Optimization of hierarchical porous carbon derived from a biomass pollen-cone as high-performance electrodes for supercapacitors

Hor, Abbas Ali; Hashmi, S.A.

doi:10.1016/j.electacta.2020.136826

Cited by 80 publications

(46 citation statements)

References 56 publications

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“…The capacitance values were improved with the increment of surface area associated with KOH activation. The maximum capacitance value of 200 F g −1 was observed at a surface area of 2500 m 2 g −1 and compares favorably to respective values from graphene materials reported earlier [46,47]. However, further enhancement of the surface area was ineffective for the improvement of the capacitance value.…”

Section: Electrochemical Performancesupporting

confidence: 81%

Assessment of Biochar Produced by Flame-Curtain Pyrolysis as a Precursor for the Development of an Efficient Electric Double-Layer Capacitor

et al. 2021

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Pine tree biochar produced by flame-curtain pyrolysis, an inexpensive and simple pyrolysis methodology, was used as the starting material for KOH-activated carbon. Flame-curtain pyrolysis is a simple, low-technology methodology that can be performed by non-specialized personnel. The elemental analysis of the biochars highlighted the high reproducibility of the process. The N2 adsorption isotherms indicated that KOH activation was effective for the preparation of high-surface-area activated carbons from the biochar. The BET specific surface area increased with the quantity of KOH added in the activation process, achieving a maximum value of 3014 m2 g−1 at 85.7 wt.% of KOH addition. The adsorption isotherms of all samples were IUPAC type I, establishing their microporous nature. Results from the Mikhail–Brunauer (MP) method and αs plot indicated that the pore size distribution became wider and the pore volume increased as the KOH content increased. The measured capacitance values followed the same dependence on KOH content. The maximum capacitance value at 1 mV s−1 was determined as 200.6 F g−1 for the sample prepared at 75 wt.% of KOH addition. Therefore, pine tree biochar prepared by simple pyrolysis equipment is a suitable precursor for the development of an electric double-layer capacitor.

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Section: Electrochemical Performancesupporting

confidence: 81%

Assessment of Biochar Produced by Flame-Curtain Pyrolysis as a Precursor for the Development of an Efficient Electric Double-Layer Capacitor

et al. 2021

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“…However, no report of using dried banana leaf samples for this exact investigation has been recorded. Furthermore, KOH and ZnCl 2 impregnated is a technique that is often used to obtain porous carbon‐based on biomass [36] . This impregnation can more effectively decompose complex compounds of lignocellulosic biomass, including hemicellulose, cellulose, and lignin to produce high pure carbon.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh Capacitive Supercapacitor Derived from Self‐Oxygen Doped Biomass‐Based 3D Porous Carbon Sources

2021

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This study reported an ultrahigh specific capacitance of a supercapacitor, using self‐oxygen doped 3D‐porous carbon derivatives from dried banana leaves. The samples were synthesized by ZnCl2 impregnation at different temperature pyrolysis of 700–900 °C. Furthermore, the overall process significantly increased the specific surface area from 429.6 to 860.4 m2 g−1 followed by the formation of 3D‐interconnected pores structures. Unexpectedly, the activated carbon demonstrated high‐level oxygen dopants between 9.47–12.45%. These valuable physical features showed a ultrahigh specific capacitance of 401 F g−1 and 235 F g−1 in a two‐electrode configuration system, using electrolytes of 1 M H2SO4 and 6 M KOH, respectively. Also, electrochemical properties were evaluated in the form of pellet binder‐free materials. Porous carbon sources were known to generate extensive specific energy of 55.69 Wh kg−1 and specific power of 200.09 W kg−1. Based on the technique and results, the use of hierarchical 3D‐porous carbon derivatives is validated as robust electrode materials in developing high‐performance electrochemical energy storage.

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“…The synthesis of rGO/CNT composite electrode was manufactured through the sol–gel technique 47 . The obtained synthesis materials like rGO and CNT powders were subjected to dry overnight underneath at room temperature in the vacuum oven at 50°C for moisture‐free and dust‐free.…”

Section: Methodsmentioning

confidence: 99%

“…The preparation of the electrode material consisting of the active carbon (rGO/CNT) with conductive additive containing acetylene black (AB) and (PVdF‐HFP) as a polymer binder in the different weight ratio of 80:10:10 and mixing using a mortar pestle. The dropwise used of acetone to form the slurry type homogeneous mixture; the resulting product was than cast on graphite sheets of thickness ∼250 μm (1 × 1 cm 2 ) size and work as current collectors 47 . After coating, the synthesized electrodes were made to dry at ∼70°C in a vacuum for 10–14 hours.…”

Section: Methodsmentioning

confidence: 99%

High performance of the sodium‐ion conducting flexible polymer blend composite electrolytes for electrochemical double‐layer supercapacitor applications

et al. 2022

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Herein, we present the synthesis of a nanocomposite blend of polyvinyl alcohol (PVA), polyethylene glycol (PEG), sodium nitrate (NaNO3), and various weight percent of nanofillers, BaTiO3, using a simple standard solution casting technique. The prepared nanocomposites are characterized in detail via techniques such as X‐ray diffraction technique, field‐emission scanning microscope, FTIR, and Raman spectra for confirming the crystal structure, morphology, and chemical bond formation within the samples, respectively. The suitable ionic conductivity of prepared samples is in the range of 10−4–10−8 S/cm at room temperature. Further, its maximum electrochemical stability window is ~4.1 V, and the ionic transference number is about 0.96 (15 wt%) at room temperature. The results associated with the optimized polymer nanocomposite motivated us to check its practical applicability for supercapacitors. The cyclic voltammetry of the fabricated cell based on optimized polymer as separator cum electrolyte appears as a distorted rectangle with no redox peaks. The cell charge storage mechanism is explored to be the electric double layer (EDLC) in nature. The maximum specific capacitance exhibited by the cell is nearly 4.4 F/g at a scan rate of 3 mV/s. The energy and power densities delivered by the same cell are equal to 27.7 W h kg−1 and 9972 W kg−1, respectively, which sustain for 100 cycles. The results of the designed cell reveal that both blend polymer composite electrolyte films and the composite electrode can be implemented to be used for EDLC supercapacitor.

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Optimization of hierarchical porous carbon derived from a biomass pollen-cone as high-performance electrodes for supercapacitors

Cited by 80 publications

References 56 publications

Assessment of Biochar Produced by Flame-Curtain Pyrolysis as a Precursor for the Development of an Efficient Electric Double-Layer Capacitor

Assessment of Biochar Produced by Flame-Curtain Pyrolysis as a Precursor for the Development of an Efficient Electric Double-Layer Capacitor

Ultrahigh Capacitive Supercapacitor Derived from Self‐Oxygen Doped Biomass‐Based 3D Porous Carbon Sources

High performance of the sodium‐ion conducting flexible polymer blend composite electrolytes for electrochemical double‐layer supercapacitor applications

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