scholarly journals Conductive Fe@Fe2O3/FeOOH necklace-like nanowires of high electrochemical performances for a supercapacitor application

2022 ◽  
Vol 145 ◽  
pp. 111549
Author(s):  
Wei Pan ◽  
Mu Zhang ◽  
Fangqi Gui ◽  
Yidong Han ◽  
Xudong Sun
Keyword(s):  
Electrochemical Performances ◽  
Supercapacitor Application

scholarly journals Research Progress of NiMn Layered Double Hydroxides for Supercapacitors: A Review

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 747 ◽  
Author(s):  
Ai-Lan Yan ◽  
Xin-Chang Wang ◽  
Ji-Peng Cheng
Keyword(s):  
Layered Double Hydroxides ◽  
Electrode Materials ◽  
Low Cost ◽  
Specific Capacity ◽  
Research Progress ◽  
Electrochemical Performances ◽  
Preparation Methods ◽  
Large Power ◽  
Supercapacitor Application ◽  
Double Hydroxides

The research on supercapacitors has been attractive due to their large power density, fast charge/discharge speed and long lifespan. The electrode materials for supercapacitors are thus intensively investigated to improve the electrochemical performances. Various transition metal layered double hydroxides (LDHs) with a hydrotalcite-like structure have been developed to be promising electrode materials. Earth-abundant metal hydroxides are very suitable electrode materials due to the low cost and high specific capacity. This is a review paper on NiMn LDHs for supercapacitor application. We focus particularly on the recent published papers using NiMn LDHs as electrode materials for supercapacitors. The preparation methods for NiMn LDHs are introduced first. Then, the structural design and chemical modification of NiMn LDH materials, as well as the composites and films derived from NiMn LDHs are discussed. These approaches are proven to be effective to enhance the performance of supercapacitor. Finally, the reports related to NiMn LDH-based asymmetric supercapacitors are summarized. A brief discussion of the future development of NiMn LDHs is also provided.

Temperature Controlled Synthesis of Ce–MnO2 Nanostructure: Promising Electrode Material for Supercapacitor Applications

2020 ◽  
Vol 12 (4) ◽  
pp. 461-469 ◽  
Author(s):  
Rajesh Rajagopal ◽  
Kwang-Sun Ryu
Keyword(s):  
Electrode Material ◽  
Electrochemical Impedance ◽  
High Specific Capacitance ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
Supercapacitor Application ◽  
Structural Details ◽  
Different Temperatures ◽  
Microscope Technique ◽  
Supercapacitor Applications

The objective of this study was to prepare Ce–MnO2 nanostructure composite as an electrode material for supercapacitor application. Ce–MnO2 nanostructure composite was synthesized by facile hydrothermal method at different temperatures. Structural details of pure and Ce–MnO2 nanostructure composite were studied using powder X-ray diffraction technique. The formation of flower like structure and strong interaction with Ce and MnO2 were confirmed by field emission electron microscope technique. Their electrochemical performances were elucidated by using cyclic voltammetry, charge–discharge, and electrochemical impedance spectroscopy techniques. Nearly rectangular shaped cyclic voltagram was observed for synthesized Ce–MnO2 nanostructure composite electrode, indicating the existence of electric double layer capacitance nature. Ce–MnO2 (130) nanostructure composite exhibited high specific capacitance value of 147.25 F/g at applied current density of 1 A/g in 1 M Li2SO4 aqueous electrolyte. Furthermore, resistive and capacitive behaviors of these electrodes were studied from Nyquist and bode diagrams within frequency range of 10 mHz to 100 kHz.

scholarly journals Nanocellulose/polypyrrole aerogel electrodes with higher conductivity via adding vapor grown nano-carbon fibers as conducting networks for supercapacitor application

RSC Advances ◽  
2018 ◽  
Vol 8 (70) ◽  
pp. 39918-39928 ◽  
Author(s):  
Yanping Chen ◽  
Shaoyi Lyu ◽  
Shenjie Han ◽  
Zhilin Chen ◽  
Wenjun Wang ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
Electrode Materials ◽  
Electrochemical Performances ◽  
Supercapacitor Application ◽  
Conducting Networks ◽  
Nano Carbon

The electrochemical performances of nanocellulose-based electrode materials were improved via building nano-carbon conducting networks.

scholarly journals Ex Situ Fabrication of Polypyrrole-Coated Core-Shell Nanoparticles for High-Performance Coin Cell Supercapacitor

