Abstract The ablation yield and bubble‐formation process during nanosecond pulsed‐laser of silver in water are analysed by stroboscopic videography, time‐resolved X‐ray radiography situ UV/Vis spectroscopy. This is studied as function lens–target distance laser fluence. Both the bubble‐cavitation exhibit threshold behaviour a fluence, which linked to efficiency coupling energy at water/target interface. Although happens below this threshold, quantitative material emission bubble formation....

Laser-induced cavitation has mostly been studied in bulk liquid or at a two-dimensional wall, although target shapes for the particle synthesis may strongly affect bubble dynamics and interfere with productivity. We investigated of induced by pulsed-laser ablation different geometries high-speed laser microsecond videography focus on collapse behaviour. This method enables us observations high time resolution (intervals 1 μs) single-pulse experiments. Further, we analyzed nanoparticle...

High-power, nanosecond, pulsed-laser ablation in liquids enables the continuous synthesis of highly pure colloidal nanoparticles (NPs) at an application-relevant scale. The gained mass-weighted particle size distribution is however often reported to be broad, requiring post treatment like centrifugation remove undesired fractions. To date, available techniques are generally discontinuous, limiting throughput and hindering economic upscaling. Hence, throughout this paper, a scalable,...

PtPd catalysts are state-of-the-art for automotive diesel exhaust gas treatment. Although wet-chemical preparation of nanoparticles below 3 nm and kg-scale synthesis supported PtPd/Al2O3 already established, the partial segregation bimetallic remains an issue that adversely affects catalytic performance. As a promising alternative, laser-based catalyst allows continuous surfactant-free, solid-solution alloy at g/h-scale. However, required productivity catalytically relevant size fraction...

Catalyst layers (CL), as an active component of the catalyst coated membrane (CCM), form heart polymer electrolyte fuel cell (PEMFC). For optimum performance cell, obtaining suitable structural and functional characteristics for CL is crucial. Direct tuning microstructure morphology non-trivial; hence inks precursors need to be modulated, which are then applied onto a CCM. Obtaining favorable dispersion forms important prerequisite in engineering large scale manufacturing. In order...

In this paper, emission spectroscopy and fast imaging surveys during pulsed laser ablation in liquid (PLAL) for nanoparticles (NPs) production have been used, order to provide further details about the process involved potentialities offered by a wire-shaped sample ablated flowing water jet. This kind of set-up has explored because efficiency increases when thin layer target are used. understand physical processes causing increasing efficiency, both laser-induced plasma bubble dynamics...

For exerting potential catalytic and photocatalytic activities of metal nanoparticles (MNPs), immobilization MNPs on a support medium in highly dispersed state is desired. In this Research Article, we demonstrated that surfactant-free platinum (PtNPs) were efficiently immobilized graphene oxide (GO) nanosheets by utilizing oligopeptide β-sheets as cross-linker. The fluorenyl-substituted peptides designed to form β-sheets, where metal-binding thiol groups protonated positively charged amino...

Abstract It is well established that the activity of photocatalysts can be improved by deposition redox catalysts, which effectively extract photogenerated charge carriers, enhance rate interfacial reactions, and thus suppress undesired recombination processes. For optimum performance, a high degree control over loading, size, surface catalytic properties catalyst particles desirable. Herein, novel, highly controllable, versatile method for preparation TiO 2 composites reported. starts with...

Catalytic activity and toxicity of mixed-metal nanoparticles have been shown to correlate are known be dependent on surface composition. The chemistry the fully inorganic, ligand-free silver-gold alloy nanoparticle molar fraction series, is highly interesting for applications in heterogeneous catalysis, which determined by active sites also relevant understanding their dissolution behavior biomedically-relevant ion-release scenarios. However, such information has never systematically...

This study involves the preparation and catalytic properties of anatase titanium dioxide nanofibers (TiO2 NFs) supported gold nanoparticles (Au NPs) using a model reaction based on reduction 4‐nitrophenol (NP) into 4‐aminophenol (AP) by sodium borohydride (NaBH4). The fabrication surfactant‐free Au NPs was performed pulsed laser ablation in liquid (PLAL) technique. TiO2 NFs were fabricated combination electrospinning calcination process solution containing poly(vinyl pyrolidone)(PVP)...

Catalyst layers (CL), as an active component of the catalyst coated membrane (CCM), form heart proton electrolyte fuel cell (PEMFC). For optimum performance cell, obtaining suitable structural and functional characteristics for CL is crucial. Direct tuning microstructure morphology non-trivial; hence inks precursors need to be modulated, which are then applied onto a CCM. Obtaining favorable dispersion forms important prerequisite in engineering large scale manufacturing. In order facilitate...

This study introduces a comprehensive multi-scale framework for analyzing and optimizing the microstructural properties of catalyst-coated membranes (CCMs) in polymer electrolyte membrane fuel cells (PEMFCs). The approach integrates mercury intrusion porosimetry (MIP), multiple microscopy techniques, non-destructive focused ion beam scanning electron (FIB-SEM), enabling detailed characterization across scales, from tens nanometers to hundreds micrometers. A custom MATLAB-based...

Solvent-based processing is the most favored method for fabrication of electrocatalyst layers proton exchange membrane fuel cells. In this process, catalyst supported on carbon and stabilized by an ionomer dispersed in a continuous solvent medium, forming ink. Although importance ink has been realized, it still governed empiricism. To end, we systematically investigated effects colloidal stability electrochemical performance electrode assemblies (MEAs). Analytical centrifugation electron...

Catalyst layers (CL), as an active component of the catalyst coated membrane (CCM), form heart proton electrolyte fuel cell (PEMFC). For optimum performance cell, obtaining suitable structural and functional characteristics for CL is crucial. Direct tuning microstructure morphology non-trivial; hence inks precursors need to be modulated, which are then applied onto a CCM. Obtaining favorable dispersion forms important prerequisite in engineering large scale manufacturing. In order facilitate...

Palladium (Pd) nanoparticles have been investigated for the hydrogen evolution reaction, oxidation oxygen reduction and methanol ethanol reaction. The high methanol/ethanol tolerance of Pd is noteworthy. A powerful approach to further improving catalytic properties through alloying with suitable co-metals. In case reaction in alkaline media, alloyed Au has demonstrated excellent activity exceeding even that highly active Pt catalysts (1). complete miscibility, small lattice mismatch,...

One major hurdle in the development of efficient electrocatalysts is deterioration activity, which can be caused by selective dissolution metals [1]. The recent gold-palladium (Au-Pd) alloy nanoparticles outlines a contemporary strategy to impart increased stability combining more electrochemically stable metal such as Au with lesser Pd [2, 3]. Unfortunately, relative surface-reactivity poor, and result, there an inevitable design constraint form Pd-rich outer shell structure - task that...

One of the main cost and durability controlling components proton exchange membrane fuel cells (PEMFCs) is cathode catalyst layer where oxygen reduction takes place [1]. While underlying electrochemical mechanisms are currently intensely explored on fundamental level [2], [3], ink formulation, which most critical step in PEMFC processing still optimized empirically. As a result, poor formulations with less stable materials show low performance lab-scale, hampering their commercialization....