Preparation and Electrochemical Properties of Graphene/MnO2 Nanocomposites for Supercapacitors

In the present work, we demonstrated a facile process to prepare graphene/MnO2composites via a simple hydrothermal method at 120 °C using KMnO4and graphene oxide as raw materials followed by reduction with or without hydrazine. The electrochemical performance of the graphene/MnO2composites were investigated in a neutral electrolyte of Na2SO4. Among these samples, the sample rGM3prepared without hydrazine show uniform morphology and the best electrochemical performance. The specific capacitance of rGM3is 169 F g-1at a specific current of 0.2 A g-1. It exhibits a maintenance of 75.5 % of the initial capacitance after 1000 cycles. The results manifest that the graphene/MnO2composites can be potentially applied in supercapacitors.

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Effect of Morphology of ZnCo2O4 Nanostructures on Electrochemical Performance

NANO ◽

10.1142/s1793292016500892 ◽

2016 ◽

Vol 11 (08) ◽

pp. 1650089 ◽

Cited By ~ 5

Author(s):

J. Y. Dong ◽

N. Zhang ◽

S. Y. Lin ◽

T. T. Chen ◽

M. Y. Zhang ◽

...

Keyword(s):

Electrochemical Performance ◽

Specific Surface ◽

Electrochemical Properties ◽

Specific Capacitance ◽

Hydrothermal Method ◽

Surface Area ◽

Specific Surface Area ◽

Nickel Foam ◽

High Specific Surface Area ◽

Active Materials

The ZnCo2O4 nanorods and nanosheets were grown on nickel foam by a facile and effective hydrothermal method, respectively. The effect of the morphologies of the nanostructures on electrochemical performance was investigated. Importantly, ZnCo2O4 nanorod electrodes with a high specific surface area exhibited a higher specific capacitance of 2457.4 F g[Formula: see text] at 2 A g[Formula: see text] and remarkable cycling stability with capacitance retention of 97.7% after 1000 cycles, which are superior to those of ZnCo2O4 nanosheet electrodes. Such a result is well explained. The investigation on the electrochemical properties of these two nanostructures as electrodes confirmed that the morphology of active materials has an important impact on electrochemical properties.

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A FACILE ONE-STEP HYDROTHERMAL METHOD TO PRODUCE GRAPHENE OXIDE/Fe2O3-NANOTUBES COMPOSITES AND ITS ELECTROCHEMICAL PROPERTIES

NANO ◽

10.1142/s1793292012500324 ◽

2012 ◽

Vol 07 (04) ◽

pp. 1250032 ◽

Cited By ~ 3

Author(s):

WEN FU ◽

CHUNNIAN CHEN

Keyword(s):

Graphene Oxide ◽

Electrochemical Properties ◽

Specific Capacitance ◽

Hydrothermal Method ◽

High Specific Capacitance ◽

Cyclic Voltammogram ◽

Transmission Electron Microscopy Analysis ◽

Electron Microscopy Analysis ◽

One Step ◽

Charge Discharge

The composites of graphene oxide/ Fe2O3-nanotubes (GO/ Fe2O3-NTs) have been fabricated through a facile one-step hydrothermal method. Fe2O3-NTs crystallines were homogeneously distributed on GO, which have been confirmed by transmission electron microscopy analysis (TEM). The structure, composition and electrochemical properties of GO/ Fe2O3-NTs composites were investigated by means of selective-area electron diffraction (SAED), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Raman spectra, cyclic voltammogram (CV) curves and galvanostatic charge–discharge curves. GO/ Fe2O3-NTs composites exhibit a high specific capacitance of 133.2 Fg-1in 1 M Li2SO4electrolyte. In addition, the GO/ Fe2O3-NTs composites electrode shows good long-term cycle stability (only 9% decrease of the specific capacitance is observed after 1000 charge–discharge cycles).

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Synthesis of novel cyclodextrin-modified reduced graphene oxide composites by a simple hydrothermal method

RSC Advances ◽

10.1039/c8ra07807f ◽

2018 ◽

Vol 8 (66) ◽

pp. 37623-37630 ◽

Cited By ~ 1

Author(s):

Qingli Huang ◽

MingYan Li ◽

LiLi Wang ◽

Honghua Yuan ◽

Meng Wang ◽

...