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 726 ◽  
Author(s):  
Hoseong Han ◽  
Sunghun Cho
Keyword(s):  
Thin Film ◽  
Electrode Materials ◽  
Solution Process ◽  
Ex Situ ◽  
Core Shell ◽  
Electrochemical Performances ◽  
Shell Nanoparticles ◽  
Supercapacitor Application ◽  
Coin Cell ◽  
Thin Film Electrodes

Silica-conducting polymer (SiO2-CP) has the advantages of high electrical conductivity, structural stability, and the facile formation of thin-film. This work deals with the preparation and optimization of polypyrrole (PPy)-encapsulated silica nanoparticles (SiO2 NPs) using an ex situ method. The SiO2-PPy core-shell NPs prepared by the ex situ method are well dispersed in water and facilitate the mass production of thin-film electrodes with improved electrical and electrochemical performances using a simple solution process. As-prepared SiO2-PPy core-shell NPs with different particle sizes were applied to electrode materials for two-electrode supercapacitors based on coin cell batteries. It was confirmed that the areal capacitance (73.1 mF/cm2), volumetric capacitance (243.5 F/cm3), and cycling stability (88.9% after 5000 cycles) of the coin cell employing the ex situ core-shell was superior to that of the conventional core-shell (4.2 mF/cm2, 14.2 mF/cm3, and 82.2%). Considering these facts, the ex situ method provides a facile way to produce highly-conductive thin-film electrodes with enhanced electrical and electrochemical properties for the coin cell supercapacitor application.

Phosphorus- and nitrogen-co-doped particleboard based activated carbon in supercapacitor application

RSC Advances ◽  
2015 ◽  
Vol 5 (21) ◽  
pp. 16433-16438 ◽  
Author(s):  
T. X. Shang ◽  
X. X. Cai ◽  
X. J. Jin
Keyword(s):  
Activated Carbon ◽  
Surface Group ◽  
Electrochemical Performances ◽  
Supercapacitor Application ◽  
Co Doping ◽  
Co Doped

The improvement of electrochemical performances mainly due to the effect of pseudocapacitance that originated from rich and tunable surface group by co-doping of phosphorus and nitrogen.

Separator modified by Ketjen black for enhanced electrochemical performance of lithium–sulfur batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (17) ◽  
pp. 13680-13685 ◽  
Author(s):  
Di Zhao ◽  
Xinye Qian ◽  
Lina Jin ◽  
Xiaolong Yang ◽  
Shanwen Wang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Cathode Side ◽  
Electrochemical Performances ◽  
Lithium Sulfur Batteries ◽  
Enhanced Electrochemical Performance ◽  
Lithium Sulfur

A routine separator modified by a Ketjen black (KB) layer on the cathode side has been investigated to improve the electrochemical performances of Li–S batteries.

scholarly journals High-Mass Loading Hierarchically Porous Activated Carbon Electrode for Pouch-Type Supercapacitors with Propylene Carbonate-Based Electrolyte

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 785
Author(s):  
Tai-Feng Hung ◽  
Tzu-Hsien Hsieh ◽  
Feng-Shun Tseng ◽  
Lu-Yu Wang ◽  
Chang-Chung Yang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Propylene Carbonate ◽  
Rational Design ◽  
Rate Capability ◽  
High Mass ◽  
Electrochemical Performances ◽  
Mass Loading ◽  
Hierarchically Porous ◽  
Symmetric Supercapacitor ◽  
Porous Activated Carbon

Rational design and development of the electrodes with high-mass loading yet maintaining the excellent electrochemical properties are significant for a variety of electrochemical energy storage applications. In comparison with the slurry-casted electrode, herein, a hierarchically porous activated carbon (HPAC) electrode with higher mass loading (8.3 ± 0.2 mg/cm2) is successfully prepared. The pouch-type symmetric device (1 cell) with the propylene carbonate-based electrolyte shows the rate capability (7.1 F at 1 mA/cm2 and 4.8 F at 10 mA/cm2) and the cycling stability (83% at 12,000 cycles). On the other hand, an initial discharge capacitance of 32.4 F and the capacitance retention of 96% after 30,000 cycles are delivered from a pouch-type symmetric supercapacitor (five cells). The corresponding electrochemical performances are attributed to the fascinating properties of the HPAC and the synergistic features of the resulting electrode.

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