Hierarchical porous carbon derived from acai seed biowaste for supercapacitor electrode materials

Souza, Luiz K.C. de; Martins, João Carlos; Oliveira, Diogo Padilha; Ferreira, Chayanne Silva; Gonçalves, Alexandre A. S.; Araujo, Rayanne O.; Chaar, Jamal da Silva; Costa, Maria J. F.; Sampaio, D.V.; Passos, Raimundo R.; Pocrifka, Leandro A.

doi:10.1007/s10854-020-03761-5

Cited by 27 publications

(10 citation statements)

References 44 publications

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“…The almost similar R ct of PrGO/HKUST-1 before (1.16 Ω) and after (1.19 Ω) cycling stability test indicates good intrinsic conductivity 65 . The ESR of PrGO/HKUST-1 increases from 35.0 to 45.6 Ω, denoting a slight increment in the ionic resistance of electrolyte 6 , 66 and causing a small drop in the capacitance retention (95.5%) in the device.…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of PEDOT-rGO/HKUST-1 for high performance symmetrical supercapacitor device

Mohanadas

Abdah

Azman

et al. 2021

Sci Rep

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A novel poly(3,4-ethylenedioxythiophene)-reduced graphene oxide/copper-based metal–organic framework (PrGO/HKUST-1) has been successfully fabricated by incorporating electrochemically synthesized poly(3,4-ethylenedioxythiophene)-reduced graphene oxide (PrGO) and hydrothermally synthesized copper-based metal–organic framework (HKUST-1). The field emission scanning microscopy (FESEM) and elemental mapping analysis revealed an even distribution of poly(3,4-ethylenedioxythiophene) (PEDOT), reduced graphene oxide (rGO) and HKUST-1. The crystalline structure and vibration modes of PrGO/HKUST-1 were validated utilizing X-ray diffraction (XRD) as well as Raman spectroscopy, respectively. A remarkable specific capacitance (360.5 F/g) was obtained for PrGO/HKUST-1 compared to HKUST-1 (103.1 F/g), PrGO (98.5 F/g) and PEDOT (50.8 F/g) using KCl/PVA as a gel electrolyte. Moreover, PrGO/HKUST-1 composite with the longest charge/discharge time displayed excellent specific energy (21.0 Wh/kg), specific power (479.7 W/kg) and an outstanding cycle life (95.5%) over 4000 cycles. Thus, the PrGO/HKUST-1 can be recognized as a promising energy storage material.

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Section: Resultsmentioning

confidence: 99%

Facile synthesis of PEDOT-rGO/HKUST-1 for high performance symmetrical supercapacitor device

Mohanadas

Abdah

Azman

et al. 2021

Sci Rep

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“…On this account, the renewable and sustainable polymeric materials have become a mainstream research topic [1][2][3]. The transformation of the traditional petro-based plastics to bio-based polymeric materials not only brings a new blueprint for resource richness, but also provides benefits to our environment [4][5][6][7]. The sustainable poly (lactide) (PLA) is a bio-based thermoplastic polyester, which is polycondensated from lactic acid, and has a variety of carbohydrate sources, including corn, sugarcane or tapioca.…”

Section: Introductionmentioning

confidence: 99%

Fully Bio-Based Composites of Poly (Lactic Acid) Reinforced with Cellulose-Graft-Poly-(ε-Caprolactone) Copolymers

Gao¹,

Wu²,

Xie³

2023

Journal of Renewable Materials

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Due to the increasing demand for modified polylactide (PLA) meeting "double green" criteria , the research on sustainable plasticizers for PLA has attracted broad attentions. This study reported an open-ring polymerization method to fabricate cellulose (MCC)-g-PCL (poly (ε-caprolactone)) copolymers with a fully sustainable and biodegradable component. MCC-g-PCL copolymers were synthesized, characterized, and used as green plasticizers for the PLA toughening. The results indicated that the MCC-g-PCL derivatives play an important role in the compatibility, crystallization, and toughening of the PLA/MCC-g-PCL composites. The mechanical properties of the fully bio-based PLA/MCC-g-PCL composites were optimized by adding 15 wt% MCC-g-PCL, that is, the elongation at break was 22.6% (~376% higher than that of neat PLA), the tensile strength was 47.3 MPa (comparable to that of neat PLA), and the impact strength was 26 J/m (~130% higher than that of neat PLA). DSC results indicated that MCC-g-PCL reduced the T g of the PLA blend. When the addition amount was 15 wt%, the T g of the blend was 58.4°C. Compared with MCC, MCC-g-PCL polyester plasticizer has better thermal stability, T 5% (°C) can still be maintained above 300°C. The rheological results showed that MCC-g-PCL acted as a plasticizer, the introduction of PCL flexible chain increased the mobility of PLA molecular chain, and decreased the complex viscosity, storage modulus and loss modulus of PLA blends. The MCC-g-PCL derivatives , as a new green plastic additive, have shown an interesting prospect to prepare fully bio-based composites.

