A5049423398- Graphene research and applications
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- 2D Materials and Applications
- Semiconductor materials and interfaces
- Machine Learning in Materials Science
- MXene and MAX Phase Materials
- Boron and Carbon Nanomaterials Research
- Chalcogenide Semiconductor Thin Films
- Advanced Battery Technologies Research
- Metal and Thin Film Mechanics
- Nanopore and Nanochannel Transport Studies
- Fuel Cells and Related Materials
- Microstructure and mechanical properties
- Graphene and Nanomaterials Applications
- Advanced Materials and Mechanics
- Diamond and Carbon-based Materials Research
- Recycling and Waste Management Techniques
- Aluminum Alloys Composites Properties
- Carbon Nanotubes in Composites
- Advanced Photonic Communication Systems
- Extraction and Separation Processes
- Optical Network Technologies
- Electron and X-Ray Spectroscopy Techniques
New Jersey Institute of Technology
2017-2024
Newark Hospital
2018-2021
John Brown University
2012-2020
Stanford University
1993-2018
University of Chittagong
2018
Government of India
2017
Bhabha Atomic Research Centre
2017
Brown University
2010-2015
University of Pennsylvania
2014
Jadavpur University
2009
Because of their abundance, sodium and calcium can be attractive in ion batteries for large-scale grid storage. However, many the anode materials being pursued have limitations including volume expansion, lack passivating films, slow kinetics. Here, we investigate adsorption Na Ca on graphene with divacancy Stone–Wales defects graphene. Our results show that although is not possible pristine graphene, enhanced observed defective because increased charge transfer between adatoms defects. We...
Water microdroplets containing graphene oxide and a second solute are shown to spontaneously segregate into sack-cargo nanostructures upon drying. Analytical modeling molecular dynamics suggest the sacks form when slow-diffusing preferentially accumulates adsorbs at receding air–water interface, followed by capillary collapse. Cargo-filled nanosacks can be nanomanufactured simple, continuous, scalable process promising for many applications where nanoscale materials should isolated from...
Many environmental technologies rely on containment by engineered barriers that inhibit the release or transport of toxicants. Graphene is a new, atomically thin, two-dimensional sheet material, whose aspect ratio, chemical resistance, flexibility, and impermeability make it promising candidate for inclusion in next generation barriers. Here we show ultrathin graphene oxide (GO) films can serve as effective both liquid vapor permeants. First, GO deposition porous substrates shown to block...
Silicon is a high-capacity anode material for lithium-ion batteries. Electrochemical cycling of Si electrodes usually produces amorphous LixSi (a-LixSi) alloys at room temperature. Despite intensive investigation the electrochemical behaviors a-LixSi alloys, their mechanical properties and underlying atomistic mechanisms remain largely unexplored. Here we perform molecular dynamics simulations to characterize with newly developed reactive force field (ReaxFF). We compute yield fracture...
Abstract The development of next-generation batteries, utilizing electrodes with high capacities and power densities requires a comprehensive understanding precise control material interfaces architectures. Electro-chemo-mechanics plays an integral role in the morphological evolution stability such complex interfaces. Volume changes electrode materials chemical interactions electrode/electrolyte result nonuniform stress fields structurally different interphases, fundamentally affecting...
High specific capacity anode materials such as silicon (Si) are increasingly being explored for next-generation, high performance lithium (Li)-ion batteries. In this context, Si films advantageous compared to nanoparticle based anodes since in the free volume between nanoparticles is eliminated, resulting very volumetric energy density. However, undergoes expansion (contraction) under lithiation (delithiation) of up 300%. This large leads stress build-up at interface film and current...
In lithium-ion batteries, the electrochemical reaction between Li and Si causes structural changes in negative electrode. The dynamics of lithiation can be further complicated by crystalline-to-amorphous phase transition. situ TEM experiments show that a sharp interface, known as boundary, is formed c-Si a-LixSi during initial lithiation. Despite intensive study mixing mechanism electrode, atomistic investigation formation propagation boundary for different orientation remains unclear. We,...
At present, the most common type of cathode materials, NCA (Li1-xNi0.80Co0.15Al0.05O2, x = 0 to 1), have a very high concentration cobalt. Since cobalt is toxic and expensive, existing design materials neither cost-effective nor environmentally benign. We performed density functional theory (DFT) calculations investigate electrochemical, electronic, structural properties four types with simultaneous decrease in Co content along increase Ni content. Our results show that even if significantly...
Understanding the solvation structure of electrolytes is crucial for optimizing performance and stability lithium-ion batteries. Novel solvents are essential enhancing electrolyte ensuring better integration with modern electrode systems. However, there limited studies focused on fluorinated solvent-based electrolytes. Herein, we report a new weakly solvated ether (WSEE) composed pure solvent, which results in an anion-rich even at low salt concentration 1M. To explore this, selected...
Abstract Transition Metal Dichalcogenides (TMDs) are one of the most studied two-dimensional materials in last 5–10 years due to their extremely interesting layer dependent properties. Despite presence vast research work on TMDs, complex relation between electro-chemical and physical properties make them subject further research. Our main objective is provide a better insight into electronic structure TMDs. This will help us understand stability bilayer post growth homo/hetero products based...
Among intercalation, alloying, and conversion battery chemistries, the intercalation chemistry is most widely used in commercial applications due to its superior reversibility, round trip efficiency, stability, albeit at expense of reduced specific capacity. While hosts for monovalent ions (e.g., lithium sodium) are well developed, jury still out on best available host materials multivalent such as magnesium, zinc, calcium, aluminum. In systems, it challenging find electrode that can act a...
We describe the spontaneous wrinkling, saddling, and wedging of metallic, annular bilayer nanostructures driven by grain coalescence in one layers. Experiments revealed these different outcomes based on dimensions annuli, we find that essential features are captured using finite element simulations plastic deformation metal bilayers. Our results show nanomechanics associated with planar can be important forming complex three-dimensional nanostructures.