A5046838323- Advancements in Battery Materials
- Catalytic Processes in Materials Science
- Electrocatalysts for Energy Conversion
- Advanced Battery Materials and Technologies
- Electron and X-Ray Spectroscopy Techniques
- Nanomaterials for catalytic reactions
- Advanced Electron Microscopy Techniques and Applications
- Electronic and Structural Properties of Oxides
- Catalysis and Oxidation Reactions
- Fuel Cells and Related Materials
- Advanced battery technologies research
- Magnetic and transport properties of perovskites and related materials
- Advanced Battery Technologies Research
- Semiconductor materials and devices
- Advanced Photocatalysis Techniques
- 2D Materials and Applications
- Copper-based nanomaterials and applications
- Extraction and Separation Processes
- Nanocluster Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Graphene research and applications
- Machine Learning in Materials Science
- Gold and Silver Nanoparticles Synthesis and Applications
- Ferroelectric and Piezoelectric Materials
- nanoparticles nucleation surface interactions
Oak Ridge National Laboratory
2016-2025
Duke University
2024-2025
Center for Nanophase Materials Sciences
2014-2025
University of Tennessee at Knoxville
2024
University of Michigan–Ann Arbor
2024
Material Sciences (United States)
2023
Oak Ridge Associated Universities
2014-2021
University of Vienna
2021
Rice University
2021
Physical Sciences (United States)
2015
Giving Electrocatalysts an Edge Platinum (Pt) is excellent catalyst for the oxygen-reduction reaction (ORR) in fuel cells and electrolyzers, but it too expensive scarce widespread deployment, even when dispersed as Pt nanoparticles on carbon electrode supports (Pt/C). Alternatively, Chen et al. (p. 1339 , published online 27 February; see Perspective by Greer ) made highly active ORR catalysts dissolving away interior of rhombic dodecahedral PtNi 3 nanocrystals to leave Pt-rich Ni edges....
Skutterudites CoSb3 with multiple cofillers Ba, La, and Yb were synthesized very high thermoelectric figure of merit ZT = 1.7 at 850 K was realized. X-ray diffraction the densified multiple-filled bulk samples reveals all are phase pure. High-resolution scanning transmission electron microscopy (STEM) energy dispersive spectroscopy (EDS) analysis confirm that guest fillers occupy nanoscale-cages in skutterudites. The further shown to be uniformly distributed Co−Sb skutterudite framework is...
Etching platinum nanocage catalysts Although is an excellent catalyst for the oxygen reduction reaction that occurs in fuel cells, its scarcity continues to drive efforts improve utilization. Zhang et al. made nanocages of by coating palladium nanocrystals with only a few layers and then etching away core (see Perspective Strasser). Platinum using nanoscale octahedra cubes displayed different catalytic activity reaction. Science , this issue p. 412 ; see also 379
The Stardust spacecraft collected thousands of particles from comet 81P/Wild 2 and returned them to Earth for laboratory study. preliminary examination these samples shows that the nonvolatile portion is an unequilibrated assortment materials have both presolar solar system origin. contains abundance silicate grains are much larger than predictions interstellar grain models, many high-temperature minerals appear formed in inner regions nebula. Their presence a proves formation included...
High voltage cathode materials Li-excess layered oxide compounds Li[NixLi1/3−2x/3Mn2/3−x/3]O2 (0 < x 1/2) are investigated in a joint study combining both computational and experimental methods. The bulk surface structures of pristine cycled samples Li[Ni1/5Li1/5Mn3/5]O2 characterized by synchrotron X-Ray diffraction together with aberration corrected Scanning Transmission Electron Microscopy (a-S/TEM). Energy Loss Spectroscopy (EELS) is carried out to investigate the changes before/after...
A solid-state high-voltage (5 V) lithium battery is demonstrated to deliver a cycle life of 10 000 with 90% capacity retention. The solid electrolyte enables the use cathodes and Li anodes minimum side reactions, leading high Coulombic efficiency 99.98+%. As service our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized for online delivery, but not copy-edited or typeset. Technical support issues arising...
The bulk of the comet 81P/Wild 2 (hereafter Wild 2) samples returned to Earth by Stardust spacecraft appear be weakly constructed mixtures nanometer-scale grains, with occasional much larger (over 1 micrometer) ferromagnesian silicates, Fe-Ni sulfides, metal, and accessory phases. very wide range olivine low-Ca pyroxene compositions in requires a formation conditions, probably reflecting different locations protoplanetary disk. restricted compositional ranges for absence hydrous phases...
