One-step electrochemical synthesis of three-dimensional graphene foam loaded nickel–cobalt hydroxides nanoflakes and its electrochemical properties

2015 ◽  
Vol 152 ◽  
pp. 195-201 ◽  
Author(s):  
Shuang Dong ◽  
Anh Quang Dao ◽  
Bijuan Zheng ◽  
Zhengyan Tan ◽  
Chaoyang Fu ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Electrochemical Synthesis ◽  
Three Dimensional ◽  
Graphene Foam ◽  
Nickel Cobalt ◽  
One Step ◽  
Cobalt Hydroxides

Crystal morphology evolution of Ni–Co layered double hydroxide nanostructure towards high-performance biotemplate asymmetric supercapacitors

CrystEngComm ◽  
2018 ◽  
Vol 20 (46) ◽  
pp. 7428-7434 ◽  
Author(s):  
Chuan Jing ◽  
Xiaoli Liu ◽  
Xiaoying Liu ◽  
Debin Jiang ◽  
Biqin Dong ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
High Performance ◽  
Crystal Morphology ◽  
Three Dimensional ◽  
Morphology Evolution ◽  
Porous Structures ◽  
Asymmetric Supercapacitors ◽  
Nickel Cobalt ◽  
One Step ◽  
Double Hydroxide

Hierarchical three-dimensional (3D) porous structures of nickel–cobalt layered double hydroxide (LDH) are grown on diatomite biotemplate via one-step hydrothermal method.

Electrochemical synthesis and one step modification of PMProDot nanotubes and their enhanced electrochemical properties

2012 ◽  
Vol 48 (21) ◽  
pp. 2725 ◽  
Author(s):  
Thao M. Nguyen ◽  
Seungil Cho ◽  
Nitinun Varongchayakul ◽  
Daehyun Yoon ◽  
Joonil Seog ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Electrochemical Synthesis ◽  
One Step

Supercapacitance Property Study of 3D Open-Framework Prussian Blue in Neutral Electrolyte

2021 ◽  
Vol 13 (3) ◽  
pp. 436-446
Author(s):  
Wei Pan ◽  
Mu Zhang ◽  
Dongfeng Xue ◽  
Xudong Sun
Keyword(s):  
Electrochemical Properties ◽  
Prussian Blue ◽  
Electrode Materials ◽  
Low Cost ◽  
Three Dimensional ◽  
Particle Morphology ◽  
Precipitation Method ◽  
Dimensional Structure ◽  
Sem Image ◽  
One Step

Prussian blue is a kind compound with a consistent three-dimensional structure. Here we characterized a family of Prussian blue which could have reversible insertion of cations into materials. This study details comprehensive electrochemical property information about Prussian blue electrode materials and provides a method to evaluate a series of supercapacitor materials. These hexacyanoferrates were synthesized by one step precipitation method which was low cost. They exhibited extremely different apparent morphology in the scanning electron microscope (SEM) image. And then these Prussian blue electrode materials were evaluated on room temperature for their electrochemical properties. They show a different specific capacitance and redox voltage. The kinetic study reveals reasons that influence the electrochemical properties of these active materials. First, the particle morphology has a great effect on it; Second, transition metal cations modify the C≡N bond connected with it and then influence the bond connected with the Fe atom.

Graphene-based cobalt sulfide composite hydrogel with enhanced electrochemical properties for supercapacitors

2016 ◽  
Vol 40 (3) ◽  
pp. 2843-2849 ◽  
Author(s):  
Xiaoqian Meng ◽  
Huan Sun ◽  
Junwu Zhu ◽  
Huiping Bi ◽  
Qiaofeng Han ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Three Dimensional ◽  
Composite Hydrogel ◽  
Cobalt Sulfide ◽  
Step Method ◽  
One Step ◽  
Hydrogel Nanocomposites ◽  
Enhanced Electrochemical Performance

The three-dimensional cobalt sulfides/graphene hydrogel nanocomposites were prepared via a one-step method in a water–isopropanol system with enhanced electrochemical performance.

scholarly journals Enhancing the electrochemical properties of a nickel–cobalt-manganese ternary hydroxide electrode using graphene foam for supercapacitors applications

