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Band gap engineering: the role of anions

Anke, Björn (2017)

The degradation of harmful organic pollutants with the help of semiconductors is regarded as one of the crucial solutions for waste water treatment. The main disadvantage of extensively used photoc...

Opto-mechanical properties of macromolecules on solid surfaces

Liebig, Tobias (2017)

In order to investigate the mechanical properties of macromolecules, the group led by Professor Rabe at the Humboldt Universität zu Berlin developed a “molecular workbench,” a set of methods and te...

Synthesis, characterization and catalytic testing of metal tungstates as catalysts for activation of lower alkanes

Li, Xuan (2017)

The electronic and structural properties of vanadium-containing phases govern the formation of isolated active sites at the surface of these catalysts for selective alkane oxidation. This concept i...

In situ observation of reactive oxygen species forming on oxygen-evolving iridium surfaces

Pfeifer, Verena; Jones, Travis E.; Velasco Vélez, Juan J.; Arrigo, Rosa; Piccinin, Simone; Hävecker, Michael; Knop-Gericke, Axel; Schlögl, Robert (2017)

Water splitting performed in acidic media relies on the exceptional performance of iridium-based materials to catalyze the oxygen evolution reaction (OER). In the present work, we use in situ X-ray...

Reactive oxygen species in iridium-based OER catalysts

Pfeifer, Verena; Jones, Travis E.; Wrabetz, Sabine; Massué, Cyriac; Velasco Vélez, Juan J.; Arrigo, Rosa; Scherzer, Michael; Piccinin, Simone; Hävecker, Michael; Knop-Gericke, Axel; Schlögl, Robert (2016)

Tremendous effort has been devoted towards elucidating the fundamental reasons for the higher activity of hydrated amorphous IrIII/IV oxyhydroxides (IrOx) in the oxygen evolution reaction (OER) in ...

What makes Xanthomonas albilineans unique amongst xanthomonads?

Pieretti, Isabelle; Pesic, Alexander; Petras, Daniel; Royer, Monique; Süssmuth, Roderich D.; Cociancich, Stéphane (2015)

Xanthomonas albilineans causes leaf scald, a lethal disease of sugarcane. Compared to other species of Xanthomonas, X. albilineans exhibits distinctive pathogenic mechanisms, ecology and taxonomy. ...

Identification of reactive oxygen species in iridium-based OER catalysts by in situ photoemission and absorption spectroscopy

Pfeifer, Verena (2017)

A change in our energy supply from fossil fuels to intermittent renewables requires energy storage capacity. Part of this capacity may be delivered from chemical energy conversion relying on H2 as ...

Noble metal nanoparticles supported in ordered mesoporous carbon coatings as efficient electrocatalysts for the hydrogen evolution reaction

Bernsmeier, Denis Robert (2017)

Hydrogen has the highest gravimetric energy density of all chemical substances. Accordingly, hydrogen is a promising candidate as a fuel or for energy storage. One efficient way to produce hydrogen...

Sugar surfactant based microemulsions at solid surfaces

Vargas Ruiz, Salome (2017)

This study investigates the structural properties of sugar surfactant-based microemulsions at solid-liquid interfaces. In particular, this thesis attempts to correlate these structural properties a...

CO2 utilisation today : report 2017

Zimmermann, Arno; Kant, Marvin; Strunge, Till; Tzimas, Evangelos; Leitner, Walter; Arlt, Wolfgang; Styring, Peter; Arning, Katrin; Ziefle, Martina; Meys, Raoul; Kätelhön, Arne; Bardow, André; Castillo Castillo, Arturo; Flanders, Nicholas; Marinić, Saša; Mechnig, Stefan-Paul (2017)

This report provides perspectives on CO2 utilisation from a variety of angles: interviews with scientists, essays on business, environment and social impact, as well as stories from CO2-utilising c...

Oxidative coupling of methane

Fleischer, Vinzenz (2017)

Nowadays, ethene is produced through steam cracking of naptha, which is a fraction of crude oil obtained after its distillation. Ethene is an important basic chemical for the chemical industry, but...

Processing, structuring, and switching of microporous polymers

Becker, Daniel (2017)

This work presents results from three different topics that stand independent from each other. If one wants to find a common denominator connecting all these topics it might be porosity. Whereas th...

Partitioning of membrane components in adhering vesicles

Steinkühler, Jan (2017)

Biological membranes are segmented into functional compartments of different length and time scales. Here we study model systems which mimic certain aspects of these multiscale phaenomena. We intro...

Unravelling ultraslow lithium-ion diffusion in γ-LiAlO2

Wiedemann, Dennis; Nakhal, Suliman; Rahn, Johanna; Witt, Elena; Islam, Mazharul M.; Zander, Stefan; Heitjans, Paul; Schmidt, Harald; Bredow, Thomas; Wilkening, Martin; Lerch, Martin (2016)

Lithium aluminum oxide (γ-LiAlO2) has been discussed and used for various applications, e.g., as electrode coating, membrane, or tritium breeder material. Although lithium-ion diffusion in this sol...

Extended defects in PVT-grown AlN

Langhans, Frank (2016)

The possibility of industrial fabrication of devices based on aluminium nitride bulk crystals is on the one hand limited by the small diameter of state of the art bulk crystals and on the other han...

Quantum chemical studies of transition-metal complexes and aqueous solvent effects

Theilacker, Kolja (2016)

Thanks to the rapid development in the area of computer hardware, and appreciable advances in algorithms and theoretical chemistry methods, quantum chemical calculations have become a crucial tool ...

Adaptation of E. coli towards tryptophan analog usage

Oehm, Stefan (2016)

The presented study set out to change the amino acid set of the genetic code in two different Trp-auxotrophic E. coli strains with the help of the serial transfer regime under constant evolutionary...

Nonlinear nonequilibrium dynamics in a nematic liquid crystal

Stieger, Tillmann (2016)

Liquid crystals are elongated molecules with a rich and surprising phase behavior. Nonequilibrium conditions open a myriad possibilities of manipulating matter, and reach collective states not acce...

Development of local hybrid functionals for time-dependent density functional theory

Maier, Toni Mike (2016)

The present work is concerned with the advancement of the relatively recent class of local hybrid functionals. The first part of the work addresses the conjunction of local hybrid functionals with ...

Depolymerisation von Polysiloxanen und die eisenvermittelte Aktivierung kleiner Moleküle

Döhlert, Peter (2016)

Die vorliegende Arbeit umfasst im ersten Teil Studien zum Recycling von Polysiloxanen. Dazu wurde ein Protokoll zur Depolymerisation entwickelt, bei dem ein Depolymerisationsreagenz und ein Lewis S...