Advancement in heterogeneous catalysis relies on the capability of altering material structures at nanoscale, and that is particularly important for development highly active electrocatalysts with uncompromised durability. Here, we report design synthesis a Pt-bimetallic catalyst multilayered Pt-skin surface, which shows superior electrocatalytic performance oxygen reduction reaction (ORR). This novel structure was first established thin film extended surfaces tailored composition profiles...
Abstract Conformal deposition of platinum as ultrathin shells on facet-controlled palladium nanocrystals offers a great opportunity to enhance the catalytic performance while reducing its loading. Here we report such system based icosahedra. Owing lateral confinement imposed by twin boundaries and thus vertical relaxation only, overlayers evolve into corrugated structure under compressive strain. For core-shell with an average 2.7 overlayers, their specific mass activities towards oxygen...
We report a unique synthesis of core/shell Pd/FePt nanoparticles (NPs) and their catalysis the oxygen reduction reaction (ORR). The uniform FePt shell is formed by controlled nucleation Fe(CO)5 in presence Pt salt Pd NPs at designated temperatures. show shell-dependent catalytic properties, those having 1 nm exhibit drastic increase durability activity (15 times more active with 140 mV gain onset potential comparison 3 coating). These are promising new catalysts for practical fuel cell applications.
Mesoporous carbon with homogeneously dispersed multi-walled nanotubes (MWNTs) are synthesized via a one-step “brick and mortar” soft-templating approach. Nanocomposites exhibit reversible lithium storage capacity of 900 mA h g−1 good rate performance. Such homogeneous nanocomposites ideal candidates for electric vehicle applications where high power energy density primary requirements.
Abstract Owing to their attractive application potentials in both non-volatile memory and unconventional computing, memristive devices have drawn substantial research attention the last decade. However, major roadblocks still remain device performance, especially concerning relatively large parameter variability limited cycling endurance. The response of active region within between switching cycles plays dominating role, yet microscopic details elusive. This Review summarizes recent...
Despite their different chemistries, novel energy-storage systems, e.g., Li-air, Li-S, all-solid-state Li batteries, etc., face one critical challenge of forming a conductive and stable interface between metal solid electrolyte. An accurate understanding the formation mechanism exact structure chemistry rarely existing benign interfaces, such as Li-cubic-Li7-3xAlxLa3Zr2O12 (c-LLZO) interface, is crucial for enabling use anodes. Due to spatial confinement structural chemical complications,...
A TiNb<sub>2</sub>O<sub>7</sub> material with a nanoporous structure was prepared by facile approach and can be used as an anode excellent rate cycling performance for long-life stationary lithium-ion batteries.
Nicely decorated: A sandwich-structured photocatalyst shows an excellent performance in degradation reactions of a number organic compounds under UV, visible light, and direct sunlight (see picture). The catalyst was synthesized by combination nonmetal doping plasmonic metal decoration TiO2 nanocrystals, which improves visible-light activity enhances light harvesting charge separation, respectively. Detailed facts importance to specialist readers are published as ”Supporting Information”....
An SPR biosensor was developed by employing highly stable Au-protected Ag nanoplates (NP) as enhancers (see picture). Superior performance achieved depositing a thin and uniform coating of Au on the surface while minimizing disruptive galvanic replacement retaining strong plasmon resonance (SPR) silver nanoplates.
Abstract Nickel‐rich layered oxide cathodes with the composition LiNi 1− x − y Co Mn O 2 (NCM, (1− ) ≥ 0.6) are under intense scrutiny recently to contend commercial 0.8 0.15 Al 0.05 (NCA) for high‐energy‐density batteries electric vehicles. However, a comprehensive assessment of their electrochemical durability is currently lacking. Herein, two in‐house cathodes, and 0.7 , investigated in high‐voltage graphite full cell over 1500 charge‐discharge cycles (≈5–10 year service life vehicles)....
We report a facile synthesis of multiply twinned Pd@Pt core–shell concave decahedra by controlling the deposition Pt on preformed Pd decahedral seeds. The atoms are initially deposited vertices seed, followed surface diffusion to other regions along edges/ridges and then across faces. Different from coating icosahedral prefer stay at seed even when is conducted 200 °C, naturally generating structure covered facets. nonuniformity in can be attributed presence twin boundaries vertices, as well...
Nanowires of copper can be coated from liquids to create flexible, transparent conducting films that potentially replace the dominant conductor, indium tin oxide, in displays, solar cells, organic light-emitting diodes, and electrochromic windows. One issue with these nanowire is prone oxidation. It was hypothesized resistance oxidation could improved by coating nanowires nickel. This work demonstrates a method for synthesizing nickel shells as well properties cupronickel films. Time-...