Advances in green synthesis and applications of graphene

Yu, Qi; Jiang, Jianchao; Jiang, Liyun; Yang, Qingqing; Yan, Ning

doi:10.1007/s12274-021-3336-9

Cited by 28 publications

(9 citation statements)

References 231 publications

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“…[129][130][131] However, it occurs that graphene sheets will be tightly restacked and the SSA dramatically reduces due to strong π-π interaction between graphene layers, which greatly blocks the transportation and storage of electrolyte ions and finally impacts electrochemical performances of SCs. To address these shortcomings, great efforts have been made from many aspects, including graphene preparation methods, [132][133][134] chemical functionalization, and so on. Spectacularly, great achievements have been made in graphene materials and graphene-based composites for high-performance SC electrodes.…”

Section: Graphene-based Electrode Materialsmentioning

confidence: 99%

Carbon Nanomaterials‐Enabled High‐Performance Supercapacitors: A Review

Zhao

Liu

et al. 2022

Adv Energy and Sustain Res

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Supercapacitors (SCs), an important kind of electrochemical energy storage device, are featured with high power density, rapid charging and discharging, and ultralong cycling lifespan and have been widely applied in multiscenario energy storage and output systems, such as portable consumer electronics, electric vehicles, and reservoir setups for green and sustainable energy resources. Among their components, electrode materials are of primary importance in dictating their performances. Owing to good electric conductivity, achievably large specific surface area, low cost, chemical stability, and easy loading with other electrochemically active species, various carbon nanomaterials, including activated carbons, carbon nanotubes, graphene, and other porous carbons, are promising electrode materials in the fabrication of high-performance SCs. In fact, the past decade has witnessed enormous efforts in the development of highperformance carbon-based SC electrode materials and great progresses achieved in the field. In this review, recent advances on these carbon-based SCs are summarized through a number of selected representative works. In each one, the unique preparation method, structural features, and their correlations to electrochemical properties and final SC performance are presented and discussed. At the end of the review, the challenges and future developing prospects are briefly outlined.

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Section: Graphene-based Electrode Materialsmentioning

confidence: 99%

Carbon Nanomaterials‐Enabled High‐Performance Supercapacitors: A Review

Zhao

Liu

et al. 2022

Adv Energy and Sustain Res

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“…Graphene, as the thinnest two-dimensional material with a honeycomb lattice nanostructure that contains numerous double bonds, has been attracting prevalent attention [ 1 , 2 ] in the fields of electronics [ 3 , 4 ], thermodynamics [ 5 , 6 , 7 , 8 ], mechanics [ 9 , 10 , 11 ], optics [ 12 , 13 , 14 ] and chemistry [ 15 , 16 , 17 ]. Many experimental studies have been carried out focusing on synthesizing macro graphene and graphene-based materials via various methods to improve the electrical and mechanical properties for potential applications [ 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. For instance, Zhou et al obtained Mxene-functionalized rGO with high compactness and toughness through Ti-O-C covalent bonding to improve the poor mechanical properties of graphene [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Compressed Graphene Assembled Film with Tunable Electrical Conductivity

et al. 2023

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Graphene and graphene-based materials gifted with high electrical conductivity are potential alternatives in various related fields. However, the electrical conductivity of the macro-graphene materials is much lower than their metal counterparts. Herein, we improved the electrical conductivity of reduced graphene oxide (rGO) based graphene assembled films (GAFs) by applying a series of compressive stress and systematically investigated the relationship between the compressive stress and the electrical conductivity. The result indicates that with increasing applied compressive stress, the sheet resistance increased as well, while the thickness decreased. Under the combined effect of these two competing factors, the number of charge carriers per unit volume increased dramatically, and the conductivity of compressed GAFs (c-GAFs) showed an initial increasing trend as we applied higher pressure and reached a maximum of 5.37 × 105 S/m at the optimal stress of 450 MPa with a subsequent decrease with stress at 550 MPa. Furthermore, the c-GAFs were fabricated into strain sensors and showed better stability and sensitivity compared with GAF-based sensors. This work revealed the mechanism of the tunable conductivity and presented a facile and universal method for improving the electrical conductivity of macro-graphene materials in a controllable manner and proved the potential applications of such materials in flexible electronics like antennas, sensors, and wearable devices.

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“…Key to this, is that the process for making graphene is as environmentally sustainable as possible, following the principles of green chemistry. 9 More environmentally sustainable graphene is typically synthesised by top-down approaches, where bulk graphite is used, rather than bottom-up approaches which require carbon feedstocks to be converted to graphene, typically involving high energy usage, specialised equipment and difficulty for the scale up of these methods. 10 A common method used to produce graphene involves the chemical oxidation of graphite into graphite oxide, which can then be exfoliated into graphene oxide (GO).…”

Section: Introductionmentioning

confidence: 99%