Synthesis and Electrochemical Properties of Graphene Oxide/Acenaphthenequinone Composite

NANO ◽  
2015 ◽  
Vol 10 (02) ◽  
pp. 1550023 ◽  
Author(s):  
Chunnian Chen ◽  
Xuwang Fu ◽  
Wei Fan ◽  
Ting Ma
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
High Surface ◽  
High Surface Area ◽  
Impedance Spectra ◽  
Electrochemical Supercapacitors ◽  
Galvanostatic Charge ◽  
Ft Ir ◽  
A Current ◽  
Cycling Life

This paper reports a new graphene oxide (GO)/acenaphthenequinone composite as efficient electrode in electrochemical supercapacitors. The nanosheets of GO provide high surface area and conductivity. The microneedle-like acenaphthenequinone contributes convincible specific capacitance. The structure and morphology of GO/acenaphthenequinone composite have been characterized by field-emission scanning electron microscopy (FESEM), Fourier transform infrared (FT-IR) spectra and Raman spectra. According to the cyclic voltammetry (CV), galvanostatic charge/discharge, impedance spectra and cycling life analyses, the GO/acenaphthenequinone composite exhibits brilliant supercapacitors performance with a specific capacitance of 248.7 F g-1 at a scan rate of 1 mV s-1 and enhanced stability of about 82% (147.5 F g-1) of initial capacitance (179.8 F g-1) after 500 cycles at a current density of 1 A g-1.

scholarly journals Comparative Electrocatalytic Oxygen Evolution Reaction Studies of Spinel NiFe2O4 and Its Nanocarbon Hybrids

2021 ◽  
Author(s):  
Pratik V. Shinde ◽  
Rutuparna Samal ◽  
Chandra Sekhar Rout
Keyword(s):  
Graphene Oxide ◽  
Oxygen Evolution ◽  
Current Density ◽  
Transition Metal Oxides ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
High Performance ◽  
High Surface ◽  
High Surface Area ◽  
A Current

AbstractElectrocatalytic oxygen evolution reaction (OER) is one of the crucial reactions for converting renewable electricity into chemical fuel in the form of hydrogen. To date, there is still a challenge in designing ideal cost-effective OER catalysts with excellent activity and robust durability. The hybridization of transition metal oxides and carbonaceous materials is one of the most effective and promising strategies to develop high-performance electrocatalysts. Herein, this work synthesized hybrids of NiFe2O4 spinel materials with two-dimensional (2D) graphene oxide and one-dimensional (1D) carbon nanotubes using a facile solvothermal approach. Electrocatalytic activities of NiFe2O4 with 2D graphene oxide toward OER were realized to be superior even to the 1D carbon nanotube-based electrocatalyst in terms of overpotential to reach a current density of 10 mA/cm2 as well as Tafel slopes. The NiFe2O4 with 2D graphene oxide hybrid exhibits good stability with an overpotential of 327 mV at a current density of 10 mA/cm2 and a Tafel slope of 103 mV/dec. The high performance of NiFe2O4 with 2D graphene oxide is mainly attributed to its unique morphology, more exposed active sites, and a porous structure with a high surface area. Thus, an approach of hybridizing a metal oxide with a carbonaceous material offers an attractive platform for developing an efficient electrocatalyst for water electrochemistry applications.

Efficient Preparation of Spongy-Like Porous-Activated Carbon from Waste Millfeed Towards High Performance Supercapacitors

NANO ◽  
2020 ◽  
Vol 15 (08) ◽  
pp. 2050106
Author(s):  
Rong-Rong Han ◽  
Hao-Yan Zhu ◽  
Min-Peng Li ◽  
Wen-Tong Yang ◽  
Chun Lu ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Activated Carbon ◽  
Specific Capacitance ◽  
Surface Area ◽  
Current Density ◽  
High Surface ◽  
High Surface Area ◽  
High Specific Capacitance ◽  
A Current ◽  
Porous Activated Carbon

