A5047105010- Nanomaterials for catalytic reactions
- Catalytic Processes in Materials Science
- Perovskite Materials and Applications
- Cultural Insights and Digital Impacts
- Copper-based nanomaterials and applications
- Catalysis for Biomass Conversion
- Advanced Photocatalysis Techniques
- Open Education and E-Learning
- scientometrics and bibliometrics research
- Catalysis and Hydrodesulfurization Studies
- Quantum Dots Synthesis And Properties
- Innovative Microfluidic and Catalytic Techniques Innovation
- Electrocatalysts for Energy Conversion
- Chalcogenide Semiconductor Thin Films
- Ionic liquids properties and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Environmental remediation with nanomaterials
- French Urban and Social Studies
- Surface Chemistry and Catalysis
- Solar-Powered Water Purification Methods
- Advanced NMR Techniques and Applications
- Advanced Condensed Matter Physics
- Healthcare Systems and Practices
- Big Data and Business Intelligence
- Research Data Management Practices
University of Lausanne
2018
University of Cambridge
2016-2018
École Polytechnique Fédérale de Lausanne
2008-2016
Tianjin University
2008
Peking University
2008
Beijing National Laboratory for Molecular Sciences
2008
Lead-halide perovskites have emerged as high-performance photovoltaic materials. We mapped the propagation of photogenerated luminescence and charges from a local photoexcitation spot in thin films lead tri-iodide perovskites. observed light emission at distances ≥50 micrometers found that peak internal photon spectrum red-shifts 765 to ≥800 nanometers. used lateral-contact solar cell with selective electron- hole-collecting contacts charge extraction for >50 away arose repeated recycling...
The activity and selectivity of structure-sensitive reactions are strongly correlated with the shape size nanocrystals present in a catalyst. This correlation can be exploited for rational catalyst design, especially if each type surface atom displays different behavior, to attain highest selectivity. In this work, uniform Pd cubic (in two sizes), octahedral, cuboctahedral shapes were synthesized through solution-phase method poly(vinyl pyrrolidone) (PVP) serving as stabilizer then tested...
This review provides an overview of the recent achievements in catalytic process development for alkyne hydrogenations. It underlines necessity simultaneous optimization over different length scales from molecular/nanoscale active phase, up-to macro-scale reactor design. One case study, hydrogenation 2-methyl-3-butyn-2-ol, is analyzed detail to illustrate practical application this approach. Finally, it presents personal view authors concerning new trends and paths available field.
Abstract Lead-halide perovskites have triggered the latest breakthrough in photovoltaic technology. Despite great promise shown by these materials, their instability towards water even presence of low amounts moisture makes them, a priori , unsuitable for direct use as light harvesters aqueous solution production hydrogen through splitting. Here, we present simple method that enables photoelectrocatalytic evolution while immersed an solution. Field’s metal, fusible InBiSn alloy, is used to...
Poly(vinylpyrrolidone) (PVP)-stabilized Pd nanocubes were synthesized, deposited on a carbon-based support, and subsequently treated with UV–ozone (UVO) in order to eliminate the traces of PVP still present surface. Cubes, being thermodynamically unfavorable shape, are very prone restructuring minimize interfacial free energy thus allow assessment their morphological stability during UVO cleaning. The process removal was monitored by X-ray photoelectron spectroscopy (XPS), diffraction (XRD)...
Abstract Strong interest exists in the development of organic–inorganic lead halide perovskite photovoltaics and photoelectrochemical (PEC) tandem absorber systems for solar fuel production. However, their scalability durability have long been limiting factors. In this work, it is revealed how both fields can be seamlessly merged together, to obtain scalable, bias‐free water splitting devices. For purpose, state‐of‐the‐art cesium formamidinium methylammonium (CsFAMA) triple cation mixed...
The gas phase (1 atm, 453 K) hydrogenation of p-chloronitrobenzene (p-CNB) over a series laboratory-synthesized and commercial Pd (1–10% wt) supported on activated carbon (AC) non-reducible (SiO2 Al2O3) reducible (ZnO) oxides has been examined. Reaction these catalysts generated the target p-chloroaniline (p-CAN) (via selective hydrogenation) nitrobenzene (NB)/aniline (AN) as result combined hydrodechlorination/hydrogenation. A range nanoparticles with mean sizes 2.4–12.6 nm (from HRTEM...
Polyvinyl pyrrolidone stabilized rhodium nanoparticles are highly soluble in hydroxyl-functionalized ionic liquids, providing an effective and stable catalytic system. In hydrogenation reactions, excellent results were obtained, transmission electron microscopy, solubility determinations, leaching experiments employed to quantify the advantages of this
The protection and activation of fragile semiconductor electrodes catalysts for efficient stable solar water splitting is reviewed.
This interdisciplinary work combines the use of shape- and size-defined Pd nanocrystals (cubes 10 18 nm, octahedra 37 nm) with in situ techniques DFT calculations to unravel dynamic phenomena respect reconstruction taking place during acetylene hydrogenation. Notably, it was found that reacting surface evolved at a different pace depending on shape nanocrystals, due their specific propensity form carbides under reaction conditions. Indeed, cubes (Pd(100)) reacted PdC0.13 phase rate roughly...
Substantial signal enhancements achieved by using parahydrogen in catalytic hydrogenations are powerful tools for mechanistic studies of chemical reactions involving molecular H2. Potentially, this technique can be extended to other reaction classes, providing new information about mechanisms. Moreover, lead substances with highly polarized spins. Herein, we report strong oligomerization products observed during the selective hydrogenation acetylene over Pd nanoparticles different shapes and...
In the frame of DFT paradigms, adsorption 2-methyl-3-butyn-2-ol (MBY) and 2-methyl-3-buten-2-ol (MBE) on a Pd30 cluster, including both {100} {111} faces, was studied along with pathways involved in hydrogenation, taking place plane low coordination (corner/edge) sites given MBY/Pd30 MBE/Pd30 surface configurations. The calculated energetics, further validated by gas-phase water-assisted MBY MBE performed well-defined size shape-controlled Pd nanoparticles supported SiO2, were able to...
Abstract The structure sensitivity of acetylene hydrogenation was studied over size‐controlled cubic and octahedral Pd nanocrystals (NCs) supported on ZnO SiO 2 . Acetylene found to be sensitive [with Pd(1 1 1) in octahedra being more active than 0 0) cubes]. However, the response vary depending redox properties support. catalytically selective palladium carbide (PdC x ) phase readily formed ‐supported NCs (much faster cubes octahedra), whereas a markedly less PdZn preferentially...
The integrated approach for the design of solid catalysts process intensification is presented addressing simultaneously different levels scale and complexity involved in development starting from molecular/nano-scale active phase optimization up to macro-scale catalytic reactor design. feasibility this demonstrated through case studies carried out our group.
The relationship between catalytic response and properties of the active phase is difficult to establish in classical heterogeneous catalysis due number variables that can affect performance. Ultrahigh-vacuum surface methods applied model catalyst surfaces are useful tools assess fundamental issues related processes but they limited by significant differences with catalysts working state. In an attempt overcome this issue, (unsupported) nano-metal systems controlled size shape have been...
We mapped the propagation of photogenerated luminescence and charges from a local photoexcitation spot in thin films lead tri-iodide perovskites using confocal microscopy setup with independent excitation collection objectives. observed regenerated PL emission at distances as far 50 micrometers away photoexcitation. then made scratch film to increase out-scattering found that peak internal photon spectrum red-shifts 765 ≥800 nanometers. This is caused by sharp decay absorption coefficient...