scholarly journals Synthesis and Electrochemical Characterization of Mesoporous MnO2

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Jia Chang Zhao ◽  
Jun Wang ◽  
Jing Li Xu
Keyword(s):  
Crystal Structure ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Material ◽  
Silica Sol ◽  
Template Method ◽  
Scan Rate ◽  
Activated Surface

The pore, crystal structure, and electrochemical performance of mesoporous MnO2prepared by silica sol template method as electrode material for supercapacitor were investigated in this work. It is found that the crystal structure of nonporous and mesoporous MnO2is confirmed to beβ-MnO2and the crystallinity of mesoporous MnO2decreases due to the formation of mesopore. The results of electrochemical performance show that the specific capacitances of the sample prepared by using 20 g of Mn(NO3)2solution and 40 g of silica sol (named MMO-4) at the scan rate of 5 mV/s are the highest (163.2 F/g), in comparison with 19.3 F/g of that of the sample of blank, suggesting the important role of pore-forming using silica sol as template. As the potential scan rate is raised to 200 mV/s, the specific capacitances of the sample of blank and MMO-4 are 12.2 F/g and 21.6 F/g, respectively. The great improvement of specific capacitance is probably due to the enlarged activated surface area after template is added.

Poly(aniline-co-pyrrole)-coated Ni-doped manganese dioxide as electrode materials for supercapacitors

2020 ◽  
Vol 13 (02) ◽  
pp. 2051007
Author(s):  
Jie Dong ◽  
Qinghao Yang ◽  
Qiuli Zhao ◽  
Zhenzhong Hou ◽  
Yue Zhou ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Cycle Stability ◽  
Mass Ratio ◽  
Scan Rate ◽  
Poly Aniline ◽  
Inorganic And Organic

Electrode materials with a high specific capacitance, outstanding reversibility and excellent cycle stability are constantly pursued for supercapacitors. In this paper, we present an approach to improve the electrochemical performance by combining the advantages of both inorganic and organic. Ni-MnO2/PANi-co-PPy composites are synthesized, with the copolymer of aniline/pyrrole being coated on the surface of Ni-doped manganese dioxide nanospheres. The inorganic–organic composite enables a substantial increase in its specific capacitance and cycle stability. When the mass ratio of Ni-MnO2 to aniline and pyrrole mixed monomer is 1:5, the composite delivers high specific capacitance of 445.49[Formula: see text]F/g at a scan rate of 2[Formula: see text]mV/s and excellent cycle stability of 61.65% retention after 5000 cycles. The results indicate that the Ni-MnO2/PANi-co-PPy composites are promising electrode materials for future supercapacitors application.

scholarly journals Fabrication of Hierarchical NiMoO4/NiMoO4 Nanoflowers on Highly Conductive Flexible Nickel Foam Substrate as a Capacitive Electrode Material for Supercapacitors with Enhanced Electrochemical Performance

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1143 ◽  
Author(s):  
Anil Yedluri ◽  
Tarugu Anitha ◽  
Hee-Je Kim
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Material ◽  
High Performance ◽  
Nickel Foam ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Charge Discharge

Hierarchical NiMoO4/NiMoO4 nanoflowers were fabricated on highly conductive flexible nickel foam (NF) substrates using a facile hydrothermal method to achieve rapid charge-discharge ability, high energy density, long cycling lifespan, and higher flexibility for high-performance supercapacitor electrode materials. The synthesized composite electrode material, NF/NiMoO4/NiMoO4 with a nanoball-like NF/NiMoO4 structure on a NiMoO4 surface over a NF substrate, formed a three-dimensional interconnected porous network for high-performance electrodes. The novel NF/NiMoO4/NiMoO4 nanoflowers not only enhanced the large surface area and increased the electrochemical activity, but also provided an enhanced rapid ion diffusion path and reduced the charge transfer resistance of the entire electrode effectively. The NF/NiMoO4/NiMoO4 composite exhibited significantly improved supercapacitor performance in terms of a sustained cycling life, high specific capacitance, rapid charge-discharge capability, high energy density, and good rate capability. Electrochemical analysis of the NF/NiMoO4/NiMoO4 nanoflowers fabricated on the NF substrate revealed ultra-high electrochemical performance with a high specific capacitance of 2121 F g−1 at 12 mA g−1 in a 3 M KOH electrolyte and 98.7% capacitance retention after 3000 cycles at 14 mA g−1. This performance was superior to the NF/NiMoO4 nanoball electrode (1672 F g−1 at 12 mA g−1 and capacitance retention 93.4% cycles). Most importantly, the SC (NF/NiMoO4/NiMoO4) device displayed a maximum energy density of 47.13 W h kg−1, which was significantly higher than that of NF/NiMoO4 (37.1 W h kg−1). Overall, the NF/NiMoO4/NiMoO4 composite is a suitable material for supercapacitor applications.

Ultrathin Nanosheets-Assembled Nickel-Based Metal-Organic Framework Microflowers for Supercapacitor Application

2022 ◽  
Author(s):  
Chong-Huan Wang ◽  
Da-Wei Zhang ◽  
Shude Liu ◽  
Yusuke Yamauchi ◽  
Fei-Bao Zhang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Material ◽  
Metal Organic Framework ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Supercapacitor Application ◽  
Ultrathin Nanosheets ◽  
Metal Organic ◽  
Organic Framework

Herein, we propose a solvent-assisted approach for preparing Ni-MOF microflowers with high specific capacitance and excellent rate capability as an electrode material for supercapacitors. Such high electrochemical performance is attributed...