Keyword(s):

Graphene Oxide ◽

Cancer Therapy ◽

Drug Release ◽

Hydrothermal Method ◽

Reduced Graphene Oxide ◽

Sustained Drug Release ◽

Simple Hydrothermal Method ◽

Ph Response ◽

Reduced Graphene ◽

Oxide Composites

The rGO@CD@PEG@FA nanocomposite showed the stimulative effect of heat, pH response, and sustained drug release for cancer therapy

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A Facile One-Pot Stepwise Hydrothermal Method for the Synthesis of 3D MoS2/RGO Composites with Improved Lithium Storage Properties

NANO ◽

10.1142/s1793292019500371 ◽

2019 ◽

Vol 14 (03) ◽

pp. 1950037 ◽

Cited By ~ 1

Author(s):

Bingning Wang ◽

Xuehua Liu ◽

Binghui Xu ◽

Yanhui Li ◽

Dan Xiu ◽

...

Keyword(s):

Graphene Oxide ◽

Electrochemical Performance ◽

Hydrothermal Method ◽

Hydrothermal Treatment ◽

Active Material ◽

Rate Capability ◽

Lithium Ion ◽

Reversible Capacity ◽

Lithium Storage ◽

One Pot

Three-dimensional reduced graphene oxide (RGO) matrix decorated with nanoflowers of layered MoS2 (denoted as 3D MoS2/RGO) have been synthesized via a facile one-pot stepwise hydrothermal method. Graphene oxide (GO) is used as precursor of RGO and a 3D GO network is formed in the first-step of hydrothermal treatment. At the second stage of hydrothermal treatment, nanoflowers of layered MoS2 form and anchor on the surface of previously formed 3D RGO network. In this preparation, thiourea not only induces the formation of the 3D architecture at a relatively low temperature, but also works as sulfur precursor of MoS2. The synthesized composites have been investigated with XRD, SEM, TEM, Raman spectra, TGA, N2 sorption technique and electrochemical measurements. In comparison with normal MoS2/RGO composites, the 3D MoS2/RGO composite shows improved electrochemical performance as anode material for lithium-ion batteries. A high reversible capacity of 930[Formula: see text]mAh[Formula: see text][Formula: see text][Formula: see text]g[Formula: see text] after 130 cycles under a current density of 200[Formula: see text]mA[Formula: see text][Formula: see text][Formula: see text]g[Formula: see text] as well as good rate capability and superior cyclic stability have been observed. The superior electrochemical performance of the 3D MoS2/RGO composite as anode active material for lithium-ion battery is ascribed to its robust 3D structures, enhanced surface area and the synergistic effect between graphene matrix and the MoS2 nanoflowers subunit.

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Nitrogen-doped reduced graphene oxide and aniline based redox additive electrolyte for a flexible supercapacitor

RSC Advances ◽

10.1039/c6ra11521g ◽

2016 ◽

Vol 6 (72) ◽

pp. 67898-67909 ◽

Cited By ~ 18

Author(s):

K. Vijaya Sankar ◽

R. Kalai Selvan ◽

R. Hari Vignesh ◽

Y. S. Lee

Keyword(s):

Graphene Oxide ◽

Hydrothermal Method ◽

Reduced Graphene Oxide ◽

Flexible Structure ◽

Simple Hydrothermal Method ◽

Nitrogen Doped ◽

Flexible Supercapacitor ◽

Reduced Graphene

Nitrogen-doped reduced graphene oxide (N-rGO) with a flexible structure was prepared by simple hydrothermal method. The N-rGO flexible supercapacitor fabricated and improved the performance using aniline as redox additive.

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The Sn–C bond at the interface of a Sn2Nb2O7–Super P nanocomposite for enhanced electrochemical performance

New Journal of Chemistry ◽

10.1039/c9nj06281e ◽

2020 ◽

Vol 44 (11) ◽

pp. 4478-4485

Author(s):

Xingang Kong ◽

Jiarui Zhang ◽

Qinqin Gong ◽

Jianfeng Huang ◽

Lixiong Yin ◽

...

Keyword(s):

Electrochemical Performance ◽

Lithium Ion Batteries ◽

Hydrothermal Method ◽

Anode Material ◽

Lithium Ion ◽

Simple Hydrothermal Method ◽

Enhanced Electrochemical Performance

A Sn2Nb2O7–Super P nanocomposite (SNO–SP) as an anode material for lithium ion batteries is successfully synthesized through a simple hydrothermal method.

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Nb2O5/graphene nanocomposites for electrochemical energy storage

RSC Advances ◽

10.1039/c5ra07895d ◽

2015 ◽

Vol 5 (74) ◽

pp. 59997-60004 ◽

Cited By ~ 47

Author(s):

Paulraj Arunkumar ◽

Ajithan G. Ashish ◽

Binson Babu ◽

Som Sarang ◽

Abhin Suresh ◽

...

