scholarly journals In-Situ Synthesis of Flexible Nanocellulose/Carbon Nanotube/Polypyrrole Hydrogels for High-Performance Solid-State Supercapacitors

2021 ◽  
Author(s):  
Yang Zhan ◽  
Yang Hu ◽  
Yu Chen ◽  
Quanling Yang ◽  
Zhuqun Shi ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Solid State ◽  
Current Density ◽  
Electrode Materials ◽  
High Surface ◽  
High Surface Area ◽  
In Situ Synthesis ◽  
Composite Hydrogels ◽  
A Current

Abstract Nanocellulose has become one of the most attractive matrix materials for flexible supercapacitors, owing to the high surface area, good mechanical properties and environmental friendliness. Herein, we developed electrode materials with high capacitance and mechanical flexibility through the in-situ synthesis of polypyrrole (PPy) in TEMPO-oxidized cellulose nanofibril (TOCN)/sulfonated carbon nanotubes (SCNT) composite hydrogels. The TOCN/SCNT/PPy composite hydrogels were thus obtained via a bifunctional Fe3+ in-situ oxidation, showing high specific capacitance of 5299 mF/cm2 at a current density of 1 mA/cm2. Furthermore, the assembled symmetric TOCN-40SCNT-PPy solid-state supercapacitor exhibited outstanding capacitance of 375 mF/cm2 and electrochemical stability with 163.2% capacitance retention at a current density of 1 mA/cm2 for 2500 cycles. These nanocellulose/carbon nanotube/polypyrrole hydrogels are thus promising in the fields of flexible solid-state supercapacitor with superior electrochemical performance.

scholarly journals High Surface Area Nanoporous Graphitic Carbon Materials Derived from Lapsi Seed with Enhanced Supercapacitance

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 728 ◽  
Author(s):  
Lok Kumar Shrestha ◽  
Rekha Goswami Shrestha ◽  
Subrata Maji ◽  
Bhadra P. Pokharel ◽  
Rinita Rajbhandari ◽  
...  
Keyword(s):  
Surface Area ◽  
Current Density ◽  
Electrode Materials ◽  
Carbon Materials ◽  
High Surface ◽  
High Surface Area ◽  
Graphitic Carbon ◽  
High Rate ◽  
Surface Areas ◽  
Nanoporous Carbon Materials

Nanoporous activated carbon materials derived from agro-wastes could be suitable low-cost electrode materials for high-rate performance electrochemical supercapacitors. Here we report high surface area nanoporous carbon materials derived from Lapsi seed agro-waste prepared by zinc chloride (ZnCl2) activation at 700 °C. Powder X-ray diffraction (pXRD) and Raman scattering confirmed the amorphous structure of the resulting carboniferous materials, which also incorporate oxygen-containing functional groups as confirmed by Fourier transform infrared (FTIR) spectroscopy. Scanning and transmission electron microscopy (SEM and TEM) analyses revealed the granular, nanoporous structures of the materials. High-resolution TEM (HR-TEM) confirmed a graphitic carbon structure containing interconnected mesopores. Surface areas and pore volumes of the materials were found, respectively, in the ranges from 931 to 2272 m2 g−1 and 0.998 to 2.845 cm3 g−1, and are thus superior to commercially available activated carbons. High surface areas, large pore volumes and interconnected mesopore structures of these Lapsi seed-derived nanoporous carbon materials lead to their excellent electrochemical supercapacitance performance in aqueous electrolyte (1 M H2SO4) with a maximum specific capacitance of 284 F g−1 at a current density of 1 A g−1. Furthermore, the electrodes showed high-rate capability sustaining 67.7% capacity retention even at high current density of 20 A g−1 with excellent cycle stability achieving 99% capacitance retention even after 10,000 charge–discharge cycles demonstrating the potential of Lapsi seed derived nanoporous carbons as suitable electrode materials in high-performance supercapacitor devices.

Ex Situ and In Situ Synthesis and Characterization of Nickel Nanoparticles on High Surface Area Silica Support

2008 ◽  
Vol 14 (S2) ◽  
pp. 282-283 ◽  
Author(s):  
R Banerjee ◽  
PA Crozier
Keyword(s):  
New Mexico ◽  
Nickel Nanoparticles ◽  
High Surface ◽  
High Surface Area ◽  
In Situ Synthesis ◽  
Ex Situ ◽  
Synthesis And Characterization ◽  
Silica Support

Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008

scholarly journals Fabrication of monodisperse nitrogen-doped carbon double-shell hollow nanoparticles for supercapacitors

RSC Advances ◽  
2017 ◽  
Vol 7 (33) ◽  
pp. 20694-20699 ◽  
Author(s):  
Juyoung Yun ◽  
Jaemoon Jun ◽  
Jungsup Lee ◽  
Jaehoon Ryu ◽  
Kisu Lee ◽  
...  
Keyword(s):  
Current Density ◽  
Electrode Material ◽  
Nitrogen Doping ◽  
High Surface ◽  
High Surface Area ◽  
High Specific Capacitance ◽  
Hollow Nanoparticles ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
A Current

A supercapacitor based on nitrogen-doped carbon double shell hollow nanoparticles as the electrode material exhibited a high specific capacitance of 202 F g−1at a current density of 0.5 A g−1due to high surface area and nitrogen-doping.