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
V. N. Kitenge ◽  
K. O. Oyedotun ◽  
O. Fasakin ◽  
D. J. Tarimo ◽  
N. F. Sylla ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Synthesis Method ◽  
Negative Electrode ◽  
Potential Range ◽  
Electrochemical Performances ◽  
Mass Loading ◽  
Graphene Foam ◽  
Nickel Cobalt

AbstractThis study has investigated the effect of the incorporation of graphene foam (GF) into the matrix of a ternary transition-metals hydroxide containing nickel, cobalt, and manganese for optimal electrochemical performances as electrodes for supercapacitors applications. An adopted simple, low-cost co-precipitation synthesis method involved the loading a mass of the ternary metal hydroxides (NiCoMn-TH) onto various GF mass loading so as to find ints effect on the electrochemical properties of the hydroxides. Microstructural and chemical composition of the various composite materials were investigated by employing scanning/transmission electron microscopy (SEM/TEM), x-ray diffraction (XRD), Raman spectroscopy, and N2 physisorption analysis among others. Electrochemical performances of the NiCoMn-TH/200 mg GF composite material evaluated in a three-electrode system using 1 M KOH solution revealed a maximum specific capacity around 178.6 mAh g−1 compared to 76.2 mAh g−1 recorded for the NiCoMn-TH pristine material at a specific current of 1 A g−1. The best mass loading of GF nanomaterial (200 mg GF), was then utilised as a positive electrode material for the design of a novel hybrid device. An assembled hybrid NiCoMn-TH/200 mg GF//CSDAC device utilizing the NiCoMn-TH/200 mg GF and activated carbon derived from the cocoa shell (CSDAC) as a positive and negative electrode, respectively, demonstrated a sustaining specific capacity of 23.4 mAh g−1 at a specific current of 0.5 A g−1. The device also yielded sustaining a specific energy and power of about 22.32 Wh kg−1 and 439.7 W kg−1, respectively. After a cycling test of over 15,000 cycles, the device could prove a coulombic efficiency of ~ 99.9% and a capacity retention of around 80% within a potential range of 0.0–1.6 V at a specific current of 3 A g−1. These results have demonstrated the prodigious electrochemical potentials of the as-synthesized material and its capability to be utilized as an electrode for supercapacitor applications.

Controllable Electrochemical Synthesis of Ag Hierarchical Micro/Nanostructures with High SERS-Activity

NANO ◽  
2020 ◽  
Vol 15 (04) ◽  
pp. 2050043
Author(s):  
Huayu Zhou ◽  
Jingjing Wang ◽  
Qiong Yang ◽  
Menglei Chen ◽  
Changsheng Song ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Current System ◽  
Three Dimensional ◽  
Constant Current ◽  
Localized Surface Plasmon ◽  
Excitation Wavelength ◽  
Raman Signal ◽  
Mixed Solution ◽  
Raman Enhancement ◽  
One Step

We report a one-step electrochemical deposition technique to prepare three-dimensional (3D) Ag hierarchical micro/nanostructured film consisting of well-crystallized Ag nanosheets grown on an indium tin oxide (ITO) conductive substrate. The Ag hierarchical micro/nanostructures were fabricated in the mixed solution of AgNO3 and sodium citrate in a constant current system at room temperature. Through reduction of Ag[Formula: see text] electrodeposited on the surface of ITO substrate, nanoparticles were grown to form nanosheets which further combined into 3D sphere-like microstructures. The 3D Ag micro/nanostructures have many sharp edges and nanoscale gaps which can give rise to good Raman-enhanced effect. Due to localized surface plasmon resonance (LSPR) effects, these special Ag micro/nanostructures exhibited good Raman-enhanced performance. Using Rhodamine 6G (R6G) molecules as probe molecule, we studied the influence of excitation wavelength on Raman enhancement. The results showed that the 532[Formula: see text]nm excitation wavelength is the best to obtain the strongest Raman signal and to reduce the influence of other impurity peaks. Using the as-synthesized Ag hierarchical micro/nanostructures, we can detect the 10[Formula: see text][Formula: see text]mol/L R6G aqueous solution, exhibiting great Raman-enhanced effect.

scholarly journals A Review on Additive Manufacturing Possibilities for Electrical Machines

