Optimising the fabrication of 3D binder-free graphene electrode for electrochemical energy storage application

Agudosi, Elochukwu Stephen; Abdullah, Ezzat Chan; Numan, Arshid; Khalid, Mohammad; Mubarak, Nabisab Mujawar; Aid, Siti Rahmah; Omar, Nurizan

doi:10.1016/j.surfcoat.2021.127080

Cited by 13 publications

(3 citation statements)

References 35 publications

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“…Such flexible electrodes do not require binders instead, a strong physical or chemical bond between the electrode materials and the current collector is used to assure their performance. [66] The development of self- [49] Copyright (2017), with permission from John Wiley and Sons], (d) representation of fiber shaped FSC, and e) Images of fiber shaped FSC device. standing films from active materials employing electro-spinning, electrochemical deposition, vacuum filtering techniques results in outstanding electrochemical and mechanical stability.…”

Section: Flexible Electrode Fabrication Methodsmentioning

confidence: 99%

“…To construct FSCs, novel SC electrodes, specifically binder‐free SC electrodes are required. Such flexible electrodes do not require binders instead, a strong physical or chemical bond between the electrode materials and the current collector is used to assure their performance [66] . The development of self‐standing films from active materials employing electro‐spinning, electrochemical deposition, vacuum filtering techniques results in outstanding electrochemical and mechanical stability [67] .…”

Section: High‐performance Fscsmentioning

confidence: 99%

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Nanotechnology in Advanced 2D and 3D Nanostructured Transition Metal Oxide Based Flexible Supercapacitors: A Review

Worku,

Palaniyandy,

Srinivasu Vallabhapurapu

et al. 2023

ChemElectroChem

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Flexible supercapacitors (FSCs) can be power sources for the next generation of flexible and wearable electronic devices. Recent breakthroughs in nanotechnology have opened new opportunities in the energy industry to improve the performance of FSCs by providing high energy density, high power density, and excellent flexibility. Due to their higher surface area, larger contact area between electrode and electrolyte, and shorter ion‐diffusion pathways, low‐dimensional materials with a wide variety of morphologies play a key role in improving the performance of FSCs. Especially nanostructured transition metal oxides (TMOs) are of great interest for the application of SCs due to their superior specific capacitance, high energy density, high redox reversibility, easy availability, and environmental safety. However, the low electrical conductivity, low power density, poor cycle stability, and rigid properties of TMOs have limited their wide applications for FSCs. Therefore, the fabrication of nanostructured TMO‐based composites with conducting carbon, polymers, and other materials with large surface areas, pore and layer structures, etc., improves the electrical and mechanical properties. This review provides a brief overview of the current developments in 2D and 3D TMO‐based nanomaterials and their preparation techniques, design, structure, and fundamental understanding of nanoscale capacitive behavior for advanced flexible energy storage applications.

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Section: Flexible Electrode Fabrication Methodsmentioning

confidence: 99%

Section: High‐performance Fscsmentioning

confidence: 99%

Nanotechnology in Advanced 2D and 3D Nanostructured Transition Metal Oxide Based Flexible Supercapacitors: A Review

Worku,

Palaniyandy,

Srinivasu Vallabhapurapu

et al. 2023

ChemElectroChem

View full text Add to dashboard Cite

show abstract

“…This test focuses on the residual content of C and O elements and the migration of elements in the tire. XPS can characterize the element valence in graphene and can be used as an auxiliary means to determine the content of oxygen defects [38][39][40][41].…”

Section: X-ray Photoelectron Spectroscopy (Xps) Of Raw Materials and ...mentioning

confidence: 99%

Microwave Preparation of Porous Graphene from Wasted Tires and Its Pyrolysis Behavior