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.

scholarly journals Electrochemical Performance of Cupric Oxide Loaded Carbon Nanotubes as Electrode Material for CO2 Reduction

2021 ◽  
Vol 24 (1) ◽  
pp. 9-13
Author(s):  
Sami M. Ibn Shamsah
Keyword(s):  
Current Density ◽  
Electrode Materials ◽  
Cupric Oxide ◽  
High Current Density ◽  
High Surface ◽  
Sol Gel ◽  
Minimum Energy ◽  
High Surface Area ◽  
Co2 Reduction ◽  
Linear Sweep Voltammetry

This study is conducted to explore the effective and stable electrode materials for electrochemical reduction of CO2. The different compositions (3 - 8%) CuO-supported CNT samples were prepared by a traditional sol-gel method, and the prepared materials were characterized by TGA, SEM, TEM, FTIR and XRD. The characterization results confirmed the uniform impregnation of CuO on the defects of the CNT's, which improved the utilization of meso and microporous distribution in the prepared electrocatalyst. The high surface area and stability of CuO- CNTs allowed dual conduction of electron and intermediate species with high current density at minimum energy supplied. Linear sweep voltammetry and Chronoamperometry were used to measure the electrode's current density and stability, respectively, and 8 % CuO- CNT was found most stable and progressive composition to reduce the CO2 efficiently. Further, the liquid products were analyzed using the gas chromatography, and 20 % faradic efficiency of methane was measured.

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.

Fabrication of a Novel Nanostructured SnO2/LiCoO2 Lithium-Ion Cell

MRS Advances ◽  
2016 ◽  
Vol 1 (45) ◽  
pp. 3075-3081
Author(s):  
Mark A. Poyner ◽  
Indumini Jayasekara ◽  
Dale Teeters
Keyword(s):  
Solid State ◽  
Surface Area ◽  
Electrode Materials ◽  
High Surface ◽  
High Surface Area ◽  
Lithium Ion ◽  
Anodized Aluminum ◽  
Lithium Ion Cell ◽  
Li Ion ◽  
Cell Cycling

ABSTRACTIncorporating nanotechnology processes and techniques to Li ion batteries has helped to improve the cycling capabilities and overall performance of several lithium ion battery chemistries. Nanostructuring a lithium ion battery’s anode and cathode, allows for extremely high surface area electrodes to be produced and utilized in many of these battery systems. Using a nanoporous Anodized Aluminum Oxide (AAO) membrane with nanopores of 200nm in diameter as a template, high surface area nanostructured electrode materials can be synthesized and utilized in a lithium ion cell. Through the use of RF magnetron sputter coating, these nanoporous AAO templates can be sputter coated with a thin film of active anode or cathode materials. The anode and cathode material in this research are SnO2 and LiCoO2, respectively. Nanostructured SnO2 has been investigated as an alternative high capacity anode to replace the more commonly used carbon based anodes of current lithium ion batteries. A novel nanostructured SnO2/LiCoO2 cell can be fabricated in a liquid electrolyte. The galvanostatic cell cycling performance will be discussed. Nanostructuring both electrode materials as well as the electrolyte can lead to a novel all-solid-state Li ion battery. Nanostructured SnO2 anode and LiCoO2 electrodes have been generated along with a polyethylene-oxide (PEO) based electrolyte nanoconfined in an AAO membrane, to generate a functioning nanostructured all-solid-state cell. The cell was investigated using AC impedance spectroscopy and galvanostatic cell cycling. The cycling results of both SnO2/LiCoO2 cell systems will be discussed.

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.

scholarly journals Supramolecular ionic polymer/carbon nanotube composite hydrogels with enhanced electromechanical performance

2020 ◽  
Vol 9 (1) ◽  
pp. 478-488 ◽  
Author(s):  
Yun-Fei Zhang ◽  
Fei-Peng Du ◽  
Ling Chen ◽  
Ka-Wai Yeung ◽  
Yuqing Dong ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Ion Mobility ◽  
Artificial Muscles ◽  
Ionic Polymer ◽  
Composite Hydrogels ◽  
The Matrix ◽  
Electromechanical Performance ◽  
Carbon Nanotube Composite ◽  
Robotic Devices

AbstractElectroactive hydrogels have received increasing attention due to the possibility of being used in biomimetics, such as for soft robotics and artificial muscles. However, the applications are hindered by the poor mechanical properties and slow response time. To address these issues, in this study, supramolecular ionic polymer–carbon nanotube (SIPC) composite hydrogels were fabricated via in situ free radical polymerization. The polymer matrix consisted of carbon nanotubes (CNTs), styrene sulfonic sodium (SSNa), β-cyclodextrin (β-CD)-grafted acrylamide, and ferrocene (Fc)-grafted acrylamide, with the incorporation of SSNa serving as the ionic source. On applying an external voltage, the ions accumulate on one side of the matrix, leading to localized swelling and bending of the structure. Therefore, a controllable and reversible actuation can be achieved by changing the applied voltage. The tensile strength of the SIPC was improved by over 300%, from 12 to 49 kPa, due to the reinforcement effect of the CNTs and the supramolecular host–guest interactions between the β-CD and Fc moieties. The inclusion of CNTs not only improved the tensile properties but also enhanced the ion mobility, which lead to a faster electromechanical response. The presented electro-responsive composite hydrogel shows a high potential for the development of robotic devices and soft smart components for sensing and actuating applications.

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