Ultrafast Microwave Synthesis of Activated Carbon from Enteromorpha prolifera and Its Electrochemical Capacitive Behavior

AbstractIn this study, we investigated that the activated carbon (AC)-based supercapacitor and introduced SIFSIX-3-Ni as a porous conducting additive to increase its electrochemical performances of AC/SIFSIX-3-Ni composite-based supercapacitor. The AC/SIFSIX-3-Ni composites are coated onto the aluminum substrate using the doctor blade method and conducted an ion-gel electrolyte to produce a symmetrical supercapacitor. The electrochemical properties of the AC/SIFSIX-3-Ni composite-based supercapacitor are evaluated through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge tests (GCD). The AC/SIFSIX-3-Ni composite-based supercapacitor showed reasonable capacitive behavior in various electrochemical measurements, including CV, EIS, and GCD. The highest specific capacitance of the AC/SIFSIX-3-Ni composite-based supercapacitor was 129 F g−1 at 20 mV s−1.

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Improved Capacitive Behavior of Birnessite Type Mn Oxide Coated on Activated Carbon Fibers

Journal of The Electrochemical Society ◽

10.1149/1945-7111/ac436d ◽

2021 ◽

Author(s):

Zahra Abedi ◽

Desiree Leistenschneider ◽

Douglas Ivey ◽

Weixing Chen

Keyword(s):

Activated Carbon ◽

Carbon Fibers ◽

Hydrothermal Process ◽

Total Pore Volume ◽

Annealing Process ◽

Activated Carbon Fibers ◽

Capacitive Behavior ◽

Mn Oxide ◽

Reducing Environment

Abstract Birnessite type Mn oxide (potassium birnessite hydrate) powder (as-δ-MnO2) with a layered microstructure was prepared via a hydrothermal process. To improve its capacitive performance, the microstructure was thermally modified (annealed) at 400 oC (400-δ-MnO2) in a N2 reducing environment. By removing the hydrated cations (K+) layers inserted between the main layers of birnessite, damaging the microstructure, intercalation/deintercalation of the electrolyte species (Li+1) became more effective. Characterization of as-δ-MnO2 and 400-δ-MnO2 revealed that no phase transformation occurred during the annealing process. The microstructure became less crystalline and the total pore volume increased from 0.20 cm3 g-1 to 0.43 cm3 g-1, while the oxidation state of Mn remained 4+ after annealing the as-δ-MnO2 at 400 oC. The 400-δ-MnO2 sample was then coated on asphaltene derived activated carbon fibers (ACF-400-δ-MnO2) to improve the performance by making use of the high electrical conductivity and capacitive behavior of ACF. Coating the 400-δ-MnO2 sample led to a significant increase in the capacitance (328 F g-1 and 195 F g-1 for ACF-400-δ-MnO2 and 400-δ-MnO2 at 0.4 A g-1, respectively), improved energy and power values (~7 kW kg-1 at ~4.2 Wh kg-1 for ACF-400-δ-MnO2 and 240 W kg-1 at 2.4 Wh kg-1 for 400-δ-MnO2) and improved cycling behavior.

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Microwave synthesis of hierarchically porous activated carbon from lignite for high performance supercapacitors

Journal of Porous Materials ◽

10.1007/s10934-015-0056-0 ◽

2015 ◽

Vol 23 (1) ◽

pp. 67-73 ◽

Cited By ~ 16

Author(s):

Baolin Xing ◽

Guangxu Huang ◽

Lunjian Chen ◽

Hui Guo ◽

Chuanxiang Zhang ◽

...

Keyword(s):

Activated Carbon ◽

Microwave Synthesis ◽

High Performance ◽

Hierarchically Porous ◽

Porous Activated Carbon

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Nitrogen Tailored Activated Carbon via Microwave Synthesis Method for High Removal of Hydrogen Sulfide

Malaysian Journal of Fundamental and Applied Sciences ◽

10.11113/mjfas.v17n6.2319 ◽

2021 ◽

Vol 17 (6) ◽

pp. 794-604

Author(s):

Norhusna Mohamad Nor ◽

Lau Lee Chung ◽

Abdul Rahman Mohamed

Keyword(s):

Heat Treatment ◽

Hydrogen Sulfide ◽

Activated Carbon ◽

Microwave Irradiation ◽

Microwave Synthesis ◽

Synthesis Method ◽

Impregnation Method ◽

Palm Shell

In this work, commercialized palm shell activated carbon was modified into nitrogen-functionalized carbon via urea impregnation method, followed by heat treatment via microwave irradiation at 950 °C.

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