scholarly journals Mechanisms of charge accumulation of the electrochemical system LaMnO3 / AC

2021 ◽  
Vol 22 (4) ◽  
pp. 644-654
Author(s):  
H.M. Kolkovska ◽  
B.I. Rachiy ◽  
P.I. Kolkovskyi ◽  
I.P. Yaremiy ◽  
N.Ya. Ivanichok ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Specific Energy ◽  
Discharge Current ◽  
Specific Capacity ◽  
Electrochemical Capacitor ◽  
Lithium Sulfate ◽  
Charge Accumulation ◽  
Electrochemical System ◽  
Nanoporous Carbon Material ◽  
Perovskite Material

In this work, the electrochemical behavior of LaMnO3 perovskite material and nanoporous carbon material in an aqueous solution of lithium sulfate are studied. The regularities of the expediency of the joint functioning of these materials as electrodes for a hybrid electrochemical capacitor are determined. It was found that the value of the specific capacity of the investigated electrochemical system of LaMnO3 / electrolyte / AC is 52 F/g during the discharge of the system to 1 V and the value of specific energy is 112.1 J /g at a discharge current of 1 mA.

scholarly journals Mechanisms of charge accumulation in electrochemical systems formed based on of nanoporous carbon and manganese oxide

2020 ◽  
Vol 21 (4) ◽  
pp. 621-627
Author(s):  
P.I. Kolkovskyi ◽  
B.K. Ostafiychuk ◽  
M.I. Kolkovskyi ◽  
N.Ya. Ivanichok ◽  
S-V.S. Sklepova ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Redox Reactions ◽  
Electrode Materials ◽  
Electrochemical Capacitor ◽  
Nanoporous Carbon ◽  
Operating Voltage ◽  
Charge Accumulation ◽  
Laboratory Sample ◽  
Electrochemical Systems ◽  
Nanoporous Carbon Material

In this work, the processes occurring in electrochemical systems based on nanoporous carbon material and manganese oxide in an aqueous solution of lithium sulfate are analyzed. Furthermore, it is shows the feasibility of these materials combination cycling as electrodes of a hybrid electrochemical capacitor. The combination of electrode materials with different mechanisms of charge accumulation was determined. Consequently, an increase in the accumulated energy by more than 25% by the formation of an electric double layer and the occurrence of redox reactions based on carbon and manganese oxide respectively. The laboratory sample of an aqueous electrolyte hybrid electrochemical capacitor was formed. Moreover, the laboratory sample is electrochemically stable at an operating voltage of 2 V.

scholarly journals Morphology, Conductivity and Electrochemical Properties of Hydrothermal Carbonized Porous Carbon Materials

2016 ◽  
Vol 3 (1) ◽  
pp. 46-55
Author(s):  
N. Nagirna ◽  
V. Mandzyuk
Keyword(s):  
Electrochemical Properties ◽  
Porous Carbon ◽  
Carbon Materials ◽  
Specific Capacity ◽  
Carbonization Temperature ◽  
Electrochemical System ◽  
Plant Materials ◽  
Temperature Growth ◽  
Raw Plant Materials ◽  
Volume Decrease

The paper studies the morphology, conductivity and electrochemical properties ofcarbon materials, obtained from raw plant materials at different condition of hydrothermalcarbonization, using low-temperature porometry, impedance spectroscopy and galvanostaticcharge/discharge. It is set, that in porous structure of carbon materials micropores are dominant;when carbonization temperature increased the specific surface and pore volume decrease morethan 10 times. The temperature growth results in increasing the electrical conductivity of thecarbon material more than 6 orders. It is found, that the maximal value of specific capacity(1138 mА·h/g) has an electrochemical system based on porous carbon carbonized at 1023 K

Synthesis of a SiO2/TiO2 hybrid boronate affinity monolithic column for specific capture of glycoproteins under neutral conditions

The Analyst ◽  
2014 ◽  
Vol 139 (5) ◽  
pp. 987-991 ◽  
Author(s):  
Qin Yang ◽  
Dihui Huang ◽  
Ping Zhou
Keyword(s):  
Aqueous Solution ◽  
Monolithic Column ◽  
Specific Capacity ◽  
Neutral Ph ◽  
Neutral Conditions ◽  
Hybrid Monolithic Column

A unique boronate-functionalized SiO2/TiO2 hybrid monolithic column was synthesized by a facile approach. The monolith exhibited specific capacity to capture glycoproteins and antibodies in aqueous solution at neutral pH.

scholarly journals Estimation of the Time of Flight of an Electric Unmanned Helicopter Based on the Minimum Set of Parameters

