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 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.

Synthesis and Characterization of Manganese Oxide/CNTs Composites as Electrochemical Capacitor Electrode Materials

2012 ◽  
Vol 519 ◽  
pp. 197-200
Author(s):  
Ye Yan ◽  
Ji Zhao Zou ◽  
Xie Rong Zeng
Keyword(s):  
Crystal Structure ◽  
Manganese Oxide ◽  
Electrode Materials ◽  
Synthesis Method ◽  
Electrochemical Capacitor ◽  
Cycling Performance ◽  
Synthesis And Characterization ◽  
Heating Equipment ◽  
Microwave Assisted

Manganese oxide (MnO2)/Carbon nanotubes(CNTs) composites were prepared by a home-made microwave heating equipment. The crystal structure, microstructure, electrochemical properties were characterized by XRD and SEM, the discharge capacity and cycling performance were compared. The results show a birnessite-type MnO2 coating can be prepared. In this paper, a microwave-assisted hydrothermal synthesis method was used to synthesize the MnO2/CNTs composites. MnO2 content increases with the increasing of microwave power, which result in the specific capacitances of as-perpared materials increase

scholarly journals Electrochemical Properties of Nanoporous Carbon Material in K+ -containing Aqueous Electrolytes

2015 ◽  
Vol 16 (2) ◽  
pp. 341-346
Author(s):  
I.M. Budzulyak ◽  
R.P. Lisovskiy ◽  
V.M. Vashchynsky ◽  
B.I. Rachiy ◽  
N.Ya. Ivanichok
Keyword(s):  
Carbon Material ◽  
Potassium Hydroxide ◽  
Nanoporous Carbon ◽  
Optimal Choice ◽  
Thermal Method ◽  
Charge Accumulation ◽  
Material Optimization ◽  
Morphological Studies ◽  
Nanoporous Carbon Material ◽  
Current Densities

The work is devoted to the study of the behavior of electrochemical systems in K+ - containing solvents. As the electrode material nanoporous carbon material was used, obtained by carbonization of plant material. Optimization of the pore size distribution was carried out with chemical-thermal method using potassium hydroxide as an activator. Parameters of supercapacitors were studied on a set AUTOLAB PGSTAT 12 using software GPES and FRA-2. Structural and morphological studies were conducted on the scanning electron microscope JSM-6700F.It is shown that the resulting materials have high values of capacity, which is realized by charge accumulation on the electrical double layer and through pseudo accumulation of ions on the surface of the material. It was established that the electrochemical capacitors based on NVM are stable over the entire range current densities, and the capacity of the material essentially depends on the optimal choice of the electrolyte.

High-energy and high-power Li-rich nickel manganese oxide electrode materials

2010 ◽  
Vol 12 (11) ◽  
pp. 1618-1621 ◽  
Author(s):  
Donghan Kim ◽  
Sun-Ho Kang ◽  
Mahalingam Balasubramanian ◽  
Christopher S. Johnson
Keyword(s):  
Manganese Oxide ◽  
High Power ◽  
Electrode Materials ◽  
High Energy ◽  
Oxide Electrode ◽  
Nickel Manganese

scholarly journals One-Step Preparation of Biochar Electrodes and Their Applications in Sediment Microbial Electrochemical Systems

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 508
Author(s):  
Kui You ◽  
Zihan Zhou ◽  
Chao Gao ◽  
Qiao Yang
Keyword(s):  
Output Power ◽  
Electrode Materials ◽  
Maximum Output Power ◽  
Composite Cathode ◽  
Maximum Output ◽  
Electrochemical Systems ◽  
Composite Cathodes ◽  
One Step ◽  
Microbial Electrochemical Systems ◽  
Hot Melt

Biochar is a kind of carbon-rich material formed by pyrolysis of biomass at high temperature in the absence or limitation of oxygen. It has abundant pore structure and a large surface area, which could be considered the beneficial characteristics for electrodes of microbial electrochemical systems. In this study, reed was used as the raw material of biochar and six biochar-based electrode materials were obtained by three methods, including one-step biochar cathodes (BC 800 and BC 700), biochar/polyethylene composite cathodes (BP 5:5 and BP 6:4), and biochar/polyaniline/hot-melt adhesive composite cathode (BPP 5:1:4 and BPP 4:1:5). The basic physical properties and electrochemical properties of the self-made biochar electrode materials were characterized. Selected biochar-based electrode materials were used as the cathode of sediment microbial electrochemical reactors. The reactor with pure biochar electrode (BC 800) achieves a maximum output power density of 9.15 ± 0.02 mW/m2, which increases the output power by nearly 80% compared with carbon felt. When using a biochar/polyaniline/hot-melt adhesive (BPP 5:1:4) composite cathode, the output power was increased by 2.33 times. Under the premise of ensuring the molding of the material, the higher the content of biochar, the better the electrochemical performance of the electrodes. The treatment of reed powder before pyrolysis is an important factor for the molding of biochar. The one-step molding biochar cathode had satisfactory performance in sediment microbial electrochemical systems. By exploring the biochar-based electrode, waste biomass could be reused, which is beneficial for the environment.

