A5077275227- Catalytic Processes in Materials Science
- Catalysis and Hydrodesulfurization Studies
- Electrocatalysts for Energy Conversion
- Quantum Dots Synthesis And Properties
- Nanomaterials for catalytic reactions
- Catalysis and Oxidation Reactions
- Chalcogenide Semiconductor Thin Films
- Gold and Silver Nanoparticles Synthesis and Applications
- Catalysis for Biomass Conversion
- Copper-based nanomaterials and applications
- Zeolite Catalysis and Synthesis
- Catalysts for Methane Reforming
- Thermochemical Biomass Conversion Processes
- Nanocluster Synthesis and Applications
- Electron and X-Ray Spectroscopy Techniques
- Machine Learning in Materials Science
- Advanced Electron Microscopy Techniques and Applications
- Innovative Microfluidic and Catalytic Techniques Innovation
- Carbon dioxide utilization in catalysis
- Advanced Thermoelectric Materials and Devices
- CO2 Reduction Techniques and Catalysts
- solar cell performance optimization
- Advancements in Battery Materials
- Silicon and Solar Cell Technologies
- Ammonia Synthesis and Nitrogen Reduction
National Renewable Energy Laboratory
2016-2025
Oak Ridge National Laboratory
2022
University of California, Berkeley
2006-2011
Lawrence Berkeley National Laboratory
2006-2011
Foundry (United Kingdom)
2009
Molecular Foundry
2009
Yonsei University
2008
MacDiarmid Institute for Advanced Materials and Nanotechnology
2008
Massey University
2008
Peking University
2007-2008
Abstract Colloidal metal nanoparticles are emerging as key materials for catalysis, plasmonics, sensing, and spectroscopy. Within these applications, control of nanoparticle shape lends increasing functionality selectivity. Shape‐controlled nanocrystals possess well‐defined surfaces morphologies because their nucleation growth controlled at the atomic level. An overall picture shaped particles is presented, with a particular focus on solution‐based syntheses noble metals. General strategies...
Activity revived: Platinum nanoparticles (cuboctahedra, cubes, and porous particles, see picture, from left to right) capped with alkylammonium ions are synthesized by manipulating the reduction kinetics. The catalytic activity of these is superior that whose shape was controlled a polymeric capping agent foreign metal ions. Supporting information for this article available on WWW under http://www.wiley-vch.de/contents/jc_2002/2006/z603068_s.pdf or author. Please note: publisher not...
The vibrational spectra of platinum nanoparticles (2.4-9 nm) capped with poly(N-vinylpyrrolidone) (PVP) were investigated by deep UV-Raman and FTIR spectroscopy compared those pure PVP. Raman PVP/Pt show selective enhancement C=O, C-N, CH2 modes attributed to the pyrrolidone ring. Selective ring vibrations is both resonance effect SERS chemical enhancement. A red shift PVP carbonyl frequency on order 60 cm-1 indicates formation strong >C=O-Pt bonds. It concluded that adheres through a...
Binary Pt/Pd nanoparticles were synthesized by localized overgrowth of Pd on cubic Pt seeds for the investigation electrocatalytic formic acid oxidation. The binary particles exhibited much less self-poisoning and a lower activation energy relative to nanocubes, consistent with single crystal study.
Here, we demonstrate an approach for the selective growth of Pt, PtNi, and PtCo on CdS nanorods. The hybrid nanostructures prepared via organometallic synthesis have promise photocatalytic magnetic applications.
Single-site copper-based catalysts have shown remarkable activity and selectivity for a variety of reactions. However, deactivation by sintering in high-temperature reducing environments remains challenge often limits their use due to irreversible structural changes the catalyst. Here, we report zeolite-based copper which oxide agglomerates formed after reaction can be repeatedly redispersed back single sites using an oxidative treatment air at 550 °C. Under different environments,...
Monodisperse rhodium (Rh) and platinum (Pt) nanoparticles as small ∼1 nm were synthesized within a fourth generation polyaminoamide (PAMAM) dendrimer, hyperbranched polymer, in aqueous solution immobilized by depositing onto high-surface-area SBA-15 mesoporous support. X-ray photoelectron spectroscopy indicated that the as-synthesized Rh Pt mostly oxidized. Catalytic activity of supported was studied with ethylene hydrogenation at 273 293 K 10 torr 100 H2 after reduction (76 mixed 690 He)...
