A flexible graphene/multiwalled carbon nanotube film as a high performance electrode material for supercapacitors

Lu, Xiangjun; Dou, Hui; Gao, Bo; Yuan, Changzhou; Yang, Sudong; Hao, Liang; Shen, Laifa; Zhang, Xiaogang

doi:10.1016/j.electacta.2011.03.066

Cited by 250 publications

(163 citation statements)

References 60 publications

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“…Furthermore, this strategy is known to improve mechanical properties of films containing layered materials and may assist with electrolyte accessibility by preventing restacking of adjacent sheets. 27,71 …”

Section:  mentioning

confidence: 99%

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

et al. 2014

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Here we demonstrate significant improvements in the performance of supercapacitor electrodes based on 2D MnO2 nano-platelets by the addition of carbon nanotubes. Electrodes based on MnO2 nano-platelets do not display high areal capacitance because the electrical properties of such films are poor, limiting the transport of charge between redox sites and the external circuit.In addition, the mechanical strength is low, limiting the achievable electrode thickness, even in the presence of binders. By adding carbon nanotubes to the MnO2-based electrodes, we have increased the conductivity by up to eight orders of magnitude, in line with percolation theory.The nanotube network facilitates charge transport, resulting in large increases in capacitance, especially at high rates, around 1 V/s. The increase in MnO2 specific capacitance scaled with nanotube content in a manner fully consistent with percolation theory. Importantly, the mechanical robustness was significantly enhanced, allowing the fabrication of electrodes that were 10 times thicker than could be achieved in MnO2-only films. This resulted in composite films with areal capacitances up to 40 times higher than could be achieved with MnO2-only electrodes.

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Section:  mentioning

confidence: 99%

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

et al. 2014

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“…[63] When prepared as flexible electrodes, such composites generally have better performance than either of CNTs or graphene alone, and a remarkable specific capacitance of 265 F/g was achieved for electrodes with 16 wt% of multiwalled carbon nanotubes (Figure 4). [37] In another similar study, 326 F/g was obtained for composite electrodes with 10% CNTs, which is also substantially higher than pure CNTs and graphene electrodes. [64] Composite flexible electrodes other than graphene/ CNTs were also actively studied.…”

Section: Flexible Electrodes Based On Composite Carbonmentioning

confidence: 70%

Carbon Nanomaterials for Flexible Energy Storage

Cheng¹,

Liu²

2013

Materials Research Letters

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Flexible energy storage systems have substantial inherent advantages in comparison with many currently employed systems due to improved versatility, performance and potentially lower cost. The research within this field is currently undergoing tremendous developments as new materials, composites and large-scale assembly strategies are being developed. In this review, we summarize recent progresses toward the development of flexible electrodes based on carbonaceous nanomaterials with particular emphasis on rational electrode design. Strategies to assemble flexible electrodes, both with and without inert mechanical supports, are reviewed and compared. Depending on their composition, the flexible electrodes can be used in important energy storage systems including supercapacitors and lithium ion batteries. The trend on future developments is also analyzed.

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“…[98][99] The MWCNTs in the hybrid films not only efficiently increase the basal spacing but also bridge the defects for electron transfer between RGO sheets, increasing electrolyte/electrode contact area and facilitating transportation of electrolyte ion and electrons to the inner region of electrodes. The rGO/MWCNT films possesses a specific capacitance of 265 F/g at 0.1 A/g and a good rate capability (49% capacity retention at 50 A/g), and displays an excellent specific capacitance retention of 97% after 2000 continuous charge/discharge cycles.…”

Section: Cnt-graphene Compositesmentioning

confidence: 99%

“…The rGO/MWCNT films possesses a specific capacitance of 265 F/g at 0.1 A/g and a good rate capability (49% capacity retention at 50 A/g), and displays an excellent specific capacitance retention of 97% after 2000 continuous charge/discharge cycles. [98] CNTs can form stable aqueous through charge stabilization after acid oxidation, leading to a negative charge on the backbone of the CNT. Stable aqueous dispersions of positively charged polymer-modified graphene sheets were obtained via the in situ reduction of exfoliated graphite oxides in the presence of cationic poly(ethyleneimine) (PEI).…”

Section: Cnt-graphene Compositesmentioning

confidence: 99%

Flexible Supercapacitors – Development of Bendable Carbon Architectures

Niu

Liu

Sherrell

et al. 2013

ACS Symposium Series

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As energy storage devices, Supercapacitors (SCs), also known as electrochemical capacitors, possess high power densities, excellent reversibility and long cycle life. SCs could be applied to diverse fields including electric vehicles, pulse power applications and portable devices. Flexible SCs have attracted significant attention for powering recently developed portable, flexible and wearable electronics. During the past several years, a variety of bendable carbon-based electrode architechtures and flexible SC devices with different designs have been successfully prepared. In this review, we will describe recent developments in the preparation of such bendable carbon-based electrode architechtures and the subsequent design of flexible SC devices. Future development and prospects of flexible SCs are also discussed.

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A flexible graphene/multiwalled carbon nanotube film as a high performance electrode material for supercapacitors

Cited by 250 publications

References 60 publications

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

Carbon Nanomaterials for Flexible Energy Storage

Flexible Supercapacitors – Development of Bendable Carbon Architectures

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