A5039759620- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- Electrochemical Analysis and Applications
- Catalysis and Oxidation Reactions
- Catalysis and Hydrodesulfurization Studies
- Molecular Junctions and Nanostructures
- Fuel Cells and Related Materials
- Analytical Chemistry and Sensors
- CO2 Reduction Techniques and Catalysts
- Hydrocarbon exploration and reservoir analysis
- Machine Learning in Materials Science
- Catalysts for Methane Reforming
- Nanomaterials for catalytic reactions
- Spectroscopy and Quantum Chemical Studies
- Ammonia Synthesis and Nitrogen Reduction
- Spectroscopy and Chemometric Analyses
- X-ray Spectroscopy and Fluorescence Analysis
- Supercapacitor Materials and Fabrication
- Carbon Nanotubes in Composites
- Electrochemical sensors and biosensors
- Electron and X-Ray Spectroscopy Techniques
- X-ray Diffraction in Crystallography
- Advanced battery technologies research
- Enzyme Structure and Function
- Advancements in Battery Materials
Columbia University
2015-2024
Brookhaven National Laboratory
2006-2024
University of Delaware
2006-2014
Center for Innovation
2013
Yale University
2009
University of Kentucky
2008
Instituto Venezolano de Investigaciones Científicas
2008
Yeshiva University
2004-2007
Center for Functional Nanomaterials
2007
Albert Einstein College of Medicine
2000-2006
Not noble but effective: A new class of heterogeneous hydrogen-evolving electrocatalysts based on inexpensive components was developed. The carbon-supported nickel–molybdenum nitride (NiMoNx, see picture) catalyst had a nanoscale sheet structure comprising few layers and an abundance highly accessible reactive sites.
In an attempt to tailor low-cost, precious-metal-free electrocatalysts for water electrolysis in acid, molybdenum carbide (β-Mo2C) nanoparticles are prepared by situ carburization of ammonium molybdate on carbon nanotubes and XC-72R black without using any gaseous source. The formation Mo2C is investigated thermogravimetry X-ray diffraction. absorption analysis reveals that inlaid or anchored into the supports, electronic modification makes surface exhibit a relatively moderate Mo–H bond...
5-(Hydroxymethyl)furfural (HMF) and levulinic acid production from glucose in a cascade of reactions using Lewis (CrCl3) catalyst together with Brønsted (HCl) aqueous media is investigated. It shown that CrCl3 an active isomerization to fructose, the combined catalysts perform dehydration/rehydration reactions. A speciation model conjunction kinetics results indicates hydrolyzed Cr(III) complex [Cr(H2O)5OH](2+) most Cr species probably acts as acid-Brønsted base bifunctional site. Extended...
The electrochemical carbon dioxide reduction reaction to syngas with controlled CO/H2 ratios has been studied on Pd-based bimetallic hydrides using a combination of in situ characterization and density functional theory calculations. When compared pure Pd hydride, the hydride formation occurs at more negative potentials for Pd-Ag, Pd-Cu, Pd-Ni. Theoretical calculations show that choice second metal significant effect adsorption strength *H than *HOCO, free energies between these two key...
The development of Pt-based catalysts for use in fuel cells that meet performance targets high activity, maximized stability, and low cost remains a huge challenge. Herein, we report nitrogen (N)-doped high-entropy alloy (HEA) electrocatalyst consists Pt-rich shell N-doped PtCoFeNiCu core on carbon support (denoted as N-Pt/HEA/C). N-Pt/HEA/C catalyst showed mass activity 1.34 A mg
Splitting the C-C bond is main obstacle to electrooxidation of ethanol (EOR) CO(2). We recently demonstrated that ternary PtRhSnO(2) electrocatalyst can accomplish reaction at room temperature with Rh having a unique capability split bond. In this article, we report finding Ir be induced as component catalyst. characterized and compared properties several carbon-supported nanoparticle (NP) electrocatalysts comprising SnO(2) NP core decorated multimetallic nanoislands (MM' = PtIr, PtRh, IrRh,...
Bimetallic nanostructures with non-random metal atoms distribution are very important for various applications. To synthesize such structures via benign wet chemistry approach remains challenging. This paper reports a synthesis of Au/Pd alloy nanostructure through the galvanic replacement reaction between Pd ultrathin nanowires (2.4 ± 0.2 nm in width, over 30 length) and AuCl3 toluene. Both morphological structural changes were monitored during up to 10 h. Continuous chemical composition...
A detailed understanding of oxidation/dissolution mechanisms Pt is critical in designing durable catalysts for the oxygen reduction reaction (ORR), but exact remain unclear. The present work explores and monolayer (ML) electrocatalysts over a wide range applied potentials using cells that facilitate situ measurements by combining X-ray absorption spectroscopy (XAS) diffraction (XRD) measurements. near edge structure (XANES) measurement demonstrated nanoparticle surfaces were oxidized from...
Nicht edel, aber dennoch effektiv: Eine neue Klasse heterogener Elektrokatalysatoren, die aus kostengünstigen Komponenten bestehen, wurde zur Erzeugung von Wasserstoff entwickelt. Der auf Kohlenstoff immobilisierte Nickel-Molybdän-Katalysator, NiMoNx (siehe Bild), weist eine nanoskopische Schichtstruktur mit leichtem Zugang zu den reaktiven Zentren auf. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not...
Fe–K/Al<sub>2</sub>O<sub>3</sub>is shown to be an effective RWGS catalyst with high CO selectivity.
Ruthenium (Ru) is the one of most promising catalysts for polyolefin hydrogenolysis. Its performance varies widely with support, but reasons remain unknown. Here, we introduce a simple synthetic strategy (using ammonia as modulator) to tune metal-support interactions and apply it Ru deposited on titania (TiO2). We demonstrate that combining deuterium nuclear magnetic resonance spectroscopy temperature variation density functional theory can reveal complex nature, binding strength, H amount....
Abstract Rational catalyst design is crucial toward achieving more energy-efficient and sustainable catalytic processes. Understanding modeling reaction pathways kinetics require atomic level knowledge of the active sites. These structures often change dynamically during reactions are difficult to decipher. A prototypical example hydrogen-deuterium exchange catalyzed by dilute Pd-in-Au alloy nanoparticles. From a combination activity measurements, machine learning-enabled spectroscopic...
Electroreduction of carbon dioxide (CO2) or monoxide (CO) toward C2+ hydrocarbons such as ethylene, ethanol, acetate and propanol represents a promising approach carbon-negative electrosynthesis chemicals. Fundamental understanding the carbon─carbon (C-C) coupling mechanisms in these electrocatalytic processes is key to design development electrochemical systems at high energy conversion efficiencies. Here, we report investigation CO electreduction on single-atom copper (Cu)...
Efficient C–C bond cleavage and oxidation of alcohols to CO2 is the key developing highly efficient alcohol fuel cells for renewable energy applications. In this work, we report synthesis core/shell Au/Pt nanowires (NWs) with stepped Pt clusters deposited along ultrathin (2.3 nm) Au NWs as an active catalyst effectively oxidize CO2. The catalytic reaction dependent on ratios, Au1.0/Pt0.2 have largest percentage (∼75%) sites show highest activity ethanol electro-oxidation, reaching...
Hydrogenolysis of plastic waste using Ru-based catalysts is promising for deconstructing polyolefins into lower molecular weight products. Yet, the effect catalyst atomic structure and size on activity product selectivity poorly understood. Herein, we expose metal particle isotactic-polypropylene (i-PP) hydrogenolysis over Ru supported carbon. Despite similar distributions solid liquid products, their physical properties are distinct due to different chain regio-irregular CH3 sequences...