPA molecules near the Ag surface undergo an ultrafast bidirectional PCET step within 400 fs. Our work demonstrates that ultrafast PCET reaction plays a determinant role in prolonging charge separation state, providing an innovative strategy for visible-light photocatalysis with plasmonic nanostructures.
    Keywords: Natural Sciences ; Chemical Sciences ; Physical Chemistry ; Naturvetenskap ; Kemi ; Fysikalisk Kemi ; Engineering And Technology ; Teknik Och Teknologier
    ISSN: 1369-7021
    E-ISSN: 18734103
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