Biochar obtained by carbonization of spent coffee grounds and its application in the construction of an energy storage device

Andrade, Tatiana Santos; Vakros, John; Mantzavinos, Dionissios; Lianos, Panagiotis

doi:10.1016/j.ceja.2020.100061

Cited by 54 publications

(35 citation statements)

References 38 publications

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“…Figure 1 a illustrates the homogeneous distribution of highly porous structure of HBP. As shown in Figure 1 b, the HPB surface was dominated by meso- and macro-pores after the chemical activation with KOH and carbonization, indicating the abundance of electroactive sites on its surface [ 28 ]. The HPB surface in Figure 1 c became rough in comparison with that of the pure HPB ( Figure 1 a), and some small particles can be seen after the attachment of Er-GQD nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Erbium-Doped GQD-Embedded Coffee-Ground-Derived Porous Biochar for Highly Efficient Asymmetric Supercapacitor

et al. 2022

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A nanocomposite with erbium-doped graphene quantum dots embedded in highly porous coffee-ground-derived biochar (Er-GQD/HPB) was synthesized as a promising electrode material for a highly efficient supercapacitor. The HPB showed high porosity, with a large surface area of 1295 m2 g−1 and an average pore size of 2.8 nm. The 2–8-nanometer Er-GQD nanoparticles were uniformly decorated on the HPB, subsequently increasing its specific surface area and thermal stability. Furthermore, the intimate contact between the Er-GQDs and HPB significantly reduced the charge-transfer resistance and diffusion path, leading to the rapid migration of ions/electrons in the mesoporous channels of the HPB. By adding Er-GQDs, the specific capacitance was dramatically increased from 337 F g−1 for the pure HPB to 699 F g−1 for the Er-GQD/HPB at 1 A g−1. The Ragone plot of the Er-GQD/HPB exhibited an ultrahigh energy density of 94.5 Wh kg−1 and a power density of 1.3 kW kg−1 at 1 A g−1. Furthermore, the Er-GQD/HPB electrode displayed excellent cycling stability, and 81% of the initial capacitance remained after 5000 cycles. Our results provide further insights into a promising supercapacitance material that offers the benefits of both fast ion transport from highly porous carbons and electrocatalytic improvement due to the embedment of Er-doped GQDs to enhance energy density relative to conventional materials.

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Section: Resultsmentioning

confidence: 99%

Erbium-Doped GQD-Embedded Coffee-Ground-Derived Porous Biochar for Highly Efficient Asymmetric Supercapacitor

et al. 2022

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“…Depending on additives in the process, the morphology can be influenced to result into 2D structures (rGO [60] or 2D nano sheets [57]) or highly porous carbon structures as a result from alkali inducing surface etching, resulting in outstanding high surface areas (reported up to 1857 [53], 1901 [54], or 2085 m 2 g −1 [55]). Self-doping in case of chitin-based biomass (shrimp [52], fish scales [57]) can be observed, or induced by additives to the carbonization leading to doping with nitrogen [35,58] or oxygen [55] or iron [59]. (b) The AC can be used to decorate the fiber surface, enhancing the electrocatalytic properties, determined by CV or EIS.…”

Section: Sustainable Electrodes For Rfbsmentioning

confidence: 99%

“…Another very popular source of biomass-waste carbon is spent coffee grounds and have been the focus of several reviews [58][59][60]. rGO derived from spent coffee grounds has been reported as electrode material for RFBs [61].…”

Section: Boosting Activity Of Carbon Felts Via Decoration With Biomas...mentioning

confidence: 99%

Sustainable electrodes for the next generation of redox flow batteries

2022

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The development of alternative energy storage technologies is key to advance renewable energy resources. Among them, redox flow batteries (RFBs) have been identified to be one of the most promising technologies in the field of stationary batteries. The carbon-based electrodes in these batteries are a crucial component and play an important part in achieving high efficiency and performance. A further leap into this direction is the design of fossil-free materials by incorporating sustainable alternative resources as the carbon component in the processing of the electrodes. The use of biomass as carbon precursor for electrode applications has also been a focus of research for other energy storage devices and in the case of RFBs, it has become an emergent topic in recent years. This short review presents the recent advances in the design of biomass-derived carbon materials as electrodes in RFBs, strategies to enhance their electrocatalytic properties, challenges, and future outlook in the design of sustainable electrode materials.

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“…This motivates on-going research interest for utilizing this waste as a resource for biogas/biofuel production or for the extraction of useful chemicals [7][8][9][10]. Bread and spent coffee wastes have also been employed as starting material for the development of advanced functional carbon materials with interesting properties, often produced via conventional pyrolytic or hydrothermal carbonization methods [11][12][13][14][15][16]. However, to the best of our knowledge, no report on bread and coffee biomass waste carbonization in piranha solution has been published so far.…”

Section: Introductionmentioning

confidence: 99%

Biomass Waste Carbonization in Piranha Solution: A Route to Hypergolic Carbons?

Chalmpes

Baikousi

Giousis

et al. 2022

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In the present work we report for the first time the carbonization of biomass waste, such as stale bread and spent coffee, in piranha solution (H2SO4-H2O2) at ambient conditions. Carbonization is fast and exothermic, resulting in the formation of carbon nanosheets at decent yields of 25–35%, depending on the starting material. The structure and morphology of the nanosheets were verified by X-ray diffraction, Raman, X-ray photoelectron and microscopy techniques. Interestingly, the obtained carbon spontaneously ignites upon contact with fuming nitric acid HNO3 at ambient conditions, thus offering a rare example of hypergolicity involving carbon as the solid fuel (i.e., hypergolic carbon). Based on the relatively large interlayer spacing of the as-produced carbons, a simple structural model is proposed for the observed hypergolicity, wherein HNO3 molecules fit in the gallery space of carbon, thus exposing its basal plane and defect sites to a spontaneous reaction with the strong oxidizing agent. This finding may pave the way towards new type hypergolic propellants based on carbon, the latter exclusively obtained by the carbonization of biomass waste in piranha solution.

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Biochar obtained by carbonization of spent coffee grounds and its application in the construction of an energy storage device

Cited by 54 publications

References 38 publications

Erbium-Doped GQD-Embedded Coffee-Ground-Derived Porous Biochar for Highly Efficient Asymmetric Supercapacitor

Erbium-Doped GQD-Embedded Coffee-Ground-Derived Porous Biochar for Highly Efficient Asymmetric Supercapacitor

Sustainable electrodes for the next generation of redox flow batteries

Biomass Waste Carbonization in Piranha Solution: A Route to Hypergolic Carbons?

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