Ditch‐Structured Sulfur Cathode: Enhancing the Uniformity of Sulfur Redox Reaction in a Thick Sulfur Electrode

2021 ◽  
Author(s):  
Jinhong Lee ◽  
Hobeom Kwack ◽  
Min Kyung Kim ◽  
Wonhee Jo ◽  
Hyungjun Noh ◽  
...  
Keyword(s):  
Redox Reaction ◽  
Sulfur Cathode ◽  
Sulfur Electrode

Improving the electrochemical performance of a lithium–sulfur battery with a conductive polymer-coated sulfur cathode

RSC Advances ◽  
2015 ◽  
Vol 5 (55) ◽  
pp. 44160-44164 ◽  
Author(s):  
Yanrong Li ◽  
Lixia Yuan ◽  
Zhen Li ◽  
Yizi Qi ◽  
Chao Wu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Conductive Polymer ◽  
Significant Enhancement ◽  
Sulfur Cathode ◽  
Capacity Retention ◽  
Lithium Sulfur Battery ◽  
Sulfur Battery ◽  
Sulfur Electrode ◽  
Lithium Sulfur

A pristine sulfur electrode with simple PEDOT:PSS coating achieves significant enhancement in both sulfur utilization and capacity retention.

Building a cycle-stable sulphur cathode by tailoring its redox reaction into a solid-phase conversion mechanism

2018 ◽  
Vol 6 (46) ◽  
pp. 23396-23407 ◽  
Author(s):  
Feng He ◽  
Xiangjiang Wu ◽  
Jiangfeng Qian ◽  
Yuliang Cao ◽  
Hanxi Yang ◽  
...  
Keyword(s):  
Redox Reaction ◽  
Solid Phase ◽  
Phase Conversion ◽  
Sulfur Cathode ◽  
Sei Layer

A cycle-stable sulfur cathode with a solid-phase conversion mechanism is developed by building a SEI layer on S/C particles.

In situ-grown tungsten carbide nanoparticles on nanocarbon as an electrocatalyst to promote the redox reaction kinetics of high-mass loading sulfur cathode for high volumetric performance

2020 ◽  
Vol 8 (42) ◽  
pp. 22240-22250
Author(s):  
Jing Zhang ◽  
Shaorong Duan ◽  
Caiyin You ◽  
Jian Wang ◽  
Haitao Liu ◽  
...  
Keyword(s):  
Tungsten Carbide ◽  
Reaction Kinetics ◽  
Redox Reaction ◽  
High Mass ◽  
Mass Loading ◽  
Sulfur Cathode ◽  
Kinetics Of

Tungsten carbide nanoparticles are uniformly integrated with nanocarbon to boost the reaction kinetics for high volumetric performance of Li–S batteries.

Non-Cottrell Behavior of the Dopamine Redox Reaction Observed on the Carbon Fibre Microelectrode by the Double-Step Voltcoulometry

2004 ◽  
Vol 69 (2) ◽  
pp. 419-425 ◽  
Author(s):  
Katarína Gmucová ◽  
Jozef Orlický ◽  
Juraj Pavlásek
Keyword(s):  
Carbon Fibre ◽  
Redox Reaction ◽  
Measured Data ◽  
The Other ◽  
Diffusion Current ◽  
Double Step ◽  
Dopamine Concentration ◽  
Living Body ◽  
Carbon Fibre Microelectrode ◽  
Experimental Errors

The redox reaction of the neurotransmitter dopamine at the carbon fibre microelectrode was studied by several electrochemical methods. It was found that under conditions usual in a living body, the diffusion current fullfils, within experimental errors, the behavior theoretically predicted by the Cottrell equation. Nevertheless, attention should be paid to the fact that unsupported or weakly supported conditions give rise to a non-Cottrell response of diffusion current. Moreover, similar changes were observed if the dopamine concentration was either lower such as several units of μmol l-1, or about 100 μmol l-1 or higher. The non-Cottrell behavior of diffusion current involves the nonlinearity of the dopamine calibration curve obtained by pulse techniques. The present work is aimed at pointing out that such behavior of the measured data could lead to misinterpretation of the obtained dopamine concentration. Similar features could be also achieved for the other catecholamines.

Accelerated Redox Reaction of Hydrogen Peroxide by Employing Locally Concentrated State of Copper Catalysts on Polymer Chain

2021 ◽  
pp. 2100274
Author(s):  
Shigehito Osawa ◽  
Kenichi Kitanishi ◽  
Maho Kiuchi ◽  
Motoyuki Shimonaka ◽  
Hidenori Otsuka
Keyword(s):  
Hydrogen Peroxide ◽  
Polymer Chain ◽  
Redox Reaction ◽  
Copper Catalysts

scholarly journals Thermochemical Energy Storage Performance Analysis of (Fe,Co,Mn)Ox Mixed Metal Oxides

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 362
Author(s):  
Yabibal Getahun Dessie ◽  
Qi Hong ◽  
Bachirou Guene Lougou ◽  
Juqi Zhang ◽  
Boshu Jiang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Redox Reaction ◽  
Gas Flow ◽  
Oxygen Exchange ◽  
Engineering Industry ◽  
Oxide Material ◽  
Oxide Materials ◽  
Uptake Ratio

Metal oxide materials are known for their ability to store thermochemical energy through reversible redox reactions. Metal oxides provide a new category of materials with exceptional performance in terms of thermochemical energy storage, reaction stability and oxygen-exchange and uptake capabilities. However, these characteristics are predicated on the right combination of the metal oxide candidates. In this study, metal oxide materials consisting of pure oxides, like cobalt(II) oxide, manganese(II) oxide, and iron(II, III) oxide (Fe3O4), and mixed oxides, such as (100 wt.% CoO, 100 wt.% Fe3O4, 100 wt.% CoO, 25 wt.% MnO + 75 wt.% CoO, 75 wt.% MnO + 25 wt.% CoO) and 50 wt.% MnO + 50.wt.% CoO), which was subjected to a two-cycle redox reaction, was proposed. The various mixtures of metal oxide catalysts proposed were investigated through the thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), energy dispersive X-ray (EDS), and scanning electron microscopy (SEM) analyses. The effect of argon (Ar) and oxygen (O2) at different gas flow rates (20, 30, and 50 mL/min) and temperature at thermal charging step and thermal discharging step (30–1400 °C) during the redox reaction were investigated. It was revealed that on the overall, 50 wt.% MnO + 50 wt.% CoO oxide had the most stable thermal stability and oxygen exchange to uptake ratio (0.83 and 0.99 at first and second redox reaction cycles, respectively). In addition, 30 mL/min Ar–20 mL/min O2 gas flow rate further increased the proposed (Fe,Co,Mn)Ox mixed oxide catalyst’s cyclic stability and oxygen uptake ratio. SEM revealed that the proposed (Fe,Co,Mn)Ox material had a smooth surface and consisted of polygonal-shaped structures. Thus, the proposed metallic oxide material can effectively be utilized for high-density thermochemical energy storage purposes. This study is of relevance to the power engineering industry and academia.

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