Hierarchical porous graphene film: An ideal material for laser-carving fabrication of flexible micro-supercapacitors with high specific capacitance

Yun, Xiawei; Xiong, Zhiyuan; Tu, Long; Bai, Linqing; Wang, Xiaogong

doi:10.1016/j.carbon.2017.09.063

Cited by 49 publications

(28 citation statements)

References 70 publications

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“…Moreover, at the highest power density, the volumetric energy density of our CNS‐LSG electrodes are 7 times higher than the high‐power 3D‐ts‐graphene . It needs to be noted that CNS‐LSG exhibits the highest power performance among previously reported LSG electrodes derived from polyimides, graphene oxide, lignin, and carbon quantum dots (Table S2, Supporting Information) …”

mentioning

confidence: 83%

3D Laser Scribed Graphene Derived from Carbon Nanospheres: An Ultrahigh‐Power Electrode for Supercapacitors

et al. 2019

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Laser scribed graphene (LSG) electrodes hold great potential as supercapacitor electrodes. However, the rate performance of LSGs has been limited by the micropore‐dominated electrode structure. Here, a new method is proposed to prepare LSG electrodes with a 3D porous framework dominated by meso‐ and macro‐pores, a property that enables exceptional rate performance. The process uses amorphous carbon nanospheres (CNS) as precursors, which, after laser scribing, are transformed into highly turbostratic graphitic carbon electrodes (henceforth denoted as CNS‐LSG) with a 3D framework structure dominated by meso‐ and macro‐pores. When used as electrodes in conventional supercapacitor devices, the CNS‐LSG electrodes exhibit a high volumetric power density of 28 W cm−3, which is 28 times higher than that of current commercial activated carbon supercapacitors, and is the highest among all the reported laser scribed/induced graphene electrodes.

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confidence: 83%

3D Laser Scribed Graphene Derived from Carbon Nanospheres: An Ultrahigh‐Power Electrode for Supercapacitors

et al. 2019

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“…The small decreaseo fc apacitance can be explained by typical reasons such as carbon oxidation leading to pore blockage or irreversible electrolyte decomposition. [66] Figure 2d shows aC Vc urve recorded for two cells connectedi ns eries and aC Vc urve for as ingle cell at the same scan rate of 50 mV s À1 .C ompared with the potential window of as ingle cell, the potential window of two cells is expanded from 1t o2V, which is suitable for powering various small ap- Thus, experiments with two-electrode cells clearly demonstrate the applicability of the developed Chem-900-2 AC as aS Ce lectrode material. [66] Figure 2d shows aC Vc urve recorded for two cells connectedi ns eries and aC Vc urve for as ingle cell at the same scan rate of 50 mV s À1 .C ompared with the potential window of as ingle cell, the potential window of two cells is expanded from 1t o2V, which is suitable for powering various small ap- Thus, experiments with two-electrode cells clearly demonstrate the applicability of the developed Chem-900-2 AC as aS Ce lectrode material.…”

Section: Suitability Of the Obtained Ac For Practical Applicationsmentioning

confidence: 99%

“…[63][64][65] The voltage supplied by as ingle two-electrode cell with aqueous electrolyte is too low for practical applications, so it is necessary to connect at least two cells in series to produce a voltage on as cale conventionally required for smalla ppliances. [66] Figure 2d shows aC Vc urve recorded for two cells connectedi ns eries and aC Vc urve for as ingle cell at the same scan rate of 50 mV s À1 .C ompared with the potential window of as ingle cell, the potential window of two cells is expanded from 1t o2V, which is suitable for powering various small ap- (Figure 3b).…”

Section: Suitability Of the Obtained Ac For Practical Applicationsmentioning

confidence: 99%

Sustainable Utilization of Biomass Refinery Wastes for Accessing Activated Carbons and Supercapacitor Electrode Materials

et al. 2018

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Biomass processing wastes (humins) are anticipated to become a large-tonnage solid waste in the near future, owing to the accelerated development of renewable technologies based on utilization of carbohydrates. In this work, the utility of humins as a feedstock for the production of activated carbon by various methods (pyrolysis, physical and chemical activation, or combined approaches) was evaluated. The obtained activated carbons were tested as potential electrode materials for supercapacitor applications and demonstrated combined micro- and mesoporous structures with a good capacitance of 370 F g (at a current density of 0.5 A g ) and good cycling stability with a capacitance retention of 92 % after 10 000 charge/discharge cycles (at 10 A g in 6 m aqueous KOH electrolyte). The applicability of the developed activated carbon for practical usage as a supercapacitor electrode material was demonstrated by its successful utilization in symmetric two-electrode cells and by powering electric devices. These findings provide a new approach to deal with the problem of sustainable wastes utilization and to advance challenging energy storage applications.

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“…3D hierarchical porous materials are other candidates for MSC electrodes that provide both high conductivity and a large surface area in thick films. For example, porous graphene films can be prepared with tailored macro‐/mesoporous structures to facilitate ion diffusion and transportation during cycle time . 3D foam structure materials were prepared using sponge‐like templates on a large scale via different methods.…”

Section: Discussion and Outlookmentioning

confidence: 99%

On‐Chip Microsupercapacitors: From Material to Fabrication

Wang

Zhang

2019

Energy Tech

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Microsupercapacitors (MSCs) are integrated into microdevices or chip‐based systems to store energy and power the chip efficiently, as they present excellent performance capabilities including high power density, fast charge/discharge rate, and long cycle time. Providing sufficient surface area and high electric conductivity are effective ways to enhance ion diffusion and charge transportation in electrodes, which in turn leads to high performance behavior. Herein, the novel progress of on‐chip MSCs in the past few years ranging from active materials synthesis to high‐resolution fabrication techniques is summarized, and the strategies to enhance the performance of MSCs are focused upon. From conventional materials to nanocomposite hybrid structures, the main active materials for MSC electrodes and the related fabrication techniques are reviewed in detail according to their different electrochemical performance. It is concluded that hierarchical porous‐structured materials and high‐resolution fabrication processes are of great importance in constructing high‐performance devices, which also demonstrates the future developing direction of on‐chip energy devices. The new developments of fabrication technologies such as microfabrication, laser direct writing, and inkjet printing are also discussed to show their advantages in forming high‐performance electrodes.

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Hierarchical porous graphene film: An ideal material for laser-carving fabrication of flexible micro-supercapacitors with high specific capacitance

Cited by 49 publications

References 70 publications

3D Laser Scribed Graphene Derived from Carbon Nanospheres: An Ultrahigh‐Power Electrode for Supercapacitors

3D Laser Scribed Graphene Derived from Carbon Nanospheres: An Ultrahigh‐Power Electrode for Supercapacitors

Sustainable Utilization of Biomass Refinery Wastes for Accessing Activated Carbons and Supercapacitor Electrode Materials

On‐Chip Microsupercapacitors: From Material to Fabrication

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