Highly stable Megalopolis lignite based N and S self-doped hierarchically porous activated carbons for high performance supercapacitors and ash content effects on performance

Oglou, Ramadan Chalil; Gökçe, Yavuz; Yağmur, Emine; Ghobadi, T. Gamze Ulusoy; Aktaş, Zeki

doi:10.1016/j.est.2021.103817

Cited by 31 publications

(18 citation statements)

References 52 publications

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“…When the current density was increased from 0.1, 0.3, 0.5, 1, 3, and 5 Ag –1 , the specific capacitance decreased steadily from 206, 173, 158, 137, 122, and 118 Fg –1 , respectively. This decrease in specific capacitance as the current density increases could be attributed to the fact that higher current density limits the maximum utilization of the pores of the material, thereby contributing to the surge in internal resistance . Electrolyte diffusion through micro- and mesopores promotes electrochemical activity at low charging rates, leading to a significant increase in specific capacitance.…”

Section: Resultsmentioning

confidence: 88%

“…The curves’ semicircle represents internal resistance, which is the sum of bulk electrolyte resistance and charge-transfer resistance . In addition, the capacitive behavior of the electrode is shown by slanted straight lines toward the lower-frequency region …”

Section: Resultsmentioning

confidence: 99%

“…60 In addition, the capacitive behavior of the electrode is shown by slanted straight lines toward the lower-frequency region. 63 2.2.2. CV, GCD, and EIS Analyses in KOH Electrolyte.…”

Section: Structural and Morphological Characterizationsmentioning

confidence: 99%

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Activated Biocarbon from Paper Mill Sludge as Electrode Material for Supercapacitors: Comparative Performance Evaluation in Two Aqueous Electrolytes

et al. 2023

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The valorization of a South African paper mill waste sludge into an activated biocarbon electrode material for energy storage application is reported. The valorization method is a twostep synthesis that comprises hydrothermal carbonization and NaOH activation of paper mill waste at 700 °C to produce activated biocarbon. The development of high porosity carbon material with a surface area of 1139 m 2 /g was observed. The synthesized biocarbon electrode exhibited good specific capacitance (C sp ) values of 206 and 157 Fg −1 , from a three-electrode cell in neutral (1 M Na 2 SO 4 ) and alkali (3 M KOH) electrolytes, respectively. The electrolyte concentration purportedly has a considerable effect on specific capacitance. In both electrolytes, symmetric triangular curves in galvanostatic charge−discharge point to a quick charge−discharge process. Synthesized material testing with a two-electrode cell in 3 M KOH and 1 M Na 2 SO 4 electrolytes, respectively, delivered specific capacitances of 125 and 152 Fg −1 , with the corresponding energy densities of 17.4 and 21.1 Wh kg −1 . The material had capacity retention efficiencies of 83 and 92% after 5000 cycles in 3 M KOH and 1 M Na 2 SO 4 electrolytes, respectively. The electrode material performance of the activated biocarbon from paper sludge clearly shows its potential for electrochemical energy storage. The reported results present an exciting potential contribution of the pulp and paper industry toward the transition to green energy.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

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Activated Biocarbon from Paper Mill Sludge as Electrode Material for Supercapacitors: Comparative Performance Evaluation in Two Aqueous Electrolytes

et al. 2023

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“…Nevertheless, the environmental problems caused by traditional batteries cannot be ignored . Reducing environmental pollution while dealing with energy storage issues is one of the focuses to be addressed at present. , As an eco-friendly energy storage device, supercapacitors, including electric double-layer capacitors (EDLCs) and pseudocapacitors, have attracted extensive investigations due to their great advantages, such as high power density and long cycling life. − EDLCs have higher rapid charge–discharge performance than regular batteries by adsorbing a large number of electrolyte ions on the surface of electrodes . Carbon materials, such as graphene, , activated carbon, , carbon nanotubes, carbon nanofibers, , and carbon aerogel, are widely used as EDLCs because of their low cost, lightweight, high stability, and high plasticity .…”

Section: Introductionmentioning

confidence: 99%

“…Lignite has a 3D macromolecular network structure, which consists of condensed aromatic rings with bridged linkages and aliphatic side chains . Although lignite is macroscopically carbon enrichment and rich in oxygen-containing functional groups (OCFGs), the complex structure and mineral impurities of lignite limit its direct application for producing carbon materials .…”

Section: Introductionmentioning

confidence: 99%

Efficient Two-Step Utilization of Organic Matter in Shengli Lignite for Producing Chemicals and Supercapacitor Electrode Materials

et al. 2023

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Conversion of organic matter in lignite into chemicals and high-performance carbon materials is a promising approach for clean and efficient utilization of lignite. Herein, Shengli lignite (SL) is subjected to supercritical ethanolysis, followed by ultrasonic extraction with isometric carbon disulfide/ acetone for separating SL into soluble organic matters (SOMs) and insoluble extraction residue (ER) with highly condensed aromatic structures. According to the analyses with gas chromatography/ mass spectrometry (GC/MS) and Orbitrap MS, the SOMs were mainly composed of oxygen-containing compounds, such as arenols, aliphatic esters, and aromatic esters, which can be used as feedstock for producing value-added chemicals. The ER was used as a carbon precursor to produce three-dimensional porous carbon materials (PCMs) through precarbonization and activation with KOH using nano-ZnO as an in situ template. The prepared PCMs possessed high stability, large specific surface area, and abundant oxygen-doped carbon, showing a high specific capacitance of 300 F g −1 at 0.5 A g −1 in a three-electrode system, and the capacitance retention was 100% after 10,000 cycles of charge and discharge at 5 A g −1 in a two-electrode system.

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Construction of CoNi2S4/nitrogen-doped lignite-based porous carbon composites and their application in supercapacitors

Han

Ding

Zhu

2023

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Highly stable Megalopolis lignite based N and S self-doped hierarchically porous activated carbons for high performance supercapacitors and ash content effects on performance

Cited by 31 publications

References 52 publications

Activated Biocarbon from Paper Mill Sludge as Electrode Material for Supercapacitors: Comparative Performance Evaluation in Two Aqueous Electrolytes

Activated Biocarbon from Paper Mill Sludge as Electrode Material for Supercapacitors: Comparative Performance Evaluation in Two Aqueous Electrolytes

Efficient Two-Step Utilization of Organic Matter in Shengli Lignite for Producing Chemicals and Supercapacitor Electrode Materials

Construction of CoNi2S4/nitrogen-doped lignite-based porous carbon composites and their application in supercapacitors

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