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1940
Author(s):  
Muhammad Usman Naseer ◽  
Ants Kallaste ◽  
Bilal Asad ◽  
Toomas Vaimann ◽  
Anton Rassõlkin
Keyword(s):  
Additive Manufacturing ◽  
Large Scale ◽  
Three Dimensional ◽  
Electrical Machines ◽  
Electromagnetic Properties ◽  
Scale Production ◽  
Performance Parameters ◽  
Large Scale Production ◽  
One Step ◽  
Manufacturing Techniques

This paper presents current research trends and prospects of utilizing additive manufacturing (AM) techniques to manufacture electrical machines. Modern-day machine applications require extraordinary performance parameters such as high power-density, integrated functionalities, improved thermal, mechanical & electromagnetic properties. AM offers a higher degree of design flexibility to achieve these performance parameters, which is impossible to realize through conventional manufacturing techniques. AM has a lot to offer in every aspect of machine fabrication, such that from size/weight reduction to the realization of complex geometric designs. However, some practical limitations of existing AM techniques restrict their utilization in large scale production industry. The introduction of three-dimensional asymmetry in machine design is an aspect that can be exploited most with the prevalent level of research in AM. In order to take one step further towards the enablement of large-scale production of AM-built electrical machines, this paper also discusses some machine types which can best utilize existing developments in the field of AM.

A three-dimensional nerve guide conduit based on graphene foam/polycaprolactone

2021 ◽  
pp. 112110
Author(s):  
Neda Bahremandi Tolou ◽  
Hamidreza Salimijazi ◽  
Mahshid Kharaziha ◽  
Giuliana Faggio ◽  
Rosa Chierchia ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Graphene Foam

scholarly journals Is Dialdehyde Chitosan a Good Substance to Modify Physicochemical Properties of Biopolymeric Materials?

2021 ◽  
Vol 22 (7) ◽  
pp. 3391
Author(s):  
Sylwia Grabska-Zielińska ◽  
Alina Sionkowska ◽  
Ewa Olewnik-Kruszkowska ◽  
Katarzyna Reczyńska ◽  
Elżbieta Pamuła
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Physicochemical Properties ◽  
Silk Fibroin ◽  
Three Dimensional ◽  
Microscopy Imaging ◽  
Maximum Deformation ◽  
One Step ◽  
Chitosan Blends ◽  
Fourier Transfer Infrared Spectroscopy

The aim of this work was to compare physicochemical properties of three dimensional scaffolds based on silk fibroin, collagen and chitosan blends, cross-linked with dialdehyde starch (DAS) and dialdehyde chitosan (DAC). DAS was commercially available, while DAC was obtained by one-step synthesis. Structure and physicochemical properties of the materials were characterized using Fourier transfer infrared spectroscopy with attenuated total reflectance device (FTIR-ATR), swelling behavior and water content measurements, porosity and density observations, scanning electron microscopy imaging (SEM), mechanical properties evaluation and thermogravimetric analysis. Metabolic activity with AlamarBlue assay and live/dead fluorescence staining were performed to evaluate the cytocompatibility of the obtained materials with MG-63 osteoblast-like cells. The results showed that the properties of the scaffolds based on silk fibroin, collagen and chitosan can be modified by chemical cross-linking with DAS and DAC. It was found that DAS and DAC have different influence on the properties of biopolymeric scaffolds. Materials cross-linked with DAS were characterized by higher swelling ability (~4000% for DAS cross-linked materials; ~2500% for DAC cross-linked materials), they had lower density (Coll/CTS/30SF scaffold cross-linked with DAS: 21.8 ± 2.4 g/cm3; cross-linked with DAC: 14.6 ± 0.7 g/cm3) and lower mechanical properties (maximum deformation for DAC cross-linked scaffolds was about 69%; for DAS cross-linked scaffolds it was in the range of 12.67 ± 1.51% and 19.83 ± 1.30%) in comparison to materials cross-linked with DAC. Additionally, scaffolds cross-linked with DAS exhibited higher biocompatibility than those cross-linked with DAC. However, the obtained results showed that both types of scaffolds can provide the support required in regenerative medicine and tissue engineering. The scaffolds presented in the present work can be potentially used in bone tissue engineering to facilitate healing of small bone defects.

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