Recent Advances in Biochar Modification for Energy Storage in Supercapacitors: A Review

Singhal, Kavita; Mehtab, Sameena; Upreti, Bharat Bhushan; Zaidi, M. G. H.

doi:10.5185/amlett.2021.021599

Cited by 3 publications

(1 citation statement)

References 51 publications

(63 reference statements)

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“…Supercapacitors (SCs) have gained significant attention as energy storage devices due to their high power density and cycling stability, showing promise for various daily life applications. − However, their relatively low energy densities have constrained their practical usability. Addressing this limitation is crucial to meet the growing energy demands of the electronic industry. − The energy density ( E ) of a supercapacitor is determined by the following equation E = 1 2 C V 2 where C is the capacitance and V is the working voltage range .…”

Section: Introductionmentioning

confidence: 99%

Laser-Irradiated B-Doped Graphene Showing Enhanced Capacitance in a Fluorine-Free Water-in-Bisalt Electrolyte

Upreti,

Dey

2023

ACS Sustainable Chem. Eng.

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Research progress on aqueous supercapacitors with carbon-based nanomaterials has surged significantly with the development of energy storage technology due to their low-cost synthesis methodology, environmental compatibility, and safety. Recently, water-in-salt (WIS) and water-in-bisalt (WIBS) electrolytes have gained substantial attention owing to their wide electrochemical stability window (ESW), surpassing that of conventional aqueous electrolytes (approximately 1.23 V). This study investigates the integration of laser-irradiated (LI) boron-doped graphene (BG) electrodes with a WIBS electrolyte (12 m NaNO 3 + 0.1 m KNO 3 ). Specifically, the utilization of a WIS environment with NaNO 3 and KNO 3 ions results in the formation of a thinner electric double layer (EDL), effectively enhancing capacitance while preserving the expansive ESW of 2 V. The observed improved specific capacitance using the WIBS electrolyte is 102.45 mF cm −2 at a current density of 0.2 mA cm −2 . Remarkably, the performance of the symmetric full-cell supercapacitor exhibits exceptional cycling stability over 8000 cycles, maintaining nearly 100% Coulombic efficiency throughout the cycling, along with approximately 90% capacitance retention up to 6000 cycles and around 79% retention after 8000 cycles. Furthermore, the B-doped electrode immersed in the WIBS electrolyte attains a notable energy density of 56.916 mWh cm −2 and a power density of 6 kW cm −2 . This investigation underscores the potential of LI-BG electrodes coupled with WIBS electrolytes in significantly elevating the energy density and overall performance in aqueous supercapacitor systems.

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Section: Introductionmentioning

confidence: 99%

Laser-Irradiated B-Doped Graphene Showing Enhanced Capacitance in a Fluorine-Free Water-in-Bisalt Electrolyte

Upreti,

Dey

2023

ACS Sustainable Chem. Eng.

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Co-pyrolysis of pinewood and HDPE: pyrolysis characteristics and kinetic behaviors study

Luo,

Wang,

Zhao

et al. 2023

International Journal of Low-Carbon Technologies

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Co-pyrolysis of lignocellulosic biomass and hydrogen-rich petroleum-based polyolefin plastics is a promising to way to improve bio-oil quality and alleviate the waste plastic pollution issues. In this study, co-pyrolysis of pinewood and HDPE was systematically investigated. The addition of HDPE decreased yield of char and gas while increased that of bio-oil, enhancing the selectivity to alcohols and hydrocarbons. The most obvious synergistic effect was observed at the HDPE mixing proportion of 0.25, at which hydrocarbon selectivity derived from co-pyrolysis experiments was 41.19% higher than the calculated weighted average values. As pyrolysis temperature increased from 500°C to 700°C, the yield of bio-oil from co-pyrolysis at the HDPE mixing proportion of 0.25 decreased from 69.11 wt.% to 50.33 wt.%, alkanes selectivity decreased from 27.41% to 3.67% and olefins selectivity increased from 14.96% to 47.12%. At 700°C, aromatics started to produce with a selectivity of 15.50%. The surface morphologies of char were not significantly affected by the HDPE mixing proportion and pyrolysis temperature. The thermogravimetric analysis results revealed that the global co-pyrolysis process can be divided into two major degradation stages, based on which multi-step method was adopted to analyze the kinetics of the process. The average apparent activation energies of stage I and stage II were 167.73 kJ/mol and 274.74 kJ/mol, respectively. The results from this work provide a theoretical guide for further development of co-pyrolysis of pinewood and high-density polyethylene (HDPE).

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Electrochemical Energy Storage Capacity of Surface Engineered Renewable Carbon Derived from Industrial Tea Waste by HNO3 and K2CO3

Akgül

Oskay

Buldu-Akturk

et al. 2023

Surf. Engin. Appl.Electrochem.

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Recent Advances in Biochar Modification for Energy Storage in Supercapacitors: A Review

Cited by 3 publications

References 51 publications

Laser-Irradiated B-Doped Graphene Showing Enhanced Capacitance in a Fluorine-Free Water-in-Bisalt Electrolyte

Laser-Irradiated B-Doped Graphene Showing Enhanced Capacitance in a Fluorine-Free Water-in-Bisalt Electrolyte

Co-pyrolysis of pinewood and HDPE: pyrolysis characteristics and kinetic behaviors study

Electrochemical Energy Storage Capacity of Surface Engineered Renewable Carbon Derived from Industrial Tea Waste by HNO3 and K2CO3

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