One-step synthesis and electrochemical performance of a PbMoO4/CdMoO4 composite as an electrode material for high-performance supercapacitor applications

2019 ◽  
Vol 48 (28) ◽  
pp. 10652-10660 ◽  
Author(s):  
Tarugu Anitha ◽  
Araveeti Eswar Reddy ◽  
Yedluri Anil Kumar ◽  
Young-Rae Cho ◽  
Hee-Je Kim
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Material ◽  
High Performance ◽  
Cycling Stability ◽  
One Step ◽  
Supercapacitor Applications

A bunch of PbMoO4/CdMoO4 nanocube-like structures exhibit superior specific capacitance and cycling stability to PbMoO4 and CdMoO4 electrodes.

Low temperature synthesis of high electrochemical performance Co3O4 nanoparticles for application in supercapacitor

2014 ◽  
Vol 07 (01) ◽  
pp. 1450002 ◽  
Author(s):  
Hongtao Cui ◽  
Minmin Wang ◽  
Wanzhong Ren ◽  
Yunan Zhao
Keyword(s):  
Low Temperature ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
High Performance ◽  
Large Scale ◽  
Co3o4 Nanoparticles ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Full Contact ◽  
Scan Rate

Nonaggregate and well-crystallized Co 3 O 4 nanoparticles with size of 5–15 nm were prepared on a large scale at low temperature by an epoxide precipitation route. The preparation of Co 3 O 4 nanoparticles followed the steps of α- Co ( OH )2 formation through epoxide precipitation reactions, conversion of α- Co ( OH )2 to CoOOH in ammonia regulated alkaline suspension, and transformation of CoOOH to Co 3 O 4 at 100°C. The small size and nonaggregate state of obtained Co 3 O 4 nanoparticles guaranteed the full contact of Co 3 O 4 nanoparticles with electrolyte and the complete penetration of electrolyte into the particles. Consequently, the Co 3 O 4 nanoparticles presented specific capacitance as high as 879.5 F g-1 at scan rate of 5 mV s-1 in 1 KOH . Their specific capacitance remain 82.8% of the initial specific capacitance after 5000 charge and discharge cycles. These results demonstrated that these Co 3 O 4 nanoparticles can be applied as a high performance electrode material for supercapacitor.

Electrochemical performance of l-tryptophanium picrate as an efficient electrode material for supercapacitor application

2019 ◽  
Vol 21 (22) ◽  
pp. 11829-11838 ◽  
Author(s):  
Rajkumar Srinivasan ◽  
Elanthamilan Elaiyappillai ◽  
S. Gowri ◽  
A. Bella ◽  
A. Sathiyan ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Material ◽  
Supercapacitor Application

l-Tryptophanium picrate was synthesized and evaluated for its supercapacitor behavior and a 263 F g−1 specific capacitance was achieved.

scholarly journals Insights into Gasdermin D activation from the crystal structure of its C-terminal domain

2017 ◽  
Author(s):  
Leonie Anton ◽  
Lorenzo Sborgi ◽  
Sebastian Hiller ◽  
Petr Broz ◽  
Timm Maier
Keyword(s):  
Crystal Structure ◽  
Cell Death ◽  
Plasma Membrane ◽  
Biochemical Characterization ◽  
Terminal Domain ◽  
Surface Patches ◽  
Activation Pathways ◽  
Interdomain Interactions

AbstractGasdermin D (GSDMD) is the central executioner of pyroptosis, a proinflammatory type of cell death. GSDMD is activated by the proinflammatory caspase-1 and caspase-11 via proteolytic cleavage in the linker connecting its N-terminal and C-terminal domain (GSDMDNterm, Cterm). The released N-terminal domain is sufficient to form pores in the plasma membrane, resulting in swelling and subsequent rupture of the cell. Here, we report the crystal structure of the autoinhibitory C-terminal domain of GSDMD at 2.04 Å resolution to further analyse determinants of GSDMD activation. GSDMDCterm adopts a compact helical fold unique to gasdermin proteins. Structural analysis and comparison to other gasdermin proteins reveals a conserved key interface for interactions between GSDMDNterm and GSDMDCterm. Variations in two additional surface patches involved in interdomain interactions in full-length gasdermins suggest a role of these regions in modulating activation pathways, in agreement with biochemical characterization of different gasdermins.

scholarly journals From flax fibers to activated carbon electrodes: The role of fiber refining

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 1296-1310
Author(s):  
Hongwei Li ◽  
Yucheng Feng ◽  
Lvqiao Tang ◽  
Fei Yang
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
Electrode Material ◽  
High Current Density ◽  
High Specific Surface Area ◽  
Pulp Fibers ◽  
Flax Fibers ◽  
Synergistic Activation ◽  
Porous Microstructure

Flax-based activated porous carbon materials (APCs) were prepared via KOH and urea synergistic activation in the carbonization process using flax pulp as a biocompatible and eco-friendly biomass precursor. A refining process was used to pretreat the flax pulp fibers, which has been known to improve and optimize the performance of APCs. The morphological and physicochemical structures of APCs were investigated, and the results showed that APCs exhibited high specific surface area and porous microstructure. Furthermore, APCs were rationally designed as a sustainable electrode material. The APC prepared by 60 °SR (Shopper-Riegler beating degree) flax pulp, named APC-60, exhibited the highest specific capacitance of 265.8 F/g at a current density of 0.5 A/g. The specific capacitance retention at 59% remained for the APC-60 electrodes at a high current density of 10 A/g. These results suggested that the flax-based APCs could be a promising carbon-based electrode material for sustainable electrochemical energy storage.

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