scholarly journals Further Thermal Reduction of Reduced Graphene Oxide Aerogel with Excellent Rate Performance for Supercapacitors

2019 ◽  
Vol 9 (11) ◽  
pp. 2188 ◽  
Author(s):  
Peihui Luo ◽  
Ying Lin
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Current Density ◽  
Three Dimensional ◽  
Rate Capability ◽  
Thermal Reduction ◽  
High Rate ◽  
Rate Performance ◽  
Freeze Dried ◽  
Reduced Graphene

Preparation of pure three-dimensional graphene (3DG) with high rate performance for supercapacitors is critical for fast rate charge/discharge. Here, 3DG was prepared via thermal annealing of freeze-dried reduced graphene oxide (RGO) hydrogel under inert gas protection. The formed 3DG as an electrode material for supercapacitors revealed a specific capacitance of 115 F·g−1 at a current density of 1 A·g−1, and a high capacitance retention of 70% as current density increased to 40 A·g−1. The excellent rate capability was mainly attributed to the reserved porous structure and higher electrical conductivity for 3DG after thermal reduction than its RGO hydrogel precursor.

Three-dimensional porous graphene/polyaniline composites for high-rate electrochemical capacitors

2014 ◽  
Vol 2 (41) ◽  
pp. 17489-17494 ◽  
Author(s):  
Qinqin Zhou ◽  
Yingru Li ◽  
Liang Huang ◽  
Chun Li ◽  
Gaoquan Shi
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Three Dimensional ◽  
Electrochemical Capacitors ◽  
Rate Capability ◽  
High Rate ◽  
Porous Graphene ◽  
Reduced Graphene ◽  
Polyaniline Composites ◽  
Porous Composites

Three-dimensional porous composites of reduced graphene oxide and polyaniline prepared by electro-codeposition exhibited much higher areal specific capacitances and greatly improved rate capability compared with those of their individual components.

High-rate capability of Na2FePO4F nanoparticles by enhancing surface carbon functionality for Na-ion batteries

2017 ◽  
Vol 5 (35) ◽  
pp. 18707-18715 ◽  
Author(s):  
Jesse S. Ko ◽  
Vicky V. T. Doan-Nguyen ◽  
Hyung-Seok Kim ◽  
Xavier Petrissans ◽  
Ryan H. DeBlock ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Rate Capability ◽  
High Rate ◽  
Charge Storage ◽  
High Rate Capability ◽  
Surface Carbon ◽  
Reduced Graphene ◽  
Kinetics Of

Na-ion charge-storage kinetics of polyol-derived Na2FePO4F are enhanced by using a nanocomposite comprising nanoparticles and reduced graphene oxide.

Simplified Synthesis of 3D Flexible Reduced Graphene Oxide-Wrapped NiCo2O4 Nanowires for High-Performance Supercapacitor

2018 ◽  
Vol 10 (3) ◽  
pp. 358-364 ◽  
Author(s):  
Chao Pan ◽  
Hongyu Sun ◽  
Jingyi Gao ◽  
Yucai Hu ◽  
Jing Wang
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Current Density ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
High Current Density ◽  
Three Dimensional ◽  
Simple Method ◽  
X Ray ◽  
Reduced Graphene

We introduced a simple method to construct novel three-dimensional (3D) flexible hierarchical nanocomposites by combining (1D) NiCo2O4 nanowires with 2D reduced graphene oxide (rGO) sheets. The hierarchical nanocomposite structure of rGO-wrapped NiCo2O4 (rGO-NiCo2O4) was confirmed by X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). The results indicated that NiCo2O4 nanowires were successfully wrapped in rGO and the morphology of the rGO-NiCo2O4 showed a three-dimensional porous structure with NiCo2O4 being homogeneously distributed in the rGO. Given their apparent advantages, these two different nanostructures were evaluated as electrodes for high-performance supercapacitors. These electrodes exhibited a high capacitance of 1824.8 F·g–1 at a current density of 0.5 A·g–1, and an excellent cycling performance extending to 5000 cycles at a high current density of 4 A·g–1. Our results clearly demonstrate that rGO sheets on NiCo2O4 nanowires can substantially improve the capacitive performance of materials and ultimately increase the cycling stability of supercapacitors. The hierarchical binary nanocomposites show excellent electrochemical properties for energy storage applications, evidencing their potential application as supercapacitors.

Li4Ti5O12/Reduced Graphene Oxide composite as a high rate capability material for lithium ion batteries

2013 ◽  
Vol 236 ◽  
pp. 30-36 ◽  
Author(s):  
Qian Zhang ◽  
Wenjie Peng ◽  
Zhixing Wang ◽  
Xinhai Li ◽  
Xunhui Xiong ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
High Rate Capability ◽  
Oxide Composite ◽  
Reduced Graphene

High-rate sodium insertion/extraction into silicon oxycarbide-reduced graphene oxide

2020 ◽  
Vol 44 (33) ◽  
pp. 14035-14040
Author(s):  
Rio Nugraha Putra ◽  
Martin Halim ◽  
Ghulam Ali ◽  
Shoyebmohamad F. Shaikh ◽  
Abdullah M. Al-Enizi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Silicon Oxycarbide ◽  
High Rate ◽  
High Rate Capability ◽  
Reduced Graphene

Silicone oxycarbide (SiOC) is gaining attention as a potential anode material for lithium-ion batteries due to its higher reversible capacity and high-rate capability.

Synthesis of hydrogenated TiO2–reduced-graphene oxide nanocomposites and their application in high rate lithium ion batteries

2014 ◽  
Vol 2 (24) ◽  
pp. 9150-9155 ◽  
Author(s):  
Jie Wang ◽  
Laifa Shen ◽  
Ping Nie ◽  
Guiyin Xu ◽  
Bing Ding ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
Capacity Retention ◽  
One Pot ◽  
Reduced Graphene

Hydrogenated TiO2–RGO nanocomposites have been synthesized via a facile one-pot hydrogenation, which exhibit superior rate capability and outstanding capacity retention.

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