Graphene-Based Aerogels Derived from Biomass for Energy Storage and Environmental Remediation

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 bioresources. 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 m 2 g −1 ) and pore volume (0.68 cm 3 g −1 ), which tremendously increase its surface area up to 2323 m 2 g −1 and pore volume of 1.15 cm 3 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 us to take the full advantage of raw materials from nature for promising applications in sustainable energy as high-performance SCs and practical environmental remediation.

Methylene blue decolorizing bacteria isolated from water sewage in Yogyakarta, Indonesia

“…Many technologies have been employed to eliminate the contamination of methylene blue in the environment. Recently, physicochemical approaches, including photocatalysis, physiochemical adsorption, and non-thermal plasma technology, have garnered popularity due to its high efficiency and degradation percentage (Das et al 2019;Myung et al 2019;Wu et al 2019). However, high complexity, low economic feasibility, and disposal problems by some of these methods hinder their broad application, especially in a developing country (Zhou et al 2019).…”

Synthesis of Conductive Carbon Aerogels Decorated with β-Tricalcium Phosphate Nanocrystallites

“…In particular, carbon-based composite materials have emerged as potentially promising targets for growth of electroactive tissues such as cardiac muscle, nerve and bone since the stimulation of osteogenesis due to inherent piezoelectric features of bone tissues attainable on conductive scaffolds [5][6][7][8][9] . Among these, blended composites between nanostructured carbon materials (carbon nanofibers/nanotubes and graphene) and biocompatible polymers (poly(vinyl alcohol), alginate, poly(lactide-co-glycolide and collagen) have been widely investigated as future materials for tissue engineering [10][11][12][13][14][15][16][17] . However, it is often essential to use a substantial amount of nanostructured carbons as a major component for achieving high conductivity in the composites.…”

Understanding of the Mechanism for Laser Ablation-Assisted Patterning of Graphene/ITO Double Layers: Role of Effective Thermal Energy Transfer

“…On each part of the laser-ablated graphene patterns, the Raman spectra were compared, as shown in Figure 7 b, from 200 to 3150 cm −1 . For the region 1, the three characteristic bands, D-, G-, and 2D-band, indicative of the existence of a graphene layer were found [ 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 ]. A D-band peak (~1350 cm −1 ) of weak intensity and both G- (~1580 cm −1 ) and 2D-band peaks (~2700 cm −1 ) on the graphene layer were observed.…”