Keyword(s):

Graphene Oxide ◽

Energy Storage ◽

Hydrothermal Method ◽

Reduced Graphene Oxide ◽

Electrochemical Energy Storage ◽

Graphene Nanocomposites ◽

Simple Hydrothermal Method ◽

Reduced Graphene ◽

Graphene Oxide Sheets ◽

Electrochemical Energy

Here we report the synthesis of Nb2O5/graphene nanocomposites, through a simple hydrothermal method, with Nb2O5 nanoparticles anchored on reduced graphene oxide sheets.

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N-Doped carbon decorated with molybdenum disulfide with excellent electrochemical performance for lithium-ion batteries

RSC Advances ◽

10.1039/c6ra15361e ◽

2016 ◽

Vol 6 (79) ◽

pp. 75626-75631 ◽

Cited By ~ 5

Author(s):

Jinbao Liu ◽

Yilin Liu ◽

Yani Ai ◽

Hongyan Chen ◽

Chenqi Feng ◽

...

Keyword(s):

Electrochemical Performance ◽

Lithium Ion Batteries ◽

Hydrothermal Method ◽

Molybdenum Disulfide ◽

Lithium Ion ◽

Two Dimensional ◽

Simple Hydrothermal Method ◽

Excellent Electrochemical Performance

Two-dimensional MoS2 nanoplates within N-doped carbon from polyaniline (PANI) were fabricated by a simple hydrothermal method.

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Facile synthesis of Sn/MoS2/C composite as an anode material for lithium-ion batteries with outstanding performance

New Journal of Chemistry ◽

10.1039/c5nj02368h ◽

2016 ◽

Vol 40 (2) ◽

pp. 1263-1268 ◽

Cited By ~ 8

Author(s):

Hongqiang Wang ◽

Qichang Pan ◽

Jing Chen ◽

Yahui Zan ◽

Youguo Huang ◽

...

Keyword(s):

Electrochemical Performance ◽

Lithium Ion Batteries ◽

Hydrothermal Method ◽

Anode Material ◽

Lithium Ion ◽

Facile Synthesis ◽

Simple Hydrothermal Method

A Sn/MoS2/C composite has been synthesized using a simple hydrothermal method with stable electrochemical performance.

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The effect of temperature on morphology and electrochemical properties of NiCo2S4 by hydrothermal synthesis

Functional Materials Letters ◽

10.1142/s1793604718500637 ◽

2018 ◽

Vol 11 (03) ◽

pp. 1850063

Author(s):

Yanwei Sui ◽

Haihua Hu ◽

Yuanming Zhang ◽

Bin Tang ◽

Jiqiu Qi ◽

...

Keyword(s):

Hydrothermal Synthesis ◽

Electrochemical Properties ◽

Specific Capacitance ◽

Hydrothermal Method ◽

Current Density ◽

Level Structure ◽

Hydrothermal Process ◽

Effect Of Temperature ◽

Second Step ◽

Carbon Sphere

The hydrothermal method, using the template is a conspicuous way to change the morphology of the product, so it is used widely in many reports. The effect of temperature on morphology of NiCo2S4 by hydrothermal synthesis and its electrochemical properties is distinct as high-performance electrode materials for supercapacitors. With the help of the template (carbon sphere), different morphologies of NiCo2S4 under 90[Formula: see text]C, 120[Formula: see text]C and 180[Formula: see text]C were obtained. They have different properties after electrochemical analysis. In order to build a hierarchical multi-level structure, two-step vulcanization was carried out at each temperature, resulting in the difference in the morphology and performance of the six sample of electrodes. The obtained NiCo2S4 electrodes exhibit 1000[Formula: see text]F[Formula: see text]g[Formula: see text] at the current density of 1[Formula: see text]A[Formula: see text]g[Formula: see text] in the second-step of the hydrothermal process under 120[Formula: see text]C, which is superior to the microblocks NiCo2S4 electrode (90[Formula: see text]C, 888[Formula: see text]F[Formula: see text]g[Formula: see text] at the current density of 1[Formula: see text]A[Formula: see text]g[Formula: see text]) and microparticles NiCo2S4 electrode (180[Formula: see text]C, 574[Formula: see text]F[Formula: see text]g[Formula: see text] at the same current density) in the second-step hydrothermal, which shows a high-rate capability (640[Formula: see text]F[Formula: see text]g[Formula: see text] at 20[Formula: see text]A[Formula: see text]g[Formula: see text]). The obtained nanoparticles NiCo2S4 under 180[Formula: see text]C in the first-step hydrothermal electrode had an excellent cycle retention rate (89.7%), although its specific capacitance was lower. At the same time, the specific capacitance of these sample electrodes obtained in the second-step hydrothermal process is superior to those from the first-step. It was mainly attributed to the fact that temperature can influence the morphology by controlling ion exchange. And our experiment aims to use the hydrothermal method and the template method to find a more suitable temperature range to provide more ideas.

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