scholarly journals Stabilized Graphene Oxide Assisted Surfactants and Its Capacitance Performance

2020 ◽  
Author(s):  
Nurhafizah Md Disa
Keyword(s):  
Graphene Oxide ◽  
Capacitance Performance

Facile Synthesis of Ni–Mn Layered Double Hydroxide Nanopetals on 3D Reduced Graphene Oxide/Ni Foam for High-Performance Supercapacitors

NANO ◽  
2020 ◽  
Vol 15 (02) ◽  
pp. 2050021
Author(s):  
Qi Tang ◽  
Menghan Ye ◽  
Li Ma ◽  
Tao Zhou ◽  
Mengyu Gan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Layered Double Hydroxide ◽  
Electrode Material ◽  
Active Sites ◽  
Retention Rate ◽  
Ni Foam ◽  
Reduced Graphene ◽  
Capacitance Performance ◽  
Double Hydroxide

In this work, the Ni–Mn layered double hydroxide (Ni–Mn LDH) nanopetals are fabricated on three-dimensional reduced graphene oxide/Ni foam (RGO/NF) by one-step hydrothermal method, in which the suspension of graphene oxide (GO) is directly reduced by nickel foam (NF) to obtain NF/RGO. The composite, which consists of interconnected Ni–Mn LDH nanopetals, forms a macroporous structure. Such an open space can promote electrolyte dispersion and ion diffusion of active substances, thus enhancing capacitance performance. Remarkable, during crystal growth, RGO can not only provide active sites for Ni–Mn LDH nanopetals, but also effectively connect Ni–Mn LDH nanopetals to NF, further promoting the electrochemical behavior of composite material. Moreover, RGO possess reasonable chemical stability which can improve the mechanical properties of the composite to obtain good stability. The experimental results show that the NF/RGO electrode material with Ni–Mn LDH nanopetals has excellent specific capacitance of 2250[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text], good rate performance (the capacitance retention rate is still 64.0% at 10[Formula: see text]A[Formula: see text]g[Formula: see text] and excellent cycle life (45.1% at 10[Formula: see text]A[Formula: see text]g[Formula: see text] after 5000 cycles). NR/NM–LDH is used as the positive electrode and activated carbon is used as the negative electrode to assemble the asymmetric supercapacitor, the proper power density and energy density indicates that the NR/NM–LDH composite has great potential as an electrode material for supercapacitors.

Photovoltaic and capacitance performance of low-resistance ZnO nanorods incorporated into carbon nanotube-graphene oxide nanocomposites

2019 ◽  
Vol 307 ◽  
pp. 430-441 ◽  
Author(s):  
Mohamed Mokhtar Mohamed ◽  
Mohamed A. Ghanem ◽  
S.M. Reda ◽  
M. Khairy ◽  
E.M. Naguib ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Zno Nanorods ◽  
Low Resistance ◽  
Capacitance Performance

scholarly journals Synthesis of polypyrrole/nitrogen-doped porous carbon matrix composite as the electrode material for supercapacitors

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Minzhen Feng ◽  
Wei Lu ◽  
Yun Zhou ◽  
Ranran Zhen ◽  
Hongmei He ◽  
...  
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Porous Carbon ◽  
Synthesis Method ◽  
Carbon Matrix ◽  
Structure Characterization ◽  
Koh Activation ◽  
Nitrogen Doped ◽  
Matrix Surface ◽  
Capacitance Performance

Abstract Polypyrrole complex nitrogen-doped porous carbon matrix (PPy/N-PCM) was synthesized by a simple two-step method. Firstly, graphene oxide was prepared by the modified Hummers method. Secondly, Polypyrrole was compounded on the graphene oxide substrate, and the carbon matrix with a high specific surface area was obtained through high-temperature carbonization and KOH activation, and polypyrrole was used as a nitrogen source for the final nitrogen-doped composite material. The structure characterization of the carbon matrix and the final composite material shows that the carbon matrix surface has obvious porous structure, and the polypyrrole nanospheres grow uniformly on the porous carbon matrix surface. The electrochemical evaluation show that the prepared PPy/N-PCM has excellent supercapacitor performance, and its specific capacitance can reach 237.5 F g−1. When the current density reaches 10 A g−1, it has good cycle stability (the capacitance retention after 1000 charge and discharge is 88.53% of the initial capacitance value, which is better than pure PPy-60.76% and PPy/rGO-C-71.84%). The excellent capacitance performance, good-looking micro-morphology and simple synthesis method of the PPy/N-PCM provide the possibility for its commercialization.

Electrochemically reduced graphene oxide and its capacitance performance

2014 ◽  
Vol 148 (3) ◽  
pp. 903-908 ◽  
Author(s):  
Shu-bo Zhang ◽  
Yu-tao Yan ◽  
Yu-qiu Huo ◽  
Yang Yang ◽  
Ji-long Feng ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene ◽  
Capacitance Performance ◽  
Electrochemically Reduced Graphene Oxide

scholarly journals Preparation of Polyaniline/Graphene Oxide Thin Films Microelectrodes through Electrochemical Reduction at Different Potential Range for High-Performance Supercapacitors

2020 ◽  
Vol 32 (12) ◽  
pp. 3047-3056
Author(s):  
Mukta Das ◽  
Ashis K. Sarker
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Electrochemical Reduction ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Potential Range ◽  
Layer By Layer ◽  
Voltage Range ◽  
Assembly Method ◽  
Capacitance Performance

In this article, the fabrication and performance of supercapacitors prepared through electrochemical reduction applied at different voltage range from polyaniline/graphene oxide (PANi/GO) thin films, which are renewable materials with an excellent yield of energy conversion is reported. The PANi/GO thin film was reduced electrochemically with different potential windows, scan rate and number of cycles which was acquired using layer-by-layer (LBL) assembly method. The resultant electrodes displayed various specific capacitances after pre-reduction with different conditions.The influence of the electrochemical reduction was investigated by Raman spectroscopy and X-ray photoelectron spectroscopy for capacitance performance. The optimum conditions were explored for supercapacitor application and an elevated specific capacitance 2619 F cm-3 (areal capacitance 18.38 mF cm-2) at 1 mV s-1 obtaining the film reduced with applied potential of -0.87 to -0.5 V. This study could introduce the new possibilities for the improvement of the electrochemical reduction effects to the composite materials for high-performance supercapacitors.

Facile synthesis of a reduced graphene oxide/cobalt sulfide hybrid and its electrochemical capacitance performance

RSC Advances ◽  
2014 ◽  
Vol 4 (55) ◽  
pp. 29216-29222 ◽  
Author(s):  
Kai Dai ◽  
Dongpei Li ◽  
Luhua Lu ◽  
Qi Liu ◽  
Jiali Lv ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Specific Capacitance ◽  
Cobalt Sulfide ◽  
Facile Synthesis ◽  
Electrochemical Capacitance ◽  
Reduced Graphene ◽  
Capacitance Performance ◽  
Hydrothermal Approach

Reduced graphene oxide (RGO) in situ composites with cobalt sulfide (CoS) are achieved through a facile hydrothermal approach, and RGO/CoS presents a high specific capacitance of 1130 F g−1.

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