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“…In the last years, studies on the pyrolysis of residual Açaí seeds [8,11,[17][18][19][20][21][22][23][24][25][26][27][28][29], most of them aiming to produce a carbonaceous solid with activated carbon characteristics, were reported in the literature [8,[17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Improving the Bio-Oil Quality of Residual Biomass Pyrolysis by Chemical Activation: Effect of Alkalis and Acid Pre-treatment

Daniel¹,

Valois²,

Bremer³

et al. 2023

Preprint

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This work investigated the effect of temperature and acid or alkalis chemical activation by pyrolysis of Açaí seeds (Euterpe Oleraceae, Mart.) on the yield of bio-oil, hydrocarbon content of bio-oil, and chemical composition of aqueous phase. The experiments were carried out at 350, 400, and 450 °C and 1.0 atmosphere, KOH and HCl activation, in laboratory scale. The acidity of bio-oils and aqueous phases determined by AOCS methods, while the chemical composition of bio-oils and aqueous phase by GC-MS and FT-IR. The bio-char characterized by XRD. For the activation with KOH, the XRD analysis identified the presence of Kalicinite (KHCO3), the dominant crystalline phase in bio-char, while an amorphous phase was identified in bio-chars for the activation with HCl. The yield of bio-oil, for the pyrolysis of Açaí seeds activated with KOH, varied between 3.19 and 6.79 (wt.%), showing a smooth exponential increase with temperature. The acidity of bio-oil varied between 12.3 and 257.6 mgKOH/g, decreasing exponentially with temperature, while the acidity of aqueous phase lies between 17.9 and 118.9 mgKOH/g, showing and exponential decay behavior with temperature, demonstrating that higher temperatures favor not only the yield of bio-oil but also bio-oils with lower acidity. For the pyrolysis experiments activated with HCl, the yield of bio-oil varied between 2.13 and 3.37 (wt.%), decreasing linearly with temperature, while that of gas phase varied between 17.91 and 37.94 (wt.%), increasing linearly with temperature. The acidity of bio-oil varied between 127.1 and 218.5 mgKOH/g, increasing with temperature, showing that higher temperatures did not favor the yield of bio-oil and bio-oils acidity. For the chemical activation with KOH, the FT-IR analysis of bio-oils identified the presence of chemical groups characteristics of hydrocarbons and oxygenates, while that of aqueous phase only groups characteristics of oxygenates. For the chemical activation with HCl, the FT-IR analysis of bio-oil and aqueous phases identified only the presence of groups characteristics of oxygenates. For the experiments with KOH activation, the GC-MS of bio-oil identified the presence of hydrocarbons (alkanes, alkenes, cycloalkanes, cycloalkenes, and aromatics) and oxygenates (carboxylic acids, phenols, ketones, and esters). The concentration of hydrocarbons varied between 10.19 to 25.71 (area.%), increasing with temperature, while that of oxygenates from 52.69 to 72.15 (area.%), decreasing with temperature. For the experiments with HCl activation, the GC-MS of bio-oil identified only the presence of oxygenates. Finally, it can be concluded that chemical activation of Açaí seeds with KOH favors the not only the yield of bio-oil but also the content of hydrocarbons while activation with HCl produced bio-oils with only oxygen compounds.

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Hierarchical porous carbon derived from acai seed biowaste for supercapacitor electrode materials

Cited by 27 publications

References 44 publications

Facile synthesis of PEDOT-rGO/HKUST-1 for high performance symmetrical supercapacitor device

Facile synthesis of PEDOT-rGO/HKUST-1 for high performance symmetrical supercapacitor device

Fully Bio-Based Composites of Poly (Lactic Acid) Reinforced with Cellulose-Graft-Poly-(ε-Caprolactone) Copolymers

Improving the Bio-Oil Quality of Residual Biomass Pyrolysis by Chemical Activation: Effect of Alkalis and Acid Pre-treatment

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