High energy density supercapacitors with hierarchical nitrogen-doped porous carbon as active material obtained from bio-waste

Chen, Tingting; Luo, Liuxuan; Luo, Lingcong; Deng, Jianping; Wu, Xi; Fan, Mizi; Du, Guanben; Zhao, Wenxia

doi:10.1016/j.renene.2021.05.006

Cited by 74 publications

(16 citation statements)

References 62 publications

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“…The conversion of waste materials into porous carbon electrodes for EDLCs is an important area of research. Recently, various biomass and agricultural wastes have been used to produce hierarchical porous carbons (HPCs) e.g., waste coffee grounds 14 , sword bean shells 15 , soybean dreg 16 , corn husk 17 , corn cob and leaf 18 , wheat straw 18 , foxtail grasses 19 , mangosteen peel 20 , mango stone 21 , Lentinus edodes 22 , etc. Besides, Wu.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical porous carbon foam electrodes fabricated from waste polyurethane elastomer template for electric double-layer capacitors

Udayakumar

Tóth

Wiinikka

et al. 2022

Sci Rep

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Plastic waste has become a major global environmental concern. The utilization of solid waste-derived porous carbon for energy storage has received widespread attention in recent times. Herein, we report the comparison of electrochemical performance of porous carbon foams (CFs) produced from waste polyurethane (PU) elastomer templates via two different activation pathways. Electric double-layer capacitors (EDLCs) fabricated from the carbon foam exhibited a gravimetric capacitance of 74.4 F/g at 0.1 A/g. High packing density due to the presence of carbon spheres in the hierarchical structure offered excellent volumetric capacitance of 134.7 F/cm3 at 0.1 A/g. Besides, the CF-based EDLCs exhibited Coulombic efficiency close to 100% and showed stable cyclic performance for 5000 charge–discharge cycles with good capacitance retention of 97.7% at 3 A/g. Low equivalent series resistance (1.05 Ω) and charge transfer resistance (0.23 Ω) due to the extensive presence of hydroxyl functional groups contributed to attaining high power (48.89 kW/kg). Based on the preferred properties such as high specific surface area, hierarchical pore structure, surface functionalities, low metallic impurities, high conductivity and desirable capacitive behaviour, the CF prepared from waste PU elastomers have shown potential to be adopted as electrodes in EDLCs.

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Section: Introductionmentioning

confidence: 99%

Hierarchical porous carbon foam electrodes fabricated from waste polyurethane elastomer template for electric double-layer capacitors

Udayakumar

Tóth

Wiinikka

et al. 2022

Sci Rep

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“…Benefiting from the wider operating potential (1.6 V) and high specific capacitance, the bio‐polymeric based flexible supercapacitor exhibits a high energy density of 36.2 Wh kg −1 at power densities of 199.7 W kg −1 . Owing to its good rate capability, at current density of 30 Ag −1 , the flexible device still secured energy density of 13.3 Wh kg −1 even at higher power densities of 24 000 W kg −1 which is an attractive result and competitive to most recently reported devices with nut‐shells and other biomass carbon electrodes 94,104‐112 . The reason behind this excellent performance is attributed to the graphene‐like porous carbons with high surface area obtained through sono‐exfoliation process promoting faster ion‐transport kinetics with high energy storage capability making them an ideal choice for supercapacitor electrodes.…”

Section: Resultsmentioning

confidence: 99%

“…Owing to its good rate capability, at current density of 30 Ag À1 , the flexible device still secured energy density of 13.3 Wh kg À1 even at higher power densities of 24 000 W kg À1 which is an attractive result and competitive to most recently reported devices with nut-shells and other biomass carbon electrodes. 94,[104][105][106][107][108][109][110][111][112] The reason behind this excellent performance is attributed to the graphene-like porous carbons with high surface area obtained through sono-exfoliation process promoting faster ion-transport kinetics with high energy storage capability making them an ideal choice for supercapacitor electrodes. To further demonstrate the mechanical stability of the Exf.…”

Section: Solid State Flexible Supercapacitormentioning

confidence: 99%

Sono‐exfoliated graphene‐like activated carbon from hazelnut shells for flexible supercapacitors

Reddygunta

Callander

Šiller

et al. 2022

Intl J of Energy Research

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Currently, more than 80% of commercial supercapacitors utilize chemically synthesized carbon nanomaterials which are expensive and necessitates non-renewable resources. Employing renewable, environment friendly and naturally available biomass feedstock as precursor for producing carbon materials is a low-cost and sustainable way for designing the electrodes of supercapacitors. In the present study, high surface area hierarchical porous multilayered graphene-like carbon is obtained via room temperature sono-exfoliation of the activated carbon synthesized via simple and environmentally friendly hydrothermal carbonization and potassium bicarbonate activation of waste hazelnut shells as the precursor. The high surface area graphene-like carbon showed excellent electrochemical performance with specific capacitance of 320.9 F g À1 at 0.2 A g À1 current density and exceptional capacitance retention of 77.8% at 2 A g À1 current density after 10 000 cycles in 1 M Na 2 SO 4 electrolyte. Moreover, flexible supercapacitors fabricated using sonoexfoliated graphene-like activated carbon coated stainless steel mesh electrodes and biopolymer gel electrolyte exhibits an outstanding energy density of 38.7 W h kg À1 and power density of 198.4 W kg À1 . These results show that mechanically exfoliated graphene-like activated carbon derived from hazelnut shells exhibit superior electrochemical performance that can compete with other activated carbon materials used in energy storage devices for real time applications.

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“…Table 2 gives details reported in the literature on the supercapacitance performance of SCCs fabricated using different biowaste carbon precursors with respect to surface area, aqueous electrolyte, operating potential window, ED, PD, cycle stability and C s retention at various current densities. 29,30,[34][35][36][37][38][39][40] The practical achievability of SCCs designed using milkweed oss (MW-2) was further assessed by EIS studies mainly to determine the resistances (R s and R ct ) offered during chargedischarge cycles. Fig.…”

Section: Symmetric Coin Cell (Scc)mentioning

confidence: 99%

KOH-activated microstructured carbon derived from Asclepias syriaca floss for extraordinary 200k cycle stability in supercapacitors

Byatarayappa¹,

Guna²,

G³

et al. 2022

Sustainable Energy Fuels

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High energy density supercapacitors with hierarchical nitrogen-doped porous carbon as active material obtained from bio-waste

Cited by 74 publications

References 62 publications

Hierarchical porous carbon foam electrodes fabricated from waste polyurethane elastomer template for electric double-layer capacitors

Hierarchical porous carbon foam electrodes fabricated from waste polyurethane elastomer template for electric double-layer capacitors

Sono‐exfoliated graphene‐like activated carbon from hazelnut shells for flexible supercapacitors

KOH-activated microstructured carbon derived from Asclepias syriaca floss for extraordinary 200k cycle stability in supercapacitors

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