Liu

Yuwen

et al. 2022

Waste Biomass Valor

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Nowadays, most waste tires are disposed of by direct combustion or via land ll, which inevitably creates a large volume of waste. However, the soft carbon found in tires can be an excellent precursor in the preparation of graphene. In this study, waste tires were mixed with potassium hydroxide (KOH) and heated in a microwave environment to be converted rapidly into porous graphene, a process having no complicated pre-processing. Moreover, the processes, tools, and chemical reagents are distinct and inexpensive. Thermogravimetric analysis and dielectric property testing of the tires and mixtures were conducted to study their pyrolysis behavior and catalytic reactions. It was found that when the temperature reached more than 750°C, potassium ions and carbon underwent a reduction reaction to generate potassium vapor, which catalyzed the carbon in the tires into porous graphene, and that microwave heating could shorten the heating time. Simultaneously, the carbon in the tire could be sheared smaller and thinner during the rapid pyrolysis and volatilization of the gas, bene tting the graphene production. The products of the mixed materials were then characterized and analyzed at different holding temperatures and times. As the holding time increased, the degree of graphitization of the products increased, the number of layers increased slightly, and the impurity elements were completely removed from the products.

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On the Road to the Frontiers of Lithium‐Ion Batteries: A Review and Outlook of Graphene Anodes

Sun

et al. 2023

Advanced Materials

128

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Graphene with fascinating physicochemical properties has been regarded as one of the most promising candidates to substitute the commercial graphite anode for next-generation lithium-ion batteries (LIBs). [1] As originally suggested by Dahn's group, Li ions can be adsorbed on each side of graphene, forming a Li 2 C 6 stoichiometry with a theoretical specific capacity of 744 mAh g −1 , twice that of graphite (372 mAh g −1 of the first-stage LiC 6 intercalation compound). [2] However, in situ Raman spectroscopy reveals that it is difficult to achieve high Li coverage on graphene because of the low binding energy of Li with carbon and the strong Coulombic repulsion between the adsorbed Li ions. [3] Using density functional theory (DFT) calculations, Lee et al. also found that Li cannot reside on the surface of pristine graphene since its adsorption energy is positive for the entire range of Li content. [4] Therefore, the Li storage capacity of pristine graphene is far from its theoretical value, and is even inferior to that of graphite. Accordingly, it was proposed that defective graphene presents superior Li adsorption because of the increased charge transfer between Li and the defects, and moreover, the specific capacity rises with the increase of defects densities. [5] In the case of the maximum divacancy defect density, the Li storage capacity can reach up to 1675 mAh g −1 . In this regard, reduced graphene oxide (rGO), a form of graphene prepared by a chemical oxidation-exfoliation-reduction process, has been proven to be a potential anode by virtue of its abundant defects and the residual O-containing functional groups. [6] On the other hand, rGO also exhibits the advantages of mass production from the reduction of graphene oxide (GO) with contained costs, which is an essential step for practical applications. [7] As a result, rGO anode is more frequently studied as compared to its pristine graphene counterpart.The groundbreaking work of graphene anodes was reported in 2008 by Honma's group, who demonstrated that the incorporation of carbonaceous materials, i.e., carbon nanotubes (CNTs) and fullerenes (C 60 ), into graphene sheets can efficiently expand the interlayer spacing, thus higher Li storage capacities. [8] Soon Graphene has long been recognized as a potential anode for next-generation lithium-ion batteries (LIBs). The past decade has witnessed the rapid advancement of graphene anodes, and considerable breakthroughs are achieved so far. In this review, the aim is to provide a research roadmap of graphene anodes toward practical LIBs. The Li storage mechanism of graphene is started with and then the approaches to improve its electrochemical performance are comprehensively summarized. First, morphologically engineered graphene anodes with porous, spheric, ribboned, defective and holey structures display improved capacity and rate performance owing to their highly accessible surface area, interconnected diffusion channels, and sufficient active sites. Surface-modified graphene anodes with less aggreg...

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Optimising the fabrication of 3D binder-free graphene electrode for electrochemical energy storage application

Cited by 13 publications

References 35 publications

Nanotechnology in Advanced 2D and 3D Nanostructured Transition Metal Oxide Based Flexible Supercapacitors: A Review

Nanotechnology in Advanced 2D and 3D Nanostructured Transition Metal Oxide Based Flexible Supercapacitors: A Review

Microwave Preparation of Porous Graphene from Wasted Tires and Its Pyrolysis Behavior

On the Road to the Frontiers of Lithium‐Ion Batteries: A Review and Outlook of Graphene Anodes

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