Armin VahidMohammadi

Armin VahidMohammadi
Drexel University | DU · A.J. Drexel Nanotechnology Institute (DNI)

Ph.D.
Advancing Electrical Energy Storage

About

39
Publications
11,655
Reads
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1,946
Citations
Additional affiliations
September 2019 - June 2020
University of Connecticut
Position
  • PostDoc Position
Description
  • Independent Researcher
August 2015 - August 2019
Auburn University
Position
  • Research Assistant
Description
  • AL-NASA EPSCoR Fellow
August 2013 - August 2015
Florida International University
Position
  • Research Assistant

Publications

Publications (39)
Article
A decade after the first report, the family of two-dimensional (2D) carbides and nitrides (MXenes) includes structures with three, five, seven, or nine layers of atoms in an ordered or solid solution form. Dozens of MXene compositions have been produced, resulting in MXenes with mixed surface terminations. MXenes have shown useful and tunable elect...
Article
Rechargeable aluminum batteries (Al-batteries) can potentially be safer, cheaper, and deliver higher energy densities compared to commercial Li-ion batteries (LIBs). However, due to the very high charge density of Al³⁺ cations and their strong interaction with the host lattice, very few cathode materials are known to be able to reversibly intercala...
Article
Full-text available
Electrochemical capacitors (ECs) that store charge based on the pseudocapacitive mechanism combine high energy densities with high power densities and rate capabilities. 2D transition metal carbides (MXenes) have been recently introduced as high‐rate pseudocapacitive materials with ultrahigh areal and volumetric capacitances. So far, 20 different M...
Article
Label-free nanopore technology for sequencing biopolymers such as DNA and RNA could potentially replace existing methods if improvements in cost, speed, and accuracy are achieved. Solid-state nanopores have been developed over the past two decades as physically and chemically versatile sensors that mimic biological channels, through which transport...
Article
Full-text available
Gaining control over the nanoscale assembly of different electrode components in energy storage systems can open the door for design and fabrication of new electrode and device architectures that are not currently feasible. This work presents aqueous layer‐by‐layer (LbL) self‐assembly as a route towards design and fabrication of advanced lithium‐io...
Article
Full-text available
Synaptic devices with linear high‐speed switching can accelerate learning in artificial neural networks (ANNs) embodied in hardware. Conventional resistive memories however suffer from high write noise and asymmetric conductance tuning, preventing parallel programming of ANN arrays. Electrochemical random‐access memories (ECRAMs), where resistive s...
Article
Analog Resistive Memories In article number 2109970, Armantas Melianas, Armin VahidMohammadi, Alberto Salleo, Mahiar Max Hamedi, and co‐workers present the world's first electrochemical transistor memory based on 2D materials (MXene). These transistors can be used for neuromorphic computers, where they are a thousand times faster than previous ioni...
Article
Reversible electrochemical intercalation of cations into the interlayer space of 2D materials induces tunable physical and chemical properties in them. In MXenes, a large class of recently developed 2D carbides and nitrides, low intercalation energy, high storage capacitance, and reversible intercalation of various cations have led to their improve...
Article
Two-dimensional (2D) heterostructured electrodes built from vertical stacking of different 2D materials are among the most promising electrode architectures for electrochemical energy storage devices. These materials offer interesting opportunities such as versatility in the structural design of electrode, and the possibility to integrate individua...
Preprint
Full-text available
Synaptic devices with linear high-speed switching can accelerate learning in artificial neural networks (ANNs) embodied in hardware. Conventional resistive memories however suffer from high write noise and asymmetric conductance tuning, preventing parallel programming of ANN arrays as needed to surpass conventional computing efficiency. Electrochem...
Article
In article number 2006434, Zhen Wang, Mahiar Max Hamedi, and co‐workers demonstrate that layer‐by‐layer self‐assembly enables unprecedented precision in designing and controlling the nanoscale architecture of battery electrodes. The technique is a powerful route for fabricating high‐performance lithium‐ion batteries, and allows new form factors suc...
Article
Bottom-up assembly of two-dimensional (2D) materials into macroscale morphologies with emergent properties requires control of the material surroundings, so that energetically favorable conditions direct the assembly process. MXenes, a class of recently developed 2D materials, have found new applications in areas such as electrochemical energy stor...
Article
We here report a liquid-phase exfoliation strategy to delaminate multilayered biochars into multi-heteroatom (Fe, N, S) co-doped graphene-like carbon nanosheets, in which the multilayered biochars derived from naturally evolved layer-by-layer precursors. This strategy provides the versatile capability to tailor the textural properties of the as-syn...
Article
Full-text available
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Preprint
Full-text available
Bottom-up assembly of two-dimensional (2D) materials into macroscale morphologies with emergent properties requires control of the material surroundings, so that energetically favorable conditions direct the assembly process. MXenes, a class of recently developed 2D materials, have found new applications in areas such as electrochemical energy stor...
Article
Full-text available
Two-dimensional membranes have gained enormous interest due to their potential to deliver precision filtration of species with performance that can challenge current desalination membrane platforms. Molybdenum disulfide (MoS2) laminar membranes have recently demonstrated superior stability in aqueous environment to their extensively-studied analogs...
Article
The Front Cover shows the Legendary King Arthur pulling his magic sword Excalibur, an array of benzene molecules, out of the rock – which is a layered metal carbide (MXene) catalyst that reacts with methane molecules. As Excalibur has come to represent the noblest aspects of the Arthurian legend, Benzene has also come to represent a highly desired...