Biomass-based activated porous carbon (PC) with large porosity and high surface area has been considered as potential electrode material for supercapacitors. The spongy-like porous-activated carbon (SPAC) was prepared from millfeed by one-step carbonization/activation with KOH treatment. It shows three-dimensional (3D) spongy-like structure and high specific surface area (1535[Formula: see text]m2[Formula: see text]g[Formula: see text]). The SPAC electrode exhibits a high specific capacitance (237.9[Formula: see text]F[Formula: see text]g[Formula: see text] at a current density of 0.5[Formula: see text]A[Formula: see text]g[Formula: see text]) and a superior cycle stability (the capacitance retention of 95% after 10[Formula: see text]000 cycles at 2[Formula: see text]A[Formula: see text]g[Formula: see text]) in 2[Formula: see text]M KOH electrolyte, while the SPAC reveals a high specific capacitance of 157[Formula: see text]F[Formula: see text]g[Formula: see text] at 0.5[Formula: see text]A[Formula: see text]g[Formula: see text], good electrochemical stability with 93% capacitance retention after 5000 cycles in ionic liquids. Furthermore, the specific capacitance of SPAC//SPAC supercapacitor reaches 82.1[Formula: see text]F[Formula: see text]g[Formula: see text] at a current density of 0.5[Formula: see text]A[Formula: see text]g[Formula: see text] and achieves a high capacitance retention of 75% when the charging current increases to 10[Formula: see text]A[Formula: see text]g[Formula: see text] in 2[Formula: see text]M KOH electrolyte. The SPAC//SPAC supercapacitor possesses a high specific capacitance of 29.6[Formula: see text]F[Formula: see text]g[Formula: see text] at 0.5[Formula: see text]A[Formula: see text]g[Formula: see text] and a preeminent energy density of 27.8[Formula: see text]Wh[Formula: see text]kg[Formula: see text] (at a power density of 640[Formula: see text]W[Formula: see text]kg[Formula: see text]) in ionic liquids. This paper provides a convenient approach to synthesize low-cost biomass-based carbon material for supercapacitor applications.

scholarly journals Nitrogen doped hierarchical activated carbons derived from polyacrylonitrile fibers for CO2 adsorption and supercapacitor electrodes

RSC Advances ◽  
2018 ◽  
Vol 8 (52) ◽  
pp. 29767-29774 ◽  
Author(s):  
L. Zheng ◽  
W. B. Li ◽  
J. L. Chen
Keyword(s):  
Specific Capacitance ◽  
Surface Area ◽  
Current Density ◽  
Co2 Adsorption ◽  
Activated Carbons ◽  
High Surface ◽  
High Surface Area ◽  
Nitrogen Doped ◽  
A Current

Nitrogen doped activated carbons with high surface area up to 3797 m2 g−1 exhibit specific capacitance of 231 F g−1 at a current density of 10 A g−1.

Functionalized Nano-graphene Oxide as Multi-modal Clinic for Effective Drug Delivery

2017 ◽  
Vol 10 (4) ◽  
pp. 3768-3771
Author(s):  
Soumitra Satapathi ◽  
Rutusmita Mishra ◽  
Manisha Chatterjee ◽  
Partha Roy ◽  
Somesh Mohapatra
Keyword(s):  
Drug Delivery ◽  
Graphene Oxide ◽  
Cancer Cell ◽  
High Surface ◽  
High Surface Area ◽  
Cancer Cell Line ◽  
Xrd Analysis ◽  
Graphene Derivatives ◽  
Nano Graphene

Nano-materials based drug delivery modalities to specific organs and tissues has become one of the critical endeavors in pharmaceutical research. Recently, two-dimensional graphene has elicited considerable research interest because of its potential application in drug delivery systems. Here we report, the drug delivery applications of PEGylated nano-graphene oxide (nGO-PEG), complexed with a multiphoton active and anti-cancerous diarylheptanoid drug curcumin. Specifically, graphene-derivatives were used as nanovectors for the delivery of the hydrophobic anticancer drug curcumin due to its high surface area and easy surface functionalization. nGO was synthesized by modified Hummer’s method and confirmed by XRD analysis. The formation of nGO, nGO-PEG and nGO-PEG-Curcumin complex were monitored through UV-vis, IR spectroscopy. MTT assay and AO/EB staining found that nGO-PEG-Curcumin complex afforded highly potent cancer cell killing in vitro with a human breast cancer cell line MCF7.

scholarly journals Pd Nanoparticles Stabilized on the Cross-Linked Melamine-Based SBA-15 as a Catalyst for the Mizoroki–Heck Reaction

