TY - JOUR

T1 - Asymmetric supercapacitors based on biomass-derived porous activated carbon (PAC)/1D manganese oxide (MnO2) electrodes with high power and energy densities

AU - Lee, Young-Seok

AU - Selvaraj, Aravindha Raja

AU - Kostoglou, Nikolaos

AU - Rebholz, Claus

AU - Rajendiran, Rajmohan

AU - Raman, Vivekanandan

AU - Kim, Heeje

AU - Rajesh, John Anthuvan

AU - Nagulapati, Vijay Mohan

AU - Oh, Tae Hwan

AU - Jerome, Peter

AU - Kim, Sung-Shin

N1 - Publisher Copyright: © 2024 Elsevier B.V.

PY - 2024/6

Y1 - 2024/6

N2 - In this study, we present the electrochemical performance of an asymmetric supercapacitor (ASC) composed of one-dimensional manganese oxide (MnO 2) nanorods embedded in porous activated carbon sheets (MnO 2/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 MnO 2/PAC composite was successfully synthesized using a hydrothermal technique, while the PAC material was produced through pyrolysis reaction. The MnO 2/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 MnO 2 nanorods, in addition to the expansive surface area of the activated carbon sheets with closely packed structures. The ASC constructed as PAC//MnO 2/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.

AB - In this study, we present the electrochemical performance of an asymmetric supercapacitor (ASC) composed of one-dimensional manganese oxide (MnO 2) nanorods embedded in porous activated carbon sheets (MnO 2/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 MnO 2/PAC composite was successfully synthesized using a hydrothermal technique, while the PAC material was produced through pyrolysis reaction. The MnO 2/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 MnO 2 nanorods, in addition to the expansive surface area of the activated carbon sheets with closely packed structures. The ASC constructed as PAC//MnO 2/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.

KW - 1D β-MnO nanorods

KW - Asymmetric capacitors

KW - Biomass derived hierarchically porous carbon

KW - Pseudo capacitance

UR - http://www.scopus.com/inward/record.url?scp=85190242456&partnerID=8YFLogxK

U2 - 10.1016/j.mseb.2024.117368

DO - 10.1016/j.mseb.2024.117368

M3 - Article

VL - 304.2024

JO - Materials science and engineering B (Solid-state materials for advanced technology)

JF - Materials science and engineering B (Solid-state materials for advanced technology)

SN - 0921-5107

IS - June

M1 - 117368

ER -