Article
Full-text available
Two-dimensional membranes have gained enormous interest due to their potential to deliver precision filtration of species with performance that can challenge current desalination membrane platforms. Molybdenum disulfide (MoS2) laminar membranes have recently demonstrated superior stability in aqueous environment to their extensively-studied analogs...
Article
Full-text available
Two-dimensional membranes have gained enormous interest due to their potential to deliver precision filtration of species with performance that can challenge current desalination membrane platforms. Molybdenum disulfide (MoS2) laminar membranes have recently demonstrated superior stability in aqueous environment to their extensively-studied analogs...
Article
We report the use of a multilayered vanadium carbide MXene (m-V2CTx) as a precursor for a robust oxy-carbide catalyst to convert CH4 and CO2 into syngas via dry reforming of methane (DRM). The in-situ generated V2O3-V8C7/m-V2CTx catalyst undergoes a redox (oxidation-carburization) mechanism that results in an attractive reactivity, selectivity (H2/...
Article
We report a thermally stable multilayered two‐dimensional vanadium carbide (V 2 CT x ) MXenes catalyst for the direct conversion of methane (CH 4 ) into benzene (C 6 H 6 ). The multilayered carbide structure shows state‐of‐the‐art CH 4 conversion 11.8% with a C 6 H 6 formation rate of 1.9 mmol g cat ‐1 h ‐1 (4.84% C 6 H 6 yield) at 700 0 C, which i...
Chapter
Similar to other two-dimensional (2D) materials, single-layer and few-layer MXene flakes have significantly different physiochemical properties compared to their multilayered counterparts. 2D MXene flakes offer high surface area to volume ratio, tunable functional surfaces, high electrical conductivity, and excellent mechanical properties. These pr...
Article
Full-text available
The family of two‐dimensional (2D) metal carbides and nitrides, known as MXenes, are among the most promising electrode materials for supercapacitors thanks to their high metal‐like electrical conductivity and surface‐functional‐group‐enabled pseudocapacitance. A major drawback of these materials is, however, the low mechanical strength, which prev...
Cover Page
Full-text available
In article number 1902977, Liangqi Ouyang, Mahiar M. Hamedi, and co‐workers report the fabrication of freestanding and multifunctional nanocomposite films of 2D Ti3C2Tx MXene and 1D cellulose nanofibrils (CNFs) with a high mechanical strength of 341 MPa and high conductivity of 295 S cm−1. These films, despite their high mechanical robustness, deli...
Article
The sensitive detection of explosive and flammable gases is an extremely important safety consideration in today's industry. Identification of trace amounts of nonpolar analytes at ambient temperatures, however, is still a challenge because of their weak adsorption, and very few studies have been able to achieve it via a chemiresistive mechanism. H...
Article
Full-text available
We report Layer-by-Layer (LbL) self-assembly of pillared two-dimensional (2D) multilayers, from water, onto a wide range of substrates. This LbL method uses a small molecule, tris(2-aminoethyl) amine (TAEA), and a colloidal dispersion of Ti 3 C 2 T x MXene to LbL self-assemble (MXene/TAEA) n multilayers, where n denotes the number of bilayers. Asse...
Article
We report on the thermal stability of multilayered V2CTx MXene under different atmospheres by combining in situ Raman Spectroscopy with ex situ X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), and Scanning Electron Microscopy (SEM) in order to elucidate and monitor molecular, electronic, and structural changes of both the surface an...
Article
Full-text available
In article number 1806931, flexible and freestanding films of 2D vanadium carbide MXene (V2CTx) are prepared by Majid Beidaghi and co‐workers and used as pseudocapacitive electrodes. The assembled films show excellent chemical and electrochemical stability in contrast to delaminated 2D V2CTx sheets, which rapidly oxidize in ambient conditions. The...
Article
The capacitive properties of two-dimensional (2D) transition metal carbides/nitrides (MXenes) have been the focus of much research in recent years. MXenes store charge by the pseudocapacitance mechanism (fast surface redox reactions) but can deliver their stored charge at much higher rates compared to other pseudocapacitive materials. Herein, the d...
Article
Two-dimensional (2D) titanium carbide MXene (Ti3C2Tx) has shown great promise as a high performance electrode material for electrochemical capacitors (ECs). However, similar to other 2D materials, processing MXenes into freestanding films results in their restacking, decreasing ion transport inside the electrodes. This problem significantly hinders...
Chapter
This paper highlights the sintering and stability issues of yttrium and ytterbium co-doped barium zirconium cerium oxide, BaZr0.1Ce0.7Y0.1Yb0.1O3-? (BZCYYb), powders and electrolyte disks under conditions relevant to Solid Oxide Fuel Cell (SOFC) fabrication and operation. It also illustrates the effects of sintering temperature and BZCYYb contact w...
Article
Full-text available
Fundamentals of synthesis, sintering issues, and chemical stability of BaZr0.1Ce0.7Y0.1Yb0.1O3-δ (BZCYYb) proton conducting electrolyte material were studied. Solid state reaction (SSR) and glycine nitrate process (GNP) methods were used to synthesize BZCYYb powders. The GNP method produced powders with higher purity and smaller particle size in re...
Article
Full-text available
Pure titanium nanoparticles were synthesized by utilizing Electromagnetic Levitation Melting Gas Condensation (ELM-GC) method. Pure bulk titanium samples were melted and evaporated by electromagnetic levitation technique in an inert gas atmosphere in a silica tube. Titanium nanoparticles were formed from ascending vapor by employing high purity arg...
Conference Paper
Full-text available
Aluminum reinforced with a large amount (up to about 55 vol.%) of Al3Ti particles can be fabricated from Al-20Ti elemental nanometer-sized powder mixture via in-situ two step hot press sintering (TSS). For production of intermetallic reinforced in-situ composite, TSS can provide elevated temperature to facilitate the formation of intermetallic phas...

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Projects

Project (1)
Project
Developing a safer and more efficient Li-ion alternative battery system using Aluminum metal as anode and MXenes as the cathode.