Combination of redox-active natural indigo dye and bio-derived carbon from ridge gourd fruit for high-performance asymmetric supercapacitors

Brahma, Sumana; Ramanujam, Kothandaraman

doi:10.1007/s11581-021-04433-y

Cited by 7 publications

(4 citation statements)

References 68 publications

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“…The CV profiles were measured at a 20 mV s –1 scan rate in the potential range of −0.2 to 1.1 V. In the case of N-doped ACs, because of the presence of heteroatoms (N, O) and functional groups (like −COO– and −O−) on the carbon surface, a significant faradaic current was perceived in the voltage range of 0.5–0.6 V, which contributes to the C S,3E . In the case of AC-800, a small hump is observed in the potential range of 0.3–0.4 V because of the presence of −C=O groups . The positive shift of redox potential for NACs may be due to the faradaic reactions of pyridinic-N. All the NACs exhibit noticeably higher current density, signifying their more acceptability for the SC applications compared to AC-800.…”

Section: Resultsmentioning

confidence: 96%

“…In the case of AC-800, a small hump is observed in the potential range of 0.3− 0.4 V because of the presence of −C=O groups. 62 The positive shift of redox potential for NACs may be due to the faradaic reactions of pyridinic-N. All the NACs exhibit noticeably higher current density, signifying their more acceptability for the SC applications compared to AC-800. In particular, NAC (2:1) exhibits maximum current density, which may be due to maximum surface area.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

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Nitrogen-Doped High Surface Area Porous Carbon Material Derived from Biomass and Ionic Liquid for High-Performance Supercapacitors

Brahma

Ramanujam

Gardas

2022

Ind. Eng. Chem. Res.

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In this work, bioderived high surface area, porous activated carbons (ACs) are synthesized from dried Sterculia foetida (SF) fruit shells via KOH activation. Further, for highperformance supercapacitor (SC) application, the nitrogen-doped AC (NAC) has been derived by pyrolysis of a nitrogen-enriched ionic liquid (IL) and AC mixture. Herein, aprotic 1-ethyl-3-methyl-imidazolium dicyanamide ([EMIM][DCN]) IL is used as a nitrogen precursor. A series of NACs has been successfully developed by tuning the weight ratio of IL and AC. The optimized NAC (2:1) exhibits suitable graphitization degree, hierarchical micromesopores to ensure effective electrolyte diffusion, high surface area, and enhanced wettability. Further, in a three-electrode configuration, the NAC (2:1) electrode shows a high specific capacitance of 567 F g −1 at 0.5 A g −1 . Moreover, a symmetric two-electrode SC device was constructed, providing excellent specific energy of 13 Wh kg −1 at 300 W kg −1 . Overall, this study presents the positive aspects of an IL as a nitrogen precursor to synthesize high surface area NACs as a promising electrode material for SC applications.

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Section: Resultsmentioning

confidence: 96%

Section: Electrochemical Measurementsmentioning

confidence: 99%

Nitrogen-Doped High Surface Area Porous Carbon Material Derived from Biomass and Ionic Liquid for High-Performance Supercapacitors

Brahma

Ramanujam

Gardas

2022

Ind. Eng. Chem. Res.

Self Cite

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“…Despite the better ionic conductivity of KOH, listed in Table S2, capacitance values obtained in Na 2 SO 4 are higher at each specific current. This is probably attributed to the electrostatic repulsion between OH − and the deprotonated oxygen containing groups, −COO − and −RO − on the activated carbon surface, that hinder the formation of the double layer [50,51] …”

Section: Resultsmentioning

confidence: 99%

“…This is probably attributed to the electrostatic repulsion between OH À and the deprotonated oxygen containing groups, À COO À and À RO À on the activated carbon surface, that hinder the formation of the double layer. [50,51] Figure 8 also reports the capacitance values of an electrode with PVdF as binder. Despite the good stability in aqueous electrolyte, the electrodes with PVdF exhibited lower specific capacitance than electrodes with MA -modified chitosan as binder.…”

Section: Chemelectrochemmentioning

confidence: 99%

Sustainable Modification of Chitosan Binder for Capacitive Electrodes Operating in Aqueous Electrolytes

et al. 2023

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Biopolymers emerged in recent years as a promising alternative for a more sustainable manufacturing of electrochemical energy storage systems. In fact, for environmentally friendly aqueous systems, fluorinated polymers are usually adopted. For this reason, substituting these polymers with water processable binders could improve the overall environmental impact of the device. In this study, a low -cost and environmentally friendly modification of chitosan binder for self-standing activated carbon electrodes operating in Na ion, aqueous electrochemical double layer capacitors is reported and discussed.

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Asymmetric Supercapacitors based on 1,10‐phenanthroline‐5,6‐dione Molecular Electrodes Paired with MXene

Wei,

Meng,

Xiao

et al. 2023

ChemSusChem

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An efficient approach to increase the energy density of supercapacitors is to prepare electrode materials with larger specific capacitance and increase the potential difference between the positive and negative electrodes in the device. Herein, an organic molecular electrode (OME) is prepared by anchoring 1,10‐phenanthroline‐5,6‐dione (PD), which possesses two pyridine rings and an electron‐deficient conjugated system, onto reduced graphene oxide (rGO). Because of the electron‐deficient conjugated structure of PD molecule, PD/rGOs exhibit a more positive redox peak potential along with the advantages of high capacitance‐controlled behaviour and fast reaction kinetics. Additionally, the small energy gap between the lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) leads to increased conductivity in PD/rGO. To assemble the asymmetric supercapacitor (ASC), a two‐dimensional metal carbide, as known as MXene, with a chemical composition of Ti3C2Tx is selected as the negative electrode due to its exceptional performance, and PD/rGO‐0.5 is employed as the positive electrode. Consequently, the working voltage is expanded up to 1.8 V. Through further electrochemical measurements, the assembled ASC (PD/rGO‐0.5//Ti3C2Tx) achieves a remarkable energy density of 36.8 Wh kg‐1. Remarkably, connecting two ASCs in series can power 73 LEDs, showcasing its promising potential for energy storage applications.

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Combination of redox-active natural indigo dye and bio-derived carbon from ridge gourd fruit for high-performance asymmetric supercapacitors

Cited by 7 publications

References 68 publications

Nitrogen-Doped High Surface Area Porous Carbon Material Derived from Biomass and Ionic Liquid for High-Performance Supercapacitors

Nitrogen-Doped High Surface Area Porous Carbon Material Derived from Biomass and Ionic Liquid for High-Performance Supercapacitors

Sustainable Modification of Chitosan Binder for Capacitive Electrodes Operating in Aqueous Electrolytes

Asymmetric Supercapacitors based on 1,10‐phenanthroline‐5,6‐dione Molecular Electrodes Paired with MXene

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