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Graphene-based Aerogels Derived from Biomass for Energy Storage and Environmental Remediation Yusik Myung, Sunghoon Jung, Tran Thanh Tung, Kumud Malika Tripathi, and TaeYoung Kim ACS Sustainable Chem. Eng., Just Accepted Manuscript • DOI: 10.1021/ acssuschemeng.8b04202 • Publication Date (Web): 15 Jan 2019 Downloaded from http://pubs.acs.org on January 16, 2019
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ACS Sustainable Chemistry & Engineering
Graphene-based Aerogels Derived from Biomass for Energy Storage and Environmental Remediation Yusik Myung,a Sunghoon Jung,a Tran Thanh Tung,b Kumud Malika Tripathi,a* and TaeYoung Kima* a
Department of Bionanotechnology, Gachon University, 1342 Seongnam-daero, Sujeong-gu,
Seongnam-si, Gyeonggi-do 13120, South Korea. b
School of Chemical Engineering, the University of Adelaide, Adelaide, 5005 North Terrace,
South Australia *Corresponding
Author, E-mail:
[email protected] (K. M. T),
[email protected]. (T. K)
Abstract To resist the energy crisis and increasingly environmental pollution, there is a great demand for the development of sustainable materials for use in high-performance energy storage devices and environmental applications. However, it is a great challenge to realize both ultrahigh power density and high energy density in symmetric supercapacitors (SCs) by using materials synthesized from bio-resources. Herein, we report the synthesis of hierarchical and lightweight graphene aerogels (GAs) with interconnected three-dimensional (3D) nanostructures for the fabrication of high performance coin cell-type SCs. GAs synthesized from pear exhibited high surface area (1001 m2 g-1) and pore volume (0.68 cm3 g-1), which tremendously increase its surface area up to 2323 m2 g-1, and pore volume of 1.15 cm3 g-1 after chemical activation. SCs based on activated GAs delivered both high energy density of 56.80 Wh kg-1 and high power density of 620.26 kW kg-1. The capacitance retention was ~83% after 10,000 successive cycles of charge/discharge, indicating good cyclability. Moreover, GAs showed great potential as excellent adsorbents for the removal of diverse dyes from wastewater. This approach allows to take the full advantage of raw materials from nature for promising applications in sustainable energy as high-performance SCs and practical environmental remediation. Keywords: Graphene aerogels, porous graphene, supercapacitors, organic dyes, adsorption.
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Introduction High-power electrochemical energy storage devices are becoming critical components of a sustainable future owing to the gradual depletion of fossil fuels and severe stress from environmental pollution. Among the available energy storage devices, supercapacitors (SCs) and ultracapacitors are most promising as they offer a broader temperature window, longer cycle life, short charge-discharge time, higher power density, and low maintenance cost.1-3 SCs have considerable potential as a substituent or supplement of batteries in a variety of applications by using suitable and high-quality electrode materials.4-5 Indeed, the characteristic properties of SCs are difficult to exploit in batteries because of the occurrence of irreversible and time-consuming redox reactions, in contrast to purely non-faradic surface adsorption of electrolyte ions on a charged electrode surface.4 However, the substantially lower energy density (
