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Efficient Preparation of Spongy-Like Porous-Activated Carbon from Waste Millfeed Towards High Performance Supercapacitors.

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Title: Efficient Preparation of Spongy-Like Porous-Activated Carbon from Waste Millfeed Towards High Performance Supercapacitors.
Authors: Han, Rong-Rong1 (AUTHOR), Zhu, Hao-Yan1 (AUTHOR), Li, Min-Peng1 (AUTHOR), Yang, Wen-Tong1 (AUTHOR), Lu, Chun1 (AUTHOR), Zhang, Yu-Shan1 (AUTHOR), Zhang, Bin-Mei1 (AUTHOR), Liang, Xiao-Rong1 (AUTHOR), Liu, Mao-Cheng1,2 (AUTHOR) liumc@lut.edu.cn
Source: NANO (1793-2920). Aug2020, Vol. 15 Issue 08, pN.PAG-N.PAG. 11p.
Subjects: Supercapacitor electrodes, Activated carbon, Supercapacitor performance, Energy density, Power density, Electrode potential, Carbon
Abstract: Biomass-based activated porous carbon (PC) with large porosity and high surface area has been considered as potential electrode material for supercapacitors. The spongy-like porous-activated carbon (SPAC) was prepared from millfeed by one-step carbonization/activation with KOH treatment. It shows three-dimensional (3D) spongy-like structure and high specific surface area (1535 m2 g − 1 ). The SPAC electrode exhibits a high specific capacitance (237.9 F g − 1 at a current density of 0.5 A g − 1 ) and a superior cycle stability (the capacitance retention of 95% after 10 000 cycles at 2 A g − 1 ) in 2 M KOH electrolyte, while the SPAC reveals a high specific capacitance of 157 F g − 1 at 0.5 A g − 1 , good electrochemical stability with 93% capacitance retention after 5000 cycles in ionic liquids. Furthermore, the specific capacitance of SPAC//SPAC supercapacitor reaches 82.1 F g − 1 at a current density of 0.5 A g − 1 and achieves a high capacitance retention of 75% when the charging current increases to 10 A g − 1 in 2 M KOH electrolyte. The SPAC//SPAC supercapacitor possesses a high specific capacitance of 29.6 F g − 1 at 0.5 A g − 1 and a preeminent energy density of 27.8 Wh kg − 1 (at a power density of 640 W kg − 1 ) in ionic liquids. This paper provides a convenient approach to synthesize low-cost biomass-based carbon material for supercapacitor applications. A spongy-link porous activated carbon (SPAC) was fabricated from millfeed in one-step carbonization/activation with in situ activation of the KOH method. The concentration of KOH plays a key role in the formation of porous structure under the experimental condition. The symmetrical SPAC/SPAC supercapacitor possesses excellent cycling stability and high energy density in KOH aqueous and ionic liquid electrolytes. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Biomass-based activated porous carbon (PC) with large porosity and high surface area has been considered as potential electrode material for supercapacitors. The spongy-like porous-activated carbon (SPAC) was prepared from millfeed by one-step carbonization/activation with KOH treatment. It shows three-dimensional (3D) spongy-like structure and high specific surface area (1535 m2 g − 1 ). The SPAC electrode exhibits a high specific capacitance (237.9 F g − 1 at a current density of 0.5 A g − 1 ) and a superior cycle stability (the capacitance retention of 95% after 10 000 cycles at 2 A g − 1 ) in 2 M KOH electrolyte, while the SPAC reveals a high specific capacitance of 157 F g − 1 at 0.5 A g − 1 , good electrochemical stability with 93% capacitance retention after 5000 cycles in ionic liquids. Furthermore, the specific capacitance of SPAC//SPAC supercapacitor reaches 82.1 F g − 1 at a current density of 0.5 A g − 1 and achieves a high capacitance retention of 75% when the charging current increases to 10 A g − 1 in 2 M KOH electrolyte. The SPAC//SPAC supercapacitor possesses a high specific capacitance of 29.6 F g − 1 at 0.5 A g − 1 and a preeminent energy density of 27.8 Wh kg − 1 (at a power density of 640 W kg − 1 ) in ionic liquids. This paper provides a convenient approach to synthesize low-cost biomass-based carbon material for supercapacitor applications. A spongy-link porous activated carbon (SPAC) was fabricated from millfeed in one-step carbonization/activation with in situ activation of the KOH method. The concentration of KOH plays a key role in the formation of porous structure under the experimental condition. The symmetrical SPAC/SPAC supercapacitor possesses excellent cycling stability and high energy density in KOH aqueous and ionic liquid electrolytes. [ABSTRACT FROM AUTHOR]
ISSN:17932920
DOI:10.1142/S1793292020501064