Hierarchical porous carbon derived from tea waste for energy storage applications: Waste to worth

Ratnaji, T.; Kennedy, L. John

doi:10.1016/j.diamond.2020.108100

Cited by 54 publications

(15 citation statements)

References 22 publications

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“…This condition generates allotropes with completely separate properties as well as confirms the potential application of porous carbon biomass in high‐energy supercapacitor electrodes. Previous investigations have also recorded several biomass species as precursors to porous carbon materials, including tea waste, [8] grape marcs, [9] Juncus effuses, [10] and jengkol shell [11] . Moringa Olifiera ‐based activated carbon produced a high surface area of 2,250 m 2 g −1 and specific energy of 25.8 Wh kg −1 , approximately three times the earlier report [12] .…”

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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Section: Introductionmentioning

confidence: 99%

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

2021

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“…As a research hotspot with both bionic structure and high‐efficiency functionalization, hierarchical cellular materials have the advantages of large specific surface area and high mass transfer efficiency due to their highly interconnected system from macropores to micropores. [ 1 ] These features that can be developed and broadened make hierarchical cellular materials show tremendous application prospects in catalyst, [ 2 ] energy storage, [ 3 ] high‐performance batteries, [ 4 ] and so on. The reported fabrication methods for hierarchical cellular materials such as templating method [ 5 ] and sol–gel methods [ 6 ] often involve harsh preparation environment, high solvent consumption, and complex treatment.…”

Section: Introductionmentioning

confidence: 99%

Dimensional Accuracy Control and Compressive Property of Microcellular Polyetherimide Honeycomb Foams Manufactured by an In Situ Foaming Fused Deposition Modeling Technology

Zhai

et al. 2021

Adv Eng Mater

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The microcellular honeycomb foams can be manufactured via fused deposition modeling (FDM) technology. However, the process often involves complicated pre/post‐treatment. Herein, a novel in situ foaming FDM technology is developed to efficiently fabricate the microcellular polyetherimide (PEI) honeycomb foams with various lattice structures. The extremely low gas diffusivity endows the CO2‐saturated PEI filament with a long‐time printing ability and well printing performance, which is characterized by a long printable time up to 7 days and the formation of microcellular structure within the deposited foam strands. The printed PEI foam parts possess high dimensional accuracy with a relative accuracy (δR) of 1.3–6.4% at the external regions and low internal accuracy with δR of 27.5–48.8%, resulting from the increased nozzle expansion and reduced melt viscosity. An accuracy correction based on the nozzle expansion is effective to improve the dimensional accuracy of the foam parts. The high accuracy control of macro/microstructure and the advantages of green processing and long‐time printing make the in situ foaming FDM technology show great application prospects in the fabrication of hierarchical cellular materials.

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“…Black et al simulated the charge accumulation behavior in different pores and concluded that electrodes with multiscale pores were conducive to charge accumulation. Recent research has also shown that hierarchical porous carbons with appropriate micropores, mesopores, and macropores exhibit better capacitance characteristics and rate performances. − Generally, micropores (<2 nm) improve the specific capacitance by providing a large SSA for ion adsorption. Mesopores (2–50 nm) are rapid transport channels for electrolyte ions to reach the interior of carbon materials, and macropores (>50 nm) act as ion-buffering reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Chitosan-Based Synthesis of O, N, and P Codoped Hierarchical Porous Carbon as Electrode Materials for Supercapacitors

Zhang

et al. 2021

Energy Fuels

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Reasonable porous structure and proper heteroatom doping have great influences on electrode materials for supercapacitors. Herein, O, N, and P codoped hierarchical porous carbon (ONPC) was synthesized through a one-pot carbonization−activation strategy by using chitosan as the carbon precursor, phosphoric acid as the activator, and melamine foam as the skeleton. The use of melamine foam facilitated the formation of an interconnected carbon framework and introduced more nitrogen functional groups. Owing to the hierarchical pore structure, large surface area (1588 m 2 g −1 ), and significant heteroatom contents of O (8.61%), N (7.95%), and P (1.34%) in the carbon matrix, the 700 °C carbonized sample ONPC-700 had a specific capacitance of 230 F g −1 at 0.2 A g −1 . A high energy density of 7.5 Wh kg −1 at 100 W kg −1 was achieved for the supercapacitor fabricated with two identical ONPC-700 electrodes. Furthermore, the capacitance retention of the device was evaluated to be as high as 86.53% after 8000 cycles.

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Hierarchical porous carbon derived from tea waste for energy storage applications: Waste to worth

Cited by 54 publications

References 22 publications

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

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

Dimensional Accuracy Control and Compressive Property of Microcellular Polyetherimide Honeycomb Foams Manufactured by an In Situ Foaming Fused Deposition Modeling Technology

Chitosan-Based Synthesis of O, N, and P Codoped Hierarchical Porous Carbon as Electrode Materials for Supercapacitors

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