Ultrathin Cu-MOF@δ-MnO2 nanosheets for aqueous electrolyte-based high-voltage electrochemical capacitors

2018 ◽  
Vol 6 (36) ◽  
pp. 17329-17336 ◽  
Author(s):  
Jing Xu ◽  
Yan Wang ◽  
Shuai Cao ◽  
Jian Zhang ◽  
Guangxun Zhang ◽  
...  
Keyword(s):  
High Voltage ◽  
Aqueous Electrolyte ◽  
Electrochemical Capacitors ◽  
Water Electrolysis ◽  
Operating Voltage ◽  
Asymmetric Supercapacitor ◽  
Mno2 Nanosheets

Ultrathin Cu-MOF@δ-MnO2 nanosheets have been successfully prepared and the operating voltage window of the asymmetric supercapacitor can reach high values in aqueous electrolyte without any water electrolysis.

Influence of aqueous electrolyte concentration on parasitic reactions in high-voltage electrochemical capacitors

2016 ◽  
Vol 5 ◽  
pp. 111-115 ◽  
Author(s):  
Minglong He ◽  
Krzysztof Fic ◽  
Elżbieta Frąckowiak ◽  
Petr Novák ◽  
Erik J. Berg
Keyword(s):  
High Voltage ◽  
Electrolyte Concentration ◽  
Aqueous Electrolyte ◽  
Electrochemical Capacitors

Effect of accelerated ageing on the performance of high voltage carbon/carbon electrochemical capacitors in salt aqueous electrolyte

2014 ◽  
Vol 130 ◽  
pp. 344-350 ◽  
Author(s):  
Paula Ratajczak ◽  
Krzysztof Jurewicz ◽  
Piotr Skowron ◽  
Qamar Abbas ◽  
François Béguin
Keyword(s):  
High Voltage ◽  
Aqueous Electrolyte ◽  
Electrochemical Capacitors ◽  
Accelerated Ageing

On the effect of the periodicity of diagnostic measurements on improving the reliability of high-voltage transformers

2019 ◽  
Vol 12 (1) ◽  
pp. 18-21
Author(s):  
V. A. Tikhonov
Keyword(s):  
Service Life ◽  
High Voltage ◽  
Chromatographic Analysis ◽  
Aluminum Industry ◽  
Early Stage ◽  
Diagnostic Methods ◽  
Transformer Oil ◽  
Operating Voltage ◽  
Dissolved Gases ◽  
The Aluminum Industry

The influence of the periodicity of diagnostic measurements on the operational state of high-voltage transformers is considered. Examples of defects of switching devices of converter transformers and methods for their detection are given. The rationale for the importance of recognition of defects at an early stage of their occurrence is given. The influence of the multiplicity of overvoltages on the service life of converter transformers in the aluminum industry is investigated. Based on the analysis of the service life of converter transformers of one of the powerful aluminum plants, where 83% of converter transformers have exhausted their standard service life, it is shown that in 40% of cases it would be possible to avoid their failures, with timely detection and elimination of emerging defects. Examples of defects of OLR (on-load regulators) of converter transformers and methods for their detection are given. The importance of recognition of defects at an early stage of their occurrence is substantiated. A method for chromatographic analysis of dissolved gases in transformer oil has been developed for the qualitative determination of defects and ways to eliminate them. Examples of diagnostics of converter transformers at operating voltage and working load are given, providing the best quality operational characteristics of converter transformers. The periodicity of diagnostic measurements and the reduction of defects and failures has been substantiated. The question of diagnosing the state of the converter transformer TDNP-40000/10 at an enterprise of the aluminum industry is investigated. Currently, diagnostic methods are being developed based on chromatographic analysis of dissolved gases in transformer oil. The presented method of evaluating the operating parameters of transformers allows for the safe operation of high-voltage transformers and enables to increase the reliability of the power supply scheme of aluminum industry plants.

Chemical etching of stainless steel 301 for improving performance of electrochemical capacitors in aqueous electrolyte

2015 ◽  
Vol 279 ◽  
pp. 555-562 ◽  
Author(s):  
P. Jeżowski ◽  
M. Nowicki ◽  
M. Grzeszkowiak ◽  
R. Czajka ◽  
F. Béguin
Keyword(s):  
Stainless Steel ◽  
Chemical Etching ◽  
Aqueous Electrolyte ◽  
Electrochemical Capacitors

scholarly journals High-Energy Density Asymmetric Supercapacitor Based on Electrospun Vanadium Pentoxide and Polyaniline Nanofibers in Aqueous Electrolyte

2012 ◽  
Vol 159 (9) ◽  
pp. A1481-A1488 ◽  
Author(s):  
Wai Fatt Mak ◽  
Grace Wee ◽  
Vanchiappan Aravindan ◽  
Nutan Gupta ◽  
Subodh G. Mhaisalkar ◽  
...  
Keyword(s):  
Energy Density ◽  
Vanadium Pentoxide ◽  
Aqueous Electrolyte ◽  
High Energy ◽  
High Energy Density ◽  
Asymmetric Supercapacitor ◽  
Polyaniline Nanofibers

High voltage asymmetric supercapacitor based on MnO2 and graphene electrodes

2013 ◽  
Vol 689 ◽  
pp. 201-206 ◽  
Author(s):  
Jianyun Cao ◽  
Yaming Wang ◽  
Yu Zhou ◽  
Jia-Hu Ouyang ◽  
Dechang Jia ◽  
...  
Keyword(s):  
High Voltage ◽  
Asymmetric Supercapacitor

High-voltage asymmetric supercapacitors operating in aqueous electrolyte

2005 ◽  
Vol 82 (4) ◽  
pp. 567-573 ◽  
Author(s):  
V. Khomenko ◽  
E. Raymundo-Piñero ◽  
E. Frackowiak ◽  
F. Béguin
Keyword(s):  
High Voltage ◽  
Aqueous Electrolyte ◽  
Asymmetric Supercapacitors
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