Towards high-energy-density supercapacitors via less-defects activated carbon from sawdust

Eleri, Obinna Egwu; Azuatalam, Kingsley Ugochukwu; Minde, Mona Wetrhus; Trindade, Ana Maria; Muthuswamy, Navaneethan; Lou, Fengliu; Yu, Zhixin

doi:10.1016/j.electacta.2020.137152

Cited by 28 publications

(15 citation statements)

References 68 publications

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“…As can be seen from Figure 5 a,b, both samples exhibit the large CV hysteresis loops at various scan rates of 10–100 mV/s. Such a clear appearance of the typical rectangular CV loops indisputably depicts the effective electrocatalytic behavior occurring inside the electrocatalyst [ 36 , 40 , 41 ]. Compared to HH-AC-600, however, HH-AC-700 show the higher integrated CV areas and the improved current–voltage responses.…”

Section: Resultsmentioning

confidence: 99%

Excellent Electrocatalytic Hydrogen Evolution Reaction Performances of Partially Graphitized Activated-Carbon Nanobundles Derived from Biomass Human Hair Wastes

Lee

Sim

2022

Nanomaterials

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Carbonaceous materials play a vital role as an appropriate catalyst for electrocatalytic hydrogen production. Aiming at realizing the highly efficient hydrogen evolution reaction (HER), the partially graphitized activated-carbon nanobundles were synthesized as a high-performance HER electrocatalyst by using biomass human hair ashes through the high-temperature KOH activation at two different temperatures of 600 and 700 °C. Due to the partial graphitization, the 700 °C KOH-activated partially graphitized activated-carbon nanobundles exhibited higher electrical conductivity as well as higher textural porosity than those of the amorphous activated-carbon nanobundles that had been prepared by the KOH activation at 600 °C. As a consequence, the 700 °C-activated partially graphitized activated-carbon nanobundles showed the extraordinarily high HER activity with the very low overpotential (≈16 mV at 10 mA/cm2 in 0.5 M H2SO4) and the small Tafel slope (≈51 mV/dec). These results suggest that the human hair-derived partially graphitized activated-carbon nanobundles can be effectively utilized as a high-performance HER electrocatalyst in future hydrogen-energy technology.

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Section: Resultsmentioning

confidence: 99%

Excellent Electrocatalytic Hydrogen Evolution Reaction Performances of Partially Graphitized Activated-Carbon Nanobundles Derived from Biomass Human Hair Wastes

Lee

Sim

2022

Nanomaterials

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“…After activation, the obtained material was washed with HCl 0.1 M under stirring, and later with distilled water under vacuum filtration up to neutral pH. Finally, the washed sample was dried overnight at 105°C [12].…”

Section: Production Of Activated Carbonmentioning

confidence: 99%

“…Carbonization depends on several factors such as the existence of an inert atmosphere, the heating rate, the carbonization temperature, and time [5,10]. The resulting char can be activated through chemical activation that could be performed by impregnation (wet oxidation) or by mixing the char with the solid activating agent (dry oxidation) [11][12][13]. Regarding the activating agents, they act as dehydrating agents which influence the decomposition by pyrolysis and inhibit the formation of tar.…”

Section: Introductionmentioning

confidence: 99%

Preparation of activated carbon from pine (Pinus radiata) sawdust by chemical activation with zinc chloride for wood dye adsorption

Pimentel

Freire

Gómez‐Díaz

et al. 2023

Biomass Conv. Bioref.

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Wastewater containing dyes are released into water bodies generating serious problems in human health and marine life. To contribute to the solution of this problem, a novel activated carbon was prepared from untreated pine (Pinus radiata) sawdust by dry chemical activation with ZnCl2 and was used for wood dye adsorption. The carbon was characterized by point of zero charge, N2 and CO2 adsorption isotherms, SEM-EDX, and FTIR. N2 and CO2 surface areas were 471.4 and 319.5 m2 g−1, respectively, with 91% of micropores. Wood dye adsorption was studied in function of pH (2–12), adsorbent dose (0.1–4 g L−1), time (up to 48 h for blue and red and 12 h for black), and initial concentration (5–500 mg L−1). The equilibrium data for the blue and black dyes were satisfactorily fitted to the Freundlich model while those for the red dye to the Langmuir model. Kinetic data were explained by the pseudo-second order (chemisorption process) and intraparticle diffusion models. At 5 mg L−1, a 100% removal efficiency was achieved at all pH for the blue dye, whereas for the red and black, natural pH (5.1) and pH = 2, respectively, led to the best removal efficiencies, 96 and 56%. Increasing concentration above 25 mg L−1 significantly reduced adsorption efficiency for blue and red dyes. For the black dye increasing the dose to 1 g L−1, the adsorption efficiency reached 82% at 25 mg L−1. High removal efficiencies were achieved for all dyes at 25 mg L−1 and 4 g L−1.

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“…Jiménez et al [16] synthesized microporous carbon materials from grape seeds through cyclic oxidation. By nondestructive activation of sawdust, reduction of defects and improvements of surface area and conductivity can be achieved [17] using KOH.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Graphene Oxide/Polypyrrole/Ziziphus jujuba/Prunus dulcis Ternary Composite Electrodes for Supercapacitor for Sensor Applications

Maheswaran¹,

Kavitha²,

Karthikeyan³

et al. 2022

Journal of Nanomaterials

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Supercapacitor electrodes synthesized from activated carbon (AC) has high energy and power capabilities as they have larger surface area, greater conductivity, and also AC has the ability to optimize the properties of supercapacitors. Supercapacitor has gained its attention due to its fast charging/discharging speed and long-term stability than the normal batteries. In this work, GO/PPy/AC composite electrodes was synthesized to increase the specific capacitance and the energy storage capability of supercapacitor through modified hummers’ method, sacrificial template polymerization method, and hydrothermal method. Here, the AC was derived from seeds of Ziziphus jujuba and shells of Prunus dulcis. The performances of GO, GO/PPy, GO/PPy/ACZJ, and GO/PPy/ACPD electrodes were evaluated using 6 M KOH electrolyte at different current densities and scan rates. The electrochemical properties of the electrodes were characterized by CV, GCD, and EIS analysis to study the suitability of the electrode material. GO/PPy/ACPD electrode exhibited the specific capacitance of 1217.1, 456.67, 270.44, and 90.88 F g-1 with current densities of 1, 2, 4, and 10 A g-1, respectively. GO/PPy/ACPD has high specific capacitance of 1217.1 F g-1 at 1 A g-1. The enhanced electrochemical performance is due to better surface area and higher specific capacitance.

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Towards high-energy-density supercapacitors via less-defects activated carbon from sawdust

Cited by 28 publications

References 68 publications

Excellent Electrocatalytic Hydrogen Evolution Reaction Performances of Partially Graphitized Activated-Carbon Nanobundles Derived from Biomass Human Hair Wastes

Excellent Electrocatalytic Hydrogen Evolution Reaction Performances of Partially Graphitized Activated-Carbon Nanobundles Derived from Biomass Human Hair Wastes

Preparation of activated carbon from pine (Pinus radiata) sawdust by chemical activation with zinc chloride for wood dye adsorption

High‐Performance Graphene Oxide/Polypyrrole/Ziziphus jujuba/Prunus dulcis Ternary Composite Electrodes for Supercapacitor for Sensor Applications

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