2019 ◽  
pp. 67-72
Author(s):  
S.Z. Sverdlov
Keyword(s):  
Specific Energy ◽  
Specific Capacity ◽  
Time Of Flight ◽  
Assessment Methods ◽  
Theoretical Studies ◽  
Unmanned Helicopter ◽  
Key Factors ◽  
Factors Influencing

This article deals with the problem of forecasting the time of flight of an electric unmanned helicopter utilizing the minimum set of known parameters: the diameter and number of rotors and the flight mass. By solving this problem, it is possible to estimate the capabilities of an unmanned helicopter (multicopter), without having its full technical characteristics, which are often unavailable. In addition, when starting to design an aircraft, it is important to assess its key parameters necessary to achieve a given duration of flight, while preferably utilizing the minimum set of such parameters. Assessment methods are developed based on the statistics of the specific capacity of the batteries used for the construction of the aircraft class in question, and the analysis of the specific energy per weight, which is based both on theoretical studies and the consideration of known analogues. The obtained formulas clearly express the dependence of the time of flight on the key factors influencing it. Estimation of the time of flight using the proposed methods, may be the first step in designing a multicopter.

Simultaneous nitrification and denitrification using a polypyrrole/microbial cellulose electrode in a membraneless bio-electrochemical system

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 72699-72708 ◽  
Author(s):  
Hooshyar Hossini ◽  
Abbas Rezaee ◽  
Bita Ayati ◽  
Amir Hossein Mahvi
Keyword(s):  
Aqueous Solution ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Simultaneous Nitrification And Denitrification ◽  
Electrochemical System ◽  
Microbial Cellulose ◽  
System P ◽  
Total Nitrogen Removal ◽  
Nitrification And Denitrification ◽  
Denitrification Process

In this study, the feasibility of ammonium and total nitrogen removal from aqueous solution using a simultaneous nitrification and denitrification process was studied in a membraneless bio-electrochemical system with a novel electrode.

Self-Supported NiSe/Ni Foam: An Efficient 3D Electrode for High-Performance Supercapacitors

NANO ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. 1850136 ◽  
Author(s):  
Jingtong Zhang ◽  
Fuzhen Zhao ◽  
Kun Du ◽  
Yan Zhou
Keyword(s):  
High Performance ◽  
Nickel Foam ◽  
Specific Capacity ◽  
Three Dimensional ◽  
Electrochemical Capacitor ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Acicular Structure ◽  
Synthetic Reaction

Three-dimensional (3D) mixed phases NiSe nanoparticles growing on the nickel foam were synthesized via a simple one-step hydrothermal method. A series of experiments were carried out to control the morphology by adjusting the amount of selenium in the synthetic reaction. Meanwhile, the as-prepared novel column-acicular structure NiSe exist three advantages including ideal electrical conductivity, high specific capacity and high cycling stability. It delivered a high capacitance of 10.8[Formula: see text]F[Formula: see text]cm[Formula: see text] at a current density[Formula: see text] of 5[Formula: see text]mA[Formula: see text]cm[Formula: see text]. An electrochemical capacitor device operating at 1.6[Formula: see text]V was then constructed using NiSe/NF and activated carbon (AC) as positive and negative electrodes. Moreover, the device showed high energy density of 31[Formula: see text]W[Formula: see text]h[Formula: see text]kg[Formula: see text] at a power density of 0.81[Formula: see text]kW[Formula: see text]kg[Formula: see text], as well as good cycling stability (77% retention after 1500 cycles).

scholarly journals Electrical properties of composites based on nanoporous carbon material

2020 ◽  
Vol 21 (3) ◽  
pp. 409-414
Author(s):  
I. M. Budzulyak ◽  
P. I. Kolkovskyi ◽  
B. I. Rachiy ◽  
M. I. Kolkovskyi ◽  
S. L. Revo ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Carbon Material ◽  
Specific Capacity ◽  
Expanded Graphite ◽  
Nanoporous Carbon ◽  
Flat Band ◽  
Plant Materials ◽  
Nanoporous Carbon Material ◽  
Thermochemical Activation ◽  
Schottky Model

In this work, the morphological and electrical properties of the composite nanoporous carbon material/thermally expanded graphite or acetylene black have been investigated. Nanoporous carbon material was obtained from plant materials by its thermochemical activation based on potassium hydroxide. The dependence of the specific capacity of the nanoporous carbon/electrolyte electrochemical system on the applied potential was determined by the impedance spectroscopy method. Furthermore, the concentration of charge transfer and the density of states, as well as the flat-band potential of the system under research, were determined based on the Mott-Schottky model.

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