A5064875972- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Extraction and Separation Processes
- Semiconductor materials and devices
- Semiconductor materials and interfaces
- Electron and X-Ray Spectroscopy Techniques
- Graphene research and applications
- Advanced battery technologies research
- Gas Sensing Nanomaterials and Sensors
- Integrated Circuits and Semiconductor Failure Analysis
- Fuel Cells and Related Materials
- Advanced Sensor and Energy Harvesting Materials
- Advanced Photocatalysis Techniques
- Polymer Nanocomposites and Properties
- Carbon Nanotubes in Composites
- Conducting polymers and applications
- Neuroscience and Neural Engineering
- ZnO doping and properties
- MXene and MAX Phase Materials
- Advancements in Semiconductor Devices and Circuit Design
- Recycling and Waste Management Techniques
- Transition Metal Oxide Nanomaterials
- Advancements in Photolithography Techniques
Argonne National Laboratory
2018-2025
Universidade Federal de Minas Gerais
2010-2023
Alex's Lemonade Stand Foundation
2020
University of Illinois Urbana-Champaign
2020
Rice University
2013-2019
Photocatalysis is the most promising method for achieving artificial photosynthesis, but a bottleneck encountered in finding materials that could efficiently promote water splitting reaction. The nontoxicity, low cost, and versatility of photocatalysts make them especially attractive this application. This study demonstrates small amounts α‐Fe 2 O 3 nanosheets can actively exfoliation g‐C N 4 , producing 2D hybrid exhibits tight interfaces an all‐solid‐state Z‐scheme junction. These...
3D CoNi 2 S 4 ‐graphene‐2D‐MoSe (CoNi ‐G‐MoSe ) nanocomposite is designed and prepared using a facile ultrasonication hydrothermal method for supercapacitor (SC) applications. Because of the novel structures resultant maximized synergistic effect among ultrathin MoSe nanosheets, highly conductive graphene nanoparticles, electrode exhibits rapid electron ion transport rate large electroactive surface area, resulting in its amazing electrochemical properties. The demonstrates maximum specific...
Batteries for high temperature applications capable of withstanding over 60 °C are still dominated by primary cells. Conventional rechargeable energy storage technologies which have exceptional performance at ambient temperatures employ volatile electrolytes and soft separators, resulting in catastrophic failure under heat. A composite electrolyte/separator is reported that holds the key to extend capability Li‐ion batteries temperatures. stoichiometric mixture hexagonal boron nitride,...
The structural modification of nanomaterials at the atomic level has potential to generate tailor‐made components with enhanced performance for a variety tasks. chemical versatility graphene been constantly employed fabricate multi‐functional doped 2D materials applications encompassing energy storage and electrocatalysis. Despite many reports on boron‐ nitrogen‐doped graphenes, possible synergy that arises from combining these electronically complementary elements yet be fully understood...
The operating temperatures of current electrochemical energy storage devices are limited due to electrolyte degradation and separator instability at higher temperatures. Here we demonstrate that a tailored mixture materials can facilitate operation supercapacitors record temperatures, as high 200°C. Composite electrolyte/separator structures made from naturally occurring clay room temperature ionic liquids, with graphitic carbon electrodes, show stable supercapacitor performance 200°C good...
Many unique properties arise when the 3D stacking of layered materials is disrupted, originating nanostructures. Stabilization, and further reorganization these individual layers into complex structures, can be essential to allow persist in macroscopic systems. It demonstrated that a simple hydrothermal process, assisted by ionic liquids (ILs), convert bulk g‐C 3 N 4 stable hydrogel. The gelation occurs through delamination structure, driven particular interactions between IL carbon nitride...
Increasing the charge rate of Li-ion cells over 1–2C (full in 30–60 min) would be highly desirable, but high currents flowing through active materials push these to their endurance limits. In this article, we aim understand how such high-current regimes affect electrochemical properties cells. Formation Li metal deposits is a recognized hazard high-rate charging, as plating can overtake lithium intercalation negative electrode. Here demonstrate microprobe Li/Cu reference electrodes used...
The hydrogenation of CO2 into useful chemicals provides an industrial-scale pathway for recycling. lack effective thermochemical catalysts currently precludes this process, since it is challenging to identify structures that can simultaneously exhibit high activity and selectivity reaction. Here, we report, the first time, use nitrogen-doped graphene quantum dots (NGQDs) as metal-free hydrogenation. nitrogen dopants, located at edge sites, play a key role in inducing thermocatalytic carbon...
With its exceptional theoretical charge capacity, silicon holds great promise as an anode material for realization of high energy density Li‐ion batteries. However, extensive volume expansion and poor cycle stability compromise actual use. In effort to tame structural disintegration during cycling, innovative 3D electrode assembly is fabricated involving continuous layer graphene coated on porous current collector Si nanoparticles sealed in active material. Graphene deposition pore formation...
The severe volumetric changes in Si particles during the Li (de)alloying process cause expansion and contraction of electrodes, which along with excessive electrolyte reduction solid interphase formation brings about rapid decay cell capacity. In this work, we use operando electrochemical dilatometry to quantify (de)lithiation-induced expansion/contraction Si-based graphite-rich electrodes cycling. We evaluate relationship between electrode capacity dilation observe that by increasing...
Fast-charge protocols that prevent lithium plating are needed to extend the life span of lithium-ion batteries. Here, we describe a simple experimental method estimate minimum charging time below which it is simply impossible avoid at given temperature. We demonstrate that, by gauging and correcting ohmic drop intrinsic reference electrodes, local potential anode surface can be reasonably approximated. This finer control enables determination maximum average rate deposition mitigated,...
Rechargeable batteries capable of operating at high temperatures have significant use in various targeted applications. Expanding the thermal stability current lithium ion requires replacing electrolyte and separators with stable alternatives. Since solid-state electrolytes do not a good electrode interface, we report here development new class quasi-solid-state electrolytes, which structural solid wettability liquid. Microflakes clay particles drenched solution lithiated room temperature...
Fabrication of lithium-ion batteries that operate from room temperature to elevated temperatures entails development and subsequent identification electrolytes electrodes. Room ionic liquids (RTILs) can address the thermal stability issues, but their poor conductivity at compatibility with traditional graphite anodes limit practical application. To these challenges, we evaluated novel high energy density three-dimensional nano-silicon electrodes paired 1-methyl-1-propylpiperidinium...
The scalable fabrication of 3D macroscopic solids with controllable densities nanoscale junctions between carbon nanotubes (CNTs) is reported using chemical vapor deposition. nanoscale intermolecular result in porous high thermal stability, electrical conductivity, excellent mechanical properties, and structural stability concentrated acids, bases, organic solvents. Such CNT represent the next generation carbon-based materials potential for a broad range applications. As service to our...
Nickel-rich Ni-Co-Mn (NCM) or Ni-Co-Al (NCA) layered-oxide positive electrodes (cathodes) allow high-voltage operation of lithium-ion cells with increased energy density, but their long-term cycling causes gradual increase in impedance that slows down lithiation and delithiation the material. Here we report pairing these cathodes lithium titanate (Li4Ti5O12, LTO) negative (anodes) accelerates this rise when compared to graphite (Gr) electrodes, during potentiostatic holds (calendar-aging) at...