Facile Synthesis of Highly Porous N-Doped Carbon Nanosheets with Silica Nanoparticles for Ultrahigh Capacitance Supercapacitors

Gopalakrishnan, Arthi and Yu, Aimin and Badhulika, Sushmee (2020) Facile Synthesis of Highly Porous N-Doped Carbon Nanosheets with Silica Nanoparticles for Ultrahigh Capacitance Supercapacitors. Energy & Fuels, 34 (9). pp. 11508-11518. ISSN 0887-0624

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Low-cost, scalable, and abundant biomass-derived carbon materials have attracted considerable attention. Herein, we report on novel self-doped (nitrogen) porous carbon nanosheets by carbonization/activation of acorn shells as a biomass precursor for use in high-performance supercapacitors (SCs), which contain SiO2 nanoparticles embedded in carbon nanosheets. This oaknut shell-based activated carbon (AOC) generates an ultrahigh surface area of 3757 m2 g-1, with micropore-mesopore distribution and formation of moderately graphitized sp2 carbon structures. The AOC electrode delivers an impressive specific capacitance of 505 F g-1 at 1.6 A g-1 in three-electrode systems, which is higher than the reported biomass-derived electrodes so far. Further, the symmetric SC displays a remarkable specific energy of 12.7 W h kg-1 at a specific power of 200 W kg-1 in neutral electrolytes, exhibiting high rate capability and retaining 96% of capacitance compared to commercial activated carbon. The outstanding electrochemical performance of the electrode can be ascribed to the large surface area with optimum pore tortuosity for ion transport, high electrical conductivity, and presence of self-doped heteroatoms. Overall, we believe that this high-specific energy self-doped tunable porous carbon can be utilized for industrial SCs.

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IITH Creators:
IITH CreatorsORCiD
Gopalakrishnan, ArthiUNSPECIFIED
Badhulika, SushmeeUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Commercial activated carbons; Electrochemical performance; High electrical conductivity; High rate capability; Large surface area; Neutral electrolytes; Specific capacitance; Three electrode-system;Activated carbon; Biomass; Capacitance; Carbonization; Doping (additives); Nanoparticles; Nanosheets; Porous materials; Silica; Silica nanoparticles; SiO2 nanoparticles; Supercapacitor; Synthesis (chemical)
Subjects: Electrical Engineering
Divisions: Department of Engineering Science
Depositing User: . LibTrainee 2021
Date Deposited: 05 Aug 2021 05:49
Last Modified: 05 Aug 2021 05:49
URI: http://raiith.iith.ac.in/id/eprint/8679
Publisher URL: http://doi.org/10.1021/acs.energyfuels.0c02078
OA policy: https://v2.sherpa.ac.uk/id/publication/7773
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