Waste coffee grounds derived nanoporous carbon incorporated with carbon nanotubes composites for electrochemical double-layer capacitors in organic electrolyte

Poochai, Chatwarin; Srikhaow, Assadawoot; Lohitkarn, Jaruwit; Kongthong, Tanaporn; Tuantranont, Sorawit; Tuantranont, Sirirada; Primpray, Vitsarut; Maeboonruan, Nattida; Wisitsoraat, Anurat; Sriprachuabwong, Chakrit

doi:10.1016/j.est.2021.103169

Cited by 21 publications

(13 citation statements)

References 54 publications

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“…Clearly, the appropriate proportion of BP2000/Super P = 75/25 in AC2500 is superior to that of all other carbon samples. The specific capacitance of an AC2500-based electrode can reach 224.6 F g –1 at 0.5 A g –1 , which is higher than that of previously reported organic EDLC systems. − …”

Section: Resultsmentioning

confidence: 66%

“…Recently, new-concept porous materials paired with appropriate electrolytes have demonstrated significant improvements in energy density for EDLC. , Hierarchical porous carbons with an appropriate micropore/mesopore proportion appear to have a greater specific capacitance as well as a high energy density. − Even so, designing the optimum pore shape for ions diffusion and a high connecting framework for electron transportation in carbon-based materials remains a challenge, particularly in quick charge–discharge behaviors. − Porous nanosheet-like morphologies, such as graphene or graphene-based components, ,,, have showed remarkable energy density with high power density among the superior forms of known carbon materials. Aside from graphene-based materials, a simple and cost-effective approach based on similar nanosheet-like structures generated from biomass wastes may also be beneficial for high-performance EDLC. − As we know, only a few biomass wastes, such as SCGs, can generate 2D PCNs structures. − However, under fast charge–discharge conditions, the specific capacitance clearly decayed due to a lack of high electron-connecting channels, which will slow the electrolyte ions’ access to the surface of the carbon electrodes. This disadvantage was partially overcome by the addition of an electron conductive additive, such as CB Super P, acetylene, or BP2000, to create effective electron-transporting pathways anchored on porous carbons.…”

Section: Resultsmentioning

confidence: 99%

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Porous Carbon Nanosheets Derived from Spent Coffee Grounds for Highly Stable Electric Double-Layer Capacitors Enabled by Structurally Complementary Carbons

Yu,

Hsieh,

Lin

et al. 2023

ACS Sustainable Resour. Manage.

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Despite the fact that porous carbons are the primary components of electric double-layer capacitors (EDLC), conductive additives have typically been necessary to aid in the establishment of improved conductive pathways. In this study, we use two-dimensional porous carbon sheets (2D PCNs) derived from spent coffee grounds as the active component and integrated them with two structurally complementary carbon blacks (CB)-BP2000 and Super P to compose a highly stable EDLC electrode in an organic electrolyte. The carbon electrode with the best mass ratio is AC2500/BP2000/Super P = 100/15/5 (AC25-BP75SP25) and was prepared using a suction-filtration method on a cellulose separator rather than direct coating on a metallic foil. The specific capacitance of AC25-BP75SP25-based EDLCs in 1 M TEABF 4 /propylene carbonate is as high as 226.8 F g −1 at 0.5 A g −1 . Furthermore, the cycling tests show a specific capacitance of 194.6 F g −1 at 5 A g −1 with a high-voltage window of 2.5−2.7 V and a Coulombic efficiency near 98 % after 50,000 cycles. The value is remarkably stable when compared with the AC2500-based electrode without conductive CB or adding only one kind of CB. The energy density can reach a high level of 56.7 Wh kg −1 @ 750 W kg −1 and 42.8 Wh kg −1 @ 11.8 kW kg −1 , indicating that the assembled EDLC can maintain a high energy density when operated under harsh charge−discharge conditions. Our findings could provide a new strategy to practically utilize carbon-electrode materials derived from biomass wastes for high-performance EDLC.

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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Porous Carbon Nanosheets Derived from Spent Coffee Grounds for Highly Stable Electric Double-Layer Capacitors Enabled by Structurally Complementary Carbons

Yu,

Hsieh,

Lin

et al. 2023

ACS Sustainable Resour. Manage.

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“…42 The average crystallite size of the fabricated AgBiS 2 nanostructure examined with the Scherrer equation was 65 nm. 43 D K cos = (7) wherein, λ = 0.15406 nm wavelength (), K = Scherrer coefficient (0.89), D = crystallite size, and β = full width half maxima.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Development of Bimetallic Sulfide Nanostructures as an Electrode Material for Supercapacitor Application