Monodisperse sub-10 nm Rh nanocubes were synthesized with high selectivity (>85%) by a seedless polyol method. The {100} faces of the NCs effectively stabilized chemically adsorbed Br- ions from trimethyl(tetradecyl)ammonium bromide (TTAB). This simple one-step route can be readily applied to preparation Pt and Pd nanocubes. Moreover, organic molecules PVP TTAB that encapsulated did not prevent catalytic activity for pyrrole hydrogenation CO oxidation.
Wiederbelebte Aktivität: Platinnanopartikel (Kuboktaeder, Würfel und poröse Partikel, im Bild von links nach rechts) mit Alkylammoniumionen als Bedeckung sind durch Manipulation der Reduktionskinetik zugänglich. Diese Nanopartikel katalytisch aktiver Nanopartikel, deren Form mithilfe Polymeren anderen Metallionen gesteuert wurde. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2001/2006/z603068_s.pdf or from author. Please note: The...
In situ APPES technique demonstrates that the strong metal support interaction effect (SMSI) in Ni-ceria system is associated with decoration and burial of metallic particles by partially reduced support, a phenomenon reversible evacuation at high temperature previously absorbed hydrogen.
Size-tunable monodisperse Rh nanocrystals can offer unique properties for many heterogeneous catalytic reactions (such as hydrogenation, hydroformylation, and hydrocarbonylation) of both scientific technological interest. In this article, we report the synthesis monodisperse, well-shaped in a range 5−15 nm by one-step polyol reduction at temperatures 170−230 °C under Ar, using rhodium(III) acetylacetonate [Rh(acac)3] source metal ions, 1,4-butanediol reducing solvent, poly(vinylpyrrolidone)...
Transition metal carbides (TMCs) have demonstrated outstanding potential for utilization in a wide range of catalytic applications because their inherent multifunctionality and tunable composition. However, the harsh conditions required to prepare these materials limited scope synthetic control over physical properties. The development low-temperature, carburization-free routes TMCs would unlock versatility this class materials, enhance our understanding properties, enable cost-effective...
The size-tunable synthesis of poly(vinylpyrrolidone)-stabilized cuboctahedral rhodium nanoparticles with mean diameters ranging between 3-7 nm and multipod structures was accomplished using seeded growth methods. Isotropic PVP-capped 2.9 seeds were prepared by ligand exchange on rhodium-triphenylphosphine metal-organic clusters. Quantitative investigation reaction parameters in ethylene glycol revealed that size shape could be controlled at a single temperature 120 degrees C. rate monomer...
Metal phosphides have been identified as a promising class of materials for the catalytic upgrading bio-oils, which are renewable and potentially inexpensive sources liquid fuels. Herein, we report facile synthesis series solid, phase-pure metal phosphide nanoparticles (NPs) (Ni2P, Rh2P, Pd3P) utilizing commercially available, air-stable metal–phosphine complexes in one-pot reaction. This single-source molecular precursor route provides an alternative method to access NPs with controlled...
Transition-metal phosphides (TMPs) are versatile materials with tunable electronic and structural properties that have led to exceptional catalytic performances for important energy applications. Identifying predictive relationships between the performance key features such as composition, morphology, crystalline structure hinges on ability independently tune these variables within a TMP system. Here, we developed versatile, low-temperature solution synthesis route alloyed nickel phosphide...
The hydrogenation of CO
In response to the rapid development and emerging commercialization of nanoparticles, fundamental studies concerning fate nanoparticles in environment are needed. Precise control over nanoparticle size, shape, surface coating cadmium selenide particles modified with thiolate ligands has been used analyze effects design on their stability aqueous environments. Nanoparticle was quantified using concept critical coagulation concentration (CCC) solutions sodium chloride. These investigations...
The translation of batch chemistries to high-throughput flow methods addresses scaling concerns associated with the implementation colloidal nanoparticle (NP) catalysts for industrial processes. A literature procedure synthesis Ni-NPs was adapted a continuous millifluidic (mF) method, achieving yields >60%. Conversely, NPs prepared in (B) reaction under conditions analogous gave only 45% yield. Both mF- and B-Ni-NP were supported on SiO2 compared Ni/SiO2 catalyst by traditional incipient...
Ethanol is a promising platform molecule for production of variety fuels and chemicals. Of particular interest the middle distillate (i.e., jet diesel blendstock) from renewable ethanol feedstock. State-of-the-art alcohol-to-jet technology requires multiple process steps based on catalytic dehydration to ethylene, followed by multistep oligomerization including n-butene formation then hydrotreatment distillation. Here we report that, over Ag-ZrO2/SBA-16 with balanced metal Lewis acid sites,...