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Nitrogen- and sulfur-enriched porous carbon from waste watermelon seeds for high-energy, high-temperature green ultracapacitors

Title
Nitrogen- and sulfur-enriched porous carbon from waste watermelon seeds for high-energy, high-temperature green ultracapacitors
Author
김동원
Keywords
DOUBLE-LAYER CAPACITORS; HIGH-POWER; DENSITY SUPERCAPACITORS; ACTIVATED CARBONS; KOH ACTIVATION; PORE STRUCTURE; SURFACE-AREA; PERFORMANCE; GRAPHENE; ELECTRODES
Issue Date
2018-09
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v. 6, no. 36, page. 17751-17762
Abstract
Electrochemical ultracapacitors exhibiting high energy output and an ultra-long cycle life, utilizing green and sustainable materials, are of paramount importance for next-generation applications. Developing an ultracapacitor that has high output energy under high power conditions in a high-voltage non-aqueous electrolyte and maintaining a long cycle life is an ongoing challenge. Herein, we utilize watermelon seeds, a bio-waste from watermelons, for use in high-voltage, high-energy, and high-power ultracapacitors in a sodium ion-based non-aqueous electrolyte. The as-synthesized hierarchically porous, high surface area carbon is surface-engineered with a large quantity of nitrogen and sulfur heteroatoms to give a high specific capacitance of similar to 252 F g(-1) at 0.5 A g(-1) and 90 F g(-1) at 30 A g(-1). An ultra-high stability of similar to 90% even after 150 000 cycles (10 A g(-1)) with 100% coulombic efficiency is achieved at room temperature (25 degrees C), equivalent to an ultra-low energy loss of similar to 0.0667% per 1000 cycles. Furthermore, the porous carbon demonstrates remarkable stability even at high temperature (55 degrees C) for 100000 cycles (10 A g(-1)), ensuring the safety of the device and enabling it to outperform graphene-based materials. A maximum energy of similar to 79 W h kg(-1) and a maximum power of 22.5 kW kg(-1) with an energy retention of similar to 28.2 W h kg(-1) was attained. The results provide new insights that will be of use in the development of high-performance, green ultracapacitors for advanced energy storage systems.
URI
https://pubs.rsc.org/en/content/articlelanding/2018/TA/C8TA05248D#!divAbstracthttp://repository.hanyang.ac.kr/handle/20.500.11754/119904
ISSN
2050-7488; 2050-7496
DOI
10.1039/c8ta05248d
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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