2021 ◽  
Author(s):  
Ayat Nuri ◽  
Abolfazl Bezaatpour ◽  
Mandana Amiri ◽  
Nemanja Vucetic ◽  
Jyri-Pekka Mikkola ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Inductively Coupled Plasma ◽  
High Surface ◽  
High Surface Area ◽  
Coupling Reaction ◽  
Pd Nanoparticles ◽  
Significant Activity ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Ft Ir

AbstractMesoporous SBA-15 silicate with a high surface area was prepared by a hydrothermal method, successively modified by organic melamine ligands and then used for deposition of Pd nanoparticles onto it. The synthesized materials were characterized with infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), nitrogen physisorption, scanning electron microscopy (SEM) coupled with energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR) and inductively coupled plasma (ICP-OES). The catalyst was effectively used in the Mizoroki–Heck coupling reaction of various reactants in the presence of an organic base giving the desired products in a short reaction time and with small catalysts loadings. The reaction parameters such as the base type, amounts of catalyst, solvents, and the temperature were optimized. The catalyst was easily recovered and reused at least seven times without significant activity losses. Graphic Abstract

scholarly journals Attached β-cyclodextrin/γ-(2,3-epoxypropoxy) propyl trimethoxysilane to graphene oxide and its application in copper removal

2017 ◽  
Vol 75 (10) ◽  
pp. 2403-2411 ◽  
Author(s):  
Zongxue Yu ◽  
Qi Chen ◽  
Liang Lv ◽  
Yang Pan ◽  
Guangyong Zeng ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Esterification Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cavity Structure ◽  
Optimum Ph ◽  
Exchange Adsorption ◽  
Langmuir Isotherm Model

The environmental applications of graphene oxide and β-cyclodextrin (β-CD) have attracted great attention since their first discovery. Novel nanocomposites were successfully prepared by using an esterification reaction between β-cyclodextrin/γ-(2,3-epoxypropoxy) propyl trimethoxysilane grafted graphene oxide (β-CD/GPTMS/GO). The β-CD/GPTMS/GO nanocomposites were used to remove the Cu2+ from aqueous solutions. The characteristics of β-CD/GPTMS/GO were detected by scanning electron microscopy (SEM), Fourier transform infrared, X-ray diffraction (XRD), thermogravimetric analysis (TG) and energy dispersive X-ray (EDX). The dispersibility of graphene oxide was excellent due to the addition of β-CD. The adsorption isotherms data obtained at the optimum pH 7 were fitted by Langmuir isotherm model. The excellent adsorption properties of β-CD/GPTMS/GO for Cu2+ ions could be attributed to the apolar cavity structure of β-CD, the high surface area and abundant functional groups on the surface of GO. The adsorption patterns of β-CD/GPTMS/GO were electrostatic attraction, formation of host-guest inclusion complexes and the ion exchange adsorption. The efficient adsorption of β-CD/GPTMS/GO for Cu2+ ions suggested that these novel nanocomposites may be ideal candidates for removing other cation pollutants from waste water.

scholarly journals Liquid Phase Synthesis of CoP Nanoparticles with High Electrical Conductivity for Advanced Energy Storage

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Guo-Qun Zhang ◽  
Bo Li ◽  
Mao-Cheng Liu ◽  
Shang-Ke Yuan ◽  
Leng-Yuan Niu
Keyword(s):  
Electrical Conductivity ◽  
Energy Storage ◽  
Liquid Phase ◽  
Specific Capacitance ◽  
Current Density ◽  
High Surface ◽  
High Surface Area ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Materials

Transition metal phosphide alloys possess the metalloid characteristics and superior electrical conductivity and are a kind of high electrical conductive pseudocapacitive materials. Herein, high electrical conductive cobalt phosphide alloys are fabricated through a liquid phase process and a nanoparticles structure with high surface area is obtained. The highest specific capacitance of 286 F g−1 is reached at a current density of 0.5 A g−1. 63.4% of the specific capacitance is retained when the current density increased 16 times and 98.5% of the specific capacitance is maintained after 5000 cycles. The AC//CoP asymmetric supercapacitor also shows a high energy density (21.3 Wh kg−1) and excellent stability (97.8% of the specific capacitance is retained after 5000 cycles). The study provides a new strategy for the construction of high-performance energy storage materials by enhancing their intrinsic electrical conductivity.

scholarly journals Effect of Potassium Ions on the Formation of Mixed-Valence Manganese Oxide/Graphene Nanocomposites