Aman,

Alahmari,

Khan

et al. 2023

Energy Fuels

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Supercapacitors (SCs) possess specialized capabilities and exhibit rapid charging and discharging rates, making them highly suitable for integration into portable energy storage and conversion devices. These devices have witnessed a notable surge in demand and are increasingly contributing to the overall progress of the global energy industry. However, the bimetallic sulfide displays a high energy density, and high capacitance helps to resolve the limitation of monometallic sulfide. This study examines the advantageous characteristics of AgBiS2 as a viable energy storage medium in electrochemistry. These characteristics encompass a high level of electrical conductivity and a relatively low cost. AgBiS2 nanostructures were effectively synthesized in the laboratory by utilizing a straightforward hydrothermal method. The produced nanostructure of AgBiS2 is subjected to a range of evaluations encompassing electrochemical and physiochemical analyses. A specimen of AgBiS2 was positioned onto a substrate composed of nickel foam to facilitate measurement of its capacitance. The combined effect of Ag and rate and the supercapacitor’s electrochemical performance. The galvanometric charge–discharge (GCD) profile of an AgBiS2 nanostructure, obtained using a three-electrode configuration in 2.0 M KOH, demonstrates a specific capacitance (C s) of 650 F g–1 at 1 A g–1 current density. Additionally, the nanostructure exhibits a capacitive retention of 89% over 7000 cycles within the potential range 0–0.6 V (Ag/AgCl). When subjected to symmetric analysis, the AgBiS2 electrode exhibits a significant specific capacitance (C s) of 401 F g–1. This high capacitance is observed at 1 A g–1 in a two-electrode setup, employing an aqueous electrolyte of 2.0 M KOH. The symmetric AgBiS2 electrode-based supercapacitor exhibits a specific energy (S E) of 65 Wh kg–1 and a specific power (S P) of 0.28 W kg–1. The capacitive outcomes depend on the larger interfacial area, synergistic effect, and low resistance value. According to capacitive investigations, the AgBiS2 electrode exhibits potential utility in various domains, including but not limited to supercapacitor applications, photocatalysis, water splitting, and water remediation.

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“…Poochai et al 2021 [26] Dried at 80 °C for 24 h and then pyrolyzed at 700 °C for 1 h under a Retention of 85% after 10 000 cycles at 3 A g −1…”

Section: All Samples Exceeded 87%mentioning

confidence: 99%

Reusing Waste Coffee Grounds as Electrode Materials: Recent Advances and Future Opportunities

et al. 2022

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202200093400 billion cups per year and an annual growth of 1.3% since 2012/2013. [50,51] An average cup of coffee has roughly 11 g of ground coffee, which equates to over 9 million tons of ground coffee being brewed worldwide per annum. The global consumption of coffee over the last decade has steadily increased to over 10 million tons by 2021, and this increase is clearly illustrated by Figure 1. For every 1 kg of coffee grounds used within the beverage industry, roughly 0.9 kg is discarded as waste. This has led to millions of tons of waste coffee grounds (WCG) per year. [52] When these WCG is disposed of as landfill waste, they decompose and emit methane which is a potent greenhouse gas (25 times more potent than carbon dioxide over 100 years period) with severe adverse effects to the environment. [50] In addition, the leachates and soluble from WCG in landfill and via sewage was also found to cause DNA damage and thus induce genotoxicity in aquatic organisms. [53] In recent years, the concept of circular economy began to gain traction and most leading countries have been increasing the efforts to shift their economy toward this paradigm. Circular economy aims for economic activities to build and rebuild overall system health by reducing or eliminating the overall amount of waste in society via recycling and reusing products. [55,56] As the coffee is mainly disposed as waste after its initial brew and these WCG can pose a significant environmental risk in landfill (i.e., green gas emission and leachate-induced mutagenicity), it is imperative to find applications of WCG and thus promoting the transition to the circular economy in food industry. On the other hand, as one of the most abundant types of food waste, WCG contains a high volume of valuable sources of carbon and yet remains largely unexploited by industry at the moment. According to a study that investigated chemical, functional, and structural properties of WCG, [57] its most abundant components were found to be macro molecules of cellulose and hemicellulose structures which are polymeric structures of hexose saccharides. These two structures can account for 51.50% w/w of the total mass on a dry weight basis. Second highest component was found to be lignin, a highly aromatic structure comprised of crosslinked phenolic structures, which can be up to 40% w/w based on a sulfuric acid hydrolysis extraction. [58] The rest of WCG composition includes fatty and amino acids, polyphenols, caffeine, tannins, and minerals, [45] etc.Coffee industry produces more than eight million tons of waste coffee grounds (WCG) annually. These WCG contain caffeine, tannins, and polyphenols and can be of great environmental concern if not properly disposed of. On the other hand, components of WCG are mainly macromolecular cellulose and lignocellulose, which can be utilized as cheap carbon precursors. Accordingly, various forms of carbon materials have been reportedly synthesized from WCG, including activated carbon, mesoporous carbon, carbon nanosheets, carbon nanotubes, grap...

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Waste coffee grounds derived nanoporous carbon incorporated with carbon nanotubes composites for electrochemical double-layer capacitors in organic electrolyte

Cited by 21 publications

References 54 publications

Porous Carbon Nanosheets Derived from Spent Coffee Grounds for Highly Stable Electric Double-Layer Capacitors Enabled by Structurally Complementary Carbons

Porous Carbon Nanosheets Derived from Spent Coffee Grounds for Highly Stable Electric Double-Layer Capacitors Enabled by Structurally Complementary Carbons

Hydrothermal Development of Bimetallic Sulfide Nanostructures as an Electrode Material for Supercapacitor Application

Reusing Waste Coffee Grounds as Electrode Materials: Recent Advances and Future Opportunities

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