Hierarchical porous carbon derived from eucalyptus-bark as a sustainable electrode for high-performance solid-state supercapacitors

Yadav, Nitish; Ritu, Ritu; Promila,; Hashmi, S.A.

doi:10.1039/c9se00812h

Cited by 58 publications

(15 citation statements)

References 74 publications

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“…11,14 In recent years, many groups reported highperformance EDLCs based on biomass-derived porous carbon electrodes. 11, 15,16 Liquid electrolytes, which are commonly used in the fabrication of supercapacitors, offer good electrode/electrolyte interfacial properties and high ionic conductivities of the order of 10 −3 −10 −2 S cm −1 , and hence, are able to provide high rate capability and capacitance to the devices. 17,18 However, they suffer from major disadvantages of corrosion, leakage, low gravimetric and volumetric energy and power densities, and bulky shapes/designs.…”

Section: ■ Introductionmentioning

confidence: 99%

High-Energy-Density Carbon Supercapacitors Incorporating a Plastic-Crystal-Based Nonaqueous Redox-Active Gel Polymer Electrolyte

Yadav

Hashmi

2021

ACS Appl. Energy Mater.

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Addition of redox additives in electrolytes to enhance the electrochemical activity at electrode–electrolyte interfaces is one of the prime approaches these days to develop high-energy-density supercapacitors. Here, we report an investigation on a quasi-solid-state supercapacitor, fabricated with a nonaqueous, gel polymer electrolyte (GPE) based on a mixture of a plastic crystal succinonitrile and an ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethyl sulfonyl) imide, added with a redox additive hydroquinone (HQ), immobilized in a polymer poly(vinylidine fluoride-co-hexafluoropropylene). The HQ-incorporated GPE is observed to be a freestanding, easily processible, and reusable film, showing excellent flexibility and thermal stability up to ∼100 °C. The high ionic conductivity (∼4.2 mS cm–1) and wide electrochemical stability window (∼5.0 V) through linear sweep voltammetry measurements make the optimum composition of GPE a potential electrolyte for high-energy-density supercapacitors. The symmetric supercapacitor coin cells have been fabricated with peanut shell-derived porous carbon electrodes separated by GPE films. The electrochemical activity due to the presence of HQ at carbon electrode–GPE interfaces introduces additional pseudocapacitance over the double-layer capacitance, leading to enhanced overall specific capacitance (289 F g–1), and hence corresponds to the high specific energy (∼40 Wh kg–1) and maximum power (∼20 kW kg–1). The capacitor cell shows prolonged cyclic profile up to ∼10 000 charge–discharge cycles with ca. 85–93% Coulombic efficiency.

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Section: ■ Introductionmentioning

confidence: 99%

High-Energy-Density Carbon Supercapacitors Incorporating a Plastic-Crystal-Based Nonaqueous Redox-Active Gel Polymer Electrolyte

Yadav

Hashmi

2021

ACS Appl. Energy Mater.

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“…Furthermore, very few studies are reported on using eucalyptus biomass, e.g., its seeds, leaves and barks as precursors for synthesizing SC materials. [ 35–37 ] These studies followed process involving conventional high activation temperature (800 °C or higher) by treating with ZnCl 2 or with KOH. Such high temperature process was primarily aimed for achieving high surface area which are favorable for charge accumulation process via ion accessibility to the active electrode materials.…”

Section: Introductionmentioning

confidence: 99%

Oxygen‐Rich Porous Activated Carbon from Eucalyptus Wood as an Efficient Supercapacitor Electrode

Atika

Dutta

2021

Energy Tech

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Herein, lignin‐rich KOH‐activated porous carbon from eucalyptus wood (named as PACE) is presented as an efficient electrode for supercapacitors (SCs). Compared with the most commonly used higher activation temperature, i.e., 800 °C with KOH (PACE‐800), a more efficient SC is developed by activating carbon with KOH at lesser temperature, i.e., 600 °C (PACE‐600). The high specific capacitance (i.e., 230 F g−1 at 1 A g−1 measured in a 2 m NaCl electrolyte) measured by galvanostatic charge–discharge (GCD) studies is not primarily due to larger surface area, but due to the inherent electron‐rich oxygen‐based functionalities that persist at the lower activation temperature, contributing to the hydrophilic nature to PACE‐600. The mechanism of the capacitive charge storage is deduced from electrochemical impedance spectroscopy (EIS). The application of PACE‐600 as a SC electrode is confirmed from insignificant loss in the specific capacitance after 10 000 charging–discharging cycles, recorded at 10 A g−1. Further, fabrication of higher‐voltage (1.6 V) symmetric SC PACE‐600//PACE‐600 in aqueous neutral electrolyte (2 m NaCl) is presented, which illuminates a red LED (1.8 V) for 1 min after charging for 5 s. The corresponding energy density is calculated to be 41 W h kg−1, and at a power density of 2396 W kg−1.

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“…Electrochemical impedance spectroscopy (EIS) measurements showed that the porous SPE has an ionic conductivity of ~10 −3 S cm −1 124 . Recently in 2020, Yadav et al 125 fabricated a symmetric SSC employing PVDF‐HFP porous SPE dipped in 0.5 M NaTFSI in EMIMTFSI and AC electrodes derived from the waste eucalyptus bark. The porous SPE was prepared by phase inversion using water as the non‐solvent bath and a solution of PVDF‐HFP in N‐Methyl‐2‐pyrrolidone (NMP).…”

Section: Electrolyte Materialsmentioning

confidence: 99%

Recent advances in solid‐state supercapacitors: From emerging materials to advanced applications

Akin

Zhou

2022

Intl J of Energy Research

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Hierarchical porous carbon derived from eucalyptus-bark as a sustainable electrode for high-performance solid-state supercapacitors

Abstract: Conversion of waste biomass into porous carbon, with improved energy and power, for use as an electrode for electrochemical double layer capacitors.

Cited by 58 publications

References 74 publications

High-Energy-Density Carbon Supercapacitors Incorporating a Plastic-Crystal-Based Nonaqueous Redox-Active Gel Polymer Electrolyte

High-Energy-Density Carbon Supercapacitors Incorporating a Plastic-Crystal-Based Nonaqueous Redox-Active Gel Polymer Electrolyte

Oxygen‐Rich Porous Activated Carbon from Eucalyptus Wood as an Efficient Supercapacitor Electrode

Recent advances in solid‐state supercapacitors: From emerging materials to advanced applications

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