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1245 ◽  
Author(s):  
Wooree Jang ◽  
Dae-Young Jeon ◽  
Youn-Sik Lee ◽  
Hye Young Koo
Keyword(s):  
Graphene Oxide ◽  
Manganese Oxide ◽  
Mixed Valence ◽  
High Specific Capacitance ◽  
Potassium Ions ◽  
Electrochemical Supercapacitors ◽  
One Pot ◽  
Graphene Nanocomposites ◽  
Reduced Graphene ◽  
A Current

One-pot synthesis of mixed-valence manganese oxide (MnOx)/potassium ion-doped reduced graphene oxide (rGO) composites for efficient electrochemical supercapacitors is introduced. Using manganese nitrate and potassium permanganate as co-precursors for the MnOx and by directly annealing the rGO without tedious purification steps, as described herein, MnOx/rGO composites with a high specific capacitance of 1955.6 F g−1 at a current density of 1 A g−1 are achieved. It is found that the presence of potassium ions helps in the development of mixed-valence MnOx on the surface of the rGO.

scholarly journals Methods to Scale Down Graphene Oxide Size and Size Implication in Anti-cancer Applications

2020 ◽  
Vol 8 ◽  
Author(s):  
Immacolata Tufano ◽  
Raffaele Vecchione ◽  
Paolo Antonio Netti
Keyword(s):  
Graphene Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Nir Absorption ◽  
Scale Down ◽  
Considerable Impact ◽  
2D Nanomaterials ◽  
The Individual ◽  
Post Synthesis ◽  
Cancer Diagnosis And Therapy

Despite considerable progress in the comprehension of the mechanisms involved in the origin and development of cancer, with improved diagnosis and treatment, this disease remains a major public health challenge with a considerable impact on the social and economic system, as well as on the individual. One way to improve effectiveness and reduce side effects is to consider responsive stimuli delivery systems that provide tailor-made release profiles with excellent spatial and temporal control. 2D nanomaterials possess special physicochemical properties (e.g., light, ultrasonic and magnetic responses) and biological behaviors such as endocytosis, biodistribution, biodegradation, and excretory pathways, which lead to their use in various biomedical applications. In particular, among 2D nanomaterials, graphene and its derivatives, namely graphene oxide (GO) nanomaterials, have attracted enormous attention in cancer diagnosis and therapy because they combine, in a unique material, extremely small size, NIR absorption, delocalized electrons, extremely high surface area, and versatile surface functionality. Taking into account the fundamental role played by GO size, in this review, we summarize the main methods employed to reduce and homogenize in nanometric scale the lateral dimensions of graphene oxide produced by chemical exfoliation of graphite, as well as post-synthesis separation techniques to uniform the size. We also discuss the implication of the small size in cancer treatment by exploiting GO nanocarriers as an effective theranostic tool.

scholarly journals Modelling and Experimentation on Mechanical Properties of Graphene-Oxide Cement

2019 ◽  
Vol 274 ◽  
pp. 05004
Author(s):  
Zhiyuan Lin ◽  
Ding Fan ◽  
Shangtong Yang
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Elastic Properties ◽  
High Surface ◽  
High Surface Area ◽  
Accurate Estimation ◽  
Dispersion Property ◽  
Length Scales ◽  
Analysis And Design ◽  
Strength And Durability

Cementitious nano-composites have recently attracted considerable research interest in order to improve their properties such as strength and durability. Graphene oxide (GO) is being considered as an ideal candidate for enhancing the mechanical properties of the cement due to its good dispersion property and high surface area. Much of work has been done on experimentally investigating the mechanical properties of GO-cementitious composites; but there are currently no models for accurate estimation of their mechanical properties, making proper analysis and design of GO-cement based materials a major challenge. This paper attempts to develop a novel multi-scale analytical model for predicting the elastic modulus of GO-cement taking into account the GO/cement ratio, porosity and mechanical properties of different phases. This model employs Eshelby tensor and Mori-Tanaka solution in the process of upscaling the elastic properties of GO-cement through different length scales. In-situ micro bending tests were conducted to elucidate the behavior of the GO-cement composites and verify the proposed model. The obtained results showed that the addition of GO can change the morphology and enhance the mechanical properties of the cement. The developed model can be used as a tool to determine the elastic properties of GO-cement through different length scales.

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