Asymmetric supercapacitors based on biomass-derived porous activated carbon (PAC)/1D manganese oxide (MnO2) electrodes with high power and energy densities
- Authors
- Lee, Young-Seok; Selvaraj, Aravindha Raja; Kostoglou, Nikolaos; Rebholz, Claus; Rajendiran, Rajmohan; Raman, Vivekanandan; Kim, Heeje; Rajesh, John Anthuvan; Nagulapati, Vijay Mohan; Oh, Tae Hwan; Jerome, Peter; Kim, Sung-Shin
- Issue Date
- Jun-2024
- Publisher
- ELSEVIER
- Keywords
- Biomass derived hierarchically porous carbon; 1D beta-MnO 2 nanorods; Pseudo capacitance; Asymmetric capacitors
- Citation
- MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS, v.304
- Journal Title
- MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
- Volume
- 304
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/91753
- DOI
- 10.1016/j.mseb.2024.117368
- ISSN
- 0921-5107
1873-4944
- Abstract
- In this study, we present the electrochemical performance of an asymmetric supercapacitor (ASC) composed of one-dimensional manganese oxide (MnO2) nanorods embedded in porous activated carbon sheets (MnO2/PAC) as the positive electrode (positrode), and renewable porous activated carbon (PAC) as the negative electrode (negatrode). This configuration facilitates a high rate of charge/discharge while maintaining substantial specific capacity. The MnO2/PAC composite was successfully synthesized using a hydrothermal technique, while the PAC material was produced through pyrolysis reaction. The MnO2/PAC composite exhibited a maximum specific capacitance of 208.75F g-1 at 0.5 A/g and demonstrated a cyclic stability of 87.43 % in neutral aqueous electrolytes. This notable electrochemical performance is attributed to the significant contribution of the high pseudo-capacitance offered by dense MnO2 nanorods, in addition to the expansive surface area of the activated carbon sheets with closely packed structures. The ASC constructed as PAC//MnO2/PAC displayed a high energy density of 23.3 Wh kg-1 and a power density of 350.4 W kg-1 at a current density of 0.5 A/g. Furthermore, the device showcased exceptional cycling stability, retaining 90.3 % at a current density of 4 A/g. These results underscore the substantial untapped potential of ASC devices for innovative applications in advanced energy storage.
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