A5075088191- Supercapacitor Materials and Fabrication
- Conducting polymers and applications
- Advanced battery technologies research
- Advanced Sensor and Energy Harvesting Materials
- Advancements in Battery Materials
- Electrocatalysts for Energy Conversion
- Graphene research and applications
- Electrochemical sensors and biosensors
- Electrochemical Analysis and Applications
- Advanced Battery Materials and Technologies
- Advanced Photocatalysis Techniques
- Advanced Battery Technologies Research
- Gut microbiota and health
- Quantum Dots Synthesis And Properties
- Nanocluster Synthesis and Applications
- Tactile and Sensory Interactions
- Enterobacteriaceae and Cronobacter Research
- Advanced Nanomaterials in Catalysis
- Advanced Memory and Neural Computing
- Nanotechnology research and applications
- Boron Compounds in Chemistry
- Dielectric materials and actuators
- Copper-based nanomaterials and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Material Properties and Applications
University of California, Los Angeles
2016-2025
California NanoSystems Institute
2015-2024
Ain Shams University
2024
Chest Diseases Hospital
2024
Los Angeles City College
2015-2020
University of California System
2019
Cairo University
2009-2018
Al-Azhar University
2018
Donghua University
2015
Although electrochemical capacitors (ECs), also known as supercapacitors or ultracapacitors, charge and discharge faster than batteries, they are still limited by low energy densities slow rate capabilities. We used a standard LightScribe DVD optical drive to do the direct laser reduction of graphite oxide films graphene. The produced mechanically robust, show high electrical conductivity (1738 siemens per meter) specific surface area (1520 square meters gram), can thus be directly EC...
Supercapacitors now play an important role in the progress of hybrid and electric vehicles, consumer electronics, military space applications. There is a growing demand developing supercapacitor systems to overcome energy density limitations current generation carbon-based supercapacitors. Here, we demonstrate 3D high-performance supercapacitors microsupercapacitors based on graphene MnO2 by rationally designing electrode microstructure combining active materials with electrolytes that...
3D cellular graphene films with open porosity, high electrical conductivity, and good tensile strength, can be synthesized by a method combining freeze-casting filtration. The resulting supercapacitors based on porous reduced oxide (RGO) film exhibit extremely specific power densities energy densities. fabrication process provides an effective means for controlling the pore size, electronic loading mass of electrode materials, toward devices energy-storage performance.
Engineering a low-cost graphene-based electronic device has proven difficult to accomplish via single-step fabrication process. Here we introduce facile, inexpensive, solid-state method for generating, patterning, and tuning of materials. Laser scribed graphene (LSG) is shown be successfully produced selectively patterned from the direct laser irradiation graphite oxide films under ambient conditions. Circuits complex designs are directly onto various flexible substrates without masks,...
The search for faster, safer, and more efficient energy storage systems continues to inspire researchers develop new materials with ultrahigh performance. Mesoporous nanostructures are interesting supercapacitors because of their high surface area, controlled porosity, large number active sites, which promise the utilization full capacitance materials. Herein, highly ordered mesoporous CuCo2O4 nanowires have been synthesized by nanocasting from a silica SBA-15 template. These exhibit...
The increasing demand for energy has triggered tremendous research efforts the development of lightweight and durable storage devices. Herein, we report a simple, yet effective, strategy high-performance supercapacitors by building three-dimensional pseudocapacitive CuO frameworks with highly ordered interconnected bimodal nanopores, nanosized walls (∼4 nm) large specific surface area 149 m2 g–1. This interesting electrode structure plays key role in providing facilitated ion transport,...
A facile method to convert biomolecule-based carbon nanodots (CNDs) into high-surface-area 3D-graphene networks with excellent electrochemical properties is presented. Initially, CNDs are synthesized by microwave-assisted thermolysis of citric acid and urea according previously published protocols. Next, the annealed up 400 °C in a tube furnace an oxygen-free environment. Finally, films thermolyzed converted open porous 3D turbostratic graphene (3D-ts-graphene) irradiation infrared laser....
The global supercapacitor market has been growing rapidly during the past decade. Today, virtually all commercial devices use activated carbon. In this work, it is shown that laser treatment of carbon electrodes results in formation microchannels can connect internal pores with surrounding electrolyte. These serve as electrolyte reservoirs turn shorten ion diffusion distance and enable better interaction between electrode surfaces ions. capacitance be further increased through fast...
The need for enhanced energy storage and improved catalysts has led researchers to explore advanced functional materials sustainable production storage. Herein, we demonstrate a reductive electrosynthesis approach prepare layer-by-layer (LbL) assembled trimetallic Fe–Co–Ni metal–organic framework (MOF) in which the metal cations within each layer or at interface of two layers are linked one another by bridging 2-amino-1,4-benzenedicarboxylic acid linkers. Tailoring catalytically active sites...
Nanostructures of the conducting polymer poly(3,4-ethylenedioxythiophene) with large surface areas enhance performance energy storage devices such as electrochemical supercapacitors. However, until now, high aspect ratio nanofibers this could only be deposited from vapor-phase, utilizing extrinsic hard templates electrospun and anodized aluminum oxide. These routes result in low conductivity require postsynthetic template removal, conditions that stifle development electronics. Here we...
Abstract Discovering efficient pseudocapacitive charge storage materials has become one of the grand challenges to reduce gap between high energy density batteries and power durable electrical double‐layer capacitors. This research direction is facilitated by introduction redox‐active species that add Faradaic system. However, astonishing abilities organic redox increase are insufficient compensate for their poor conductivity inferior cyclability. Herein, it proposed these can be...
Abstract Layered double hydroxides (LDHs) stand out as versatile structural platforms for modulating the electronic structure of highly reactive earth‐abundant transition metal‐based electrocatalysts hydrogen evolution reaction (HER), oxygen (OER), and reduction (ORR). Herein, a Ni‐Co‐Fe LDH, electrodeposited on Ni nanocones (NiNCs)‐decorated foam, acts morphology driving template to direct facile constant potential electrosynthesis NiCoFeB from K 2 B 4 O 7 solution. The amorphous tri‐metal...
Long cycle life and high energy/power density are imperative to energy storage systems. Polyaniline (PANI) has shown great potential as an electrode material but is limited by poor cycling rate performance. We present a molecular design approach of binding short-chain aniline trimers (ATs) carbon nanotubes (CNTs) through the formation amide covalent linkages enabled simple laser scribing technique. The covalently coupled AT/CNT (cc-AT/CNT) composite retains 80% its original capacitance after...
We demonstrate the practical applicability of Ni–Co–Mn–P as an efficient electrocatalyst active in all HER, OER, and ORR processes even under ultra-high mass loading over 22 mg cm −2 .
Polyaniline (PANi)/graphene nanocomposites have attracted tremendous interest because of their great potential in electrochemical energy storage applications, especially supercapacitors. We herein focus on the composite synthesis, device fabrication and particularly various techniques for improvement performance. It is imperative to take close control interface these nanostructured composites, which thus would lead desired synergistic effects cyclic stability with efficient diffusion...