scholarly journals Synthesis of a hierarchical nanoporous carbon material with controllable pore size and effective surface area for high-performance electrochemical capacitors

RSC Advances ◽  
2017 ◽  
Vol 7 (24) ◽  
pp. 14516-14527 ◽  
Author(s):  
Bing Hu ◽  
Ling-Bin Kong ◽  
Long Kang ◽  
Kun Yan ◽  
Tong Zhang ◽  
...  
Keyword(s):  
Pore Size ◽  
Linear Relationship ◽  
Specific Capacitance ◽  
Surface Area ◽  
Carbon Material ◽  
High Performance ◽  
Electrode Materials ◽  
Effective Surface Area ◽  
Effective Surface ◽  
Nanoporous Carbon Material

There is an excellent linear relationship between E-SSA and specific capacitance of HNC-IPNs as electrode materials for EDLCs.

scholarly journals Microbial Electrochemical Systems: Principles, Construction and Biosensing Applications

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1279
Author(s):  
Rabeay Y.A. Hassan ◽  
Ferdinando Febbraio ◽  
Silvana Andreescu
Keyword(s):  
Electrode Materials ◽  
Electrical Power ◽  
Chemical Energy ◽  
Practical Implementation ◽  
Development Status ◽  
Electrochemical Systems ◽  
Recent Developments ◽  
Energy Environment ◽  
Microbial Electrochemical Systems ◽  
Selection Of

Microbial electrochemical systems are a fast emerging technology that use microorganisms to harvest the chemical energy from bioorganic materials to produce electrical power. Due to their flexibility and the wide variety of materials that can be used as a source, these devices show promise for applications in many fields including energy, environment and sensing. Microbial electrochemical systems rely on the integration of microbial cells, bioelectrochemistry, material science and electrochemical technologies to achieve effective conversion of the chemical energy stored in organic materials into electrical power. Therefore, the interaction between microorganisms and electrodes and their operation at physiological important potentials are critical for their development. This article provides an overview of the principles and applications of microbial electrochemical systems, their development status and potential for implementation in the biosensing field. It also provides a discussion of the recent developments in the selection of electrode materials to improve electron transfer using nanomaterials along with challenges for achieving practical implementation, and examples of applications in the biosensing field.

scholarly journals High-performance symmetric electrochemical capacitor based on graphene foam and nanostructured manganese oxide

AIP Advances ◽  
2013 ◽  
Vol 3 (8) ◽  
pp. 082118 ◽  
Author(s):  
Abdulhakeem Bello ◽  
Omobosede O. Fashedemi ◽  
Joel N. Lekitima ◽  
Mopeli Fabiane ◽  
David Dodoo-Arhin ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
High Performance ◽  
Electrochemical Capacitor ◽  
Graphene Foam

The preparations of nanoporous carbon with multi-heteroatoms co-doping from black liquor powders for supercapacitors

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Pengfei Hao ◽  
Yanjie Yi ◽  
Youming Li ◽  
Yi Hou
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Black Liquor ◽  
Nanoporous Carbon ◽  
Electrode System ◽  
Industrial Wastes ◽  
Co Doping ◽  
Paper Making ◽  
Symmetric Supercapacitor

Abstract A green and economically viable route without any additional activation agents and templates has been developed to synthesize biomass-derived nanoporous carbon for superior electric double-layer capacitors via direct pyrolysis of dried black liquor powders, which is the main waste in pulping and paper-making industry. The resulting carbon materials present hierarchical porosity and moderate specific surface area of 1134  m 2 g − 1 {\text{m}^{2}}\hspace{0.1667em}{\text{g}^{-1}} , as well as multi-heteroatoms co-doping such as N, S, Na and K, which exist originally in black liquor. When evaluated as electrode materials for supercapacitors in 6 M KOH aqueous electrolyte, the-prepared carbon samples deliver a significantly high gravimetric capacitance of 331  F g − 1 \text{F}\hspace{0.1667em}{\text{g}^{-1}} at 0.5  A g − 1 \text{A}\hspace{0.1667em}{\text{g}^{-1}} in a three-electrode system. Moreover, the fabricated symmetric supercapacitor also possesses a gravimetric capacitance of 211  F g − 1 \text{F}\hspace{0.1667em}{\text{g}^{-1}} at 0.5  A g − 1 \text{A}\hspace{0.1667em}{\text{g}^{-1}} , with an impressive long-term cycling stability of 92 % capacitance retention after 3000 cycles. This work explores a suitable and scalable approach for mass production of high-performance electrode materials with industrial wastes on the base of cost-efficiency and environment-friendship.

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