Anomalous Capacitive Behaviors of Graphene Oxide Based Solid-State Supercapacitors

Zhang, Qing; Scrafford, Kathryn; Li, Mingtao; Cao, Zeyuan; Xia, Zhenhai; Ajayan, Pulickel M.; Wei, Bingqing

doi:10.1021/nl4047784

Cited by 85 publications

(72 citation statements)

References 32 publications

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“…Some studies have been devoted to the development of inorganic solid-state electrolytes for ESs, 324,325,419 although they receive much less attention when compared to the polymer-based solid-state electrolytes. 419,420 Interestingly, Zhang et al 419 studied an all-solid-state sandwiched RGO//GO//RGO supercapacitor with a layering structure. However, they are generally mechanically robust and thermally stable.…”

Section: Solid-or Quasi-solid-state Electrolytes For Essmentioning

confidence: 99%

A review of electrolyte materials and compositions for electrochemical supercapacitors

et al. 2015

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Electrolytes have been identified as some of the most influential components in the performance of electrochemical supercapacitors (ESs), which include: electrical double-layer capacitors, pseudocapacitors and hybrid supercapacitors. This paper reviews recent progress in the research and development of ES electrolytes. The electrolytes are classified into several categories, including: aqueous, organic, ionic liquids, solid-state or quasi-solid-state, as well as redox-active electrolytes. Effects of electrolyte properties on ES performance are discussed in detail. The principles and methods of designing and optimizing electrolytes for ES performance and application are highlighted through a comprehensive analysis of the literature. Interaction among the electrolytes, electro-active materials and inactive components (current collectors, binders, and separators) is discussed. The challenges in producing high-performing electrolytes are analyzed. Several possible research directions to overcome these challenges are proposed for future efforts, with the main aim of improving ESs' energy density without sacrificing existing advantages (e.g., a high power density and a long cycle-life) (507 references).

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Section: Solid-or Quasi-solid-state Electrolytes For Essmentioning

confidence: 99%

A review of electrolyte materials and compositions for electrochemical supercapacitors

et al. 2015

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“…Although graphene oxide usually works as the precursor of RGO in the development of graphene‐based MSC, the hydrated GO can be a part of electrolyte or membrane as reported previously …”

Section: Graphene‐based Materials In Planar Interdigitated Microsupercmentioning

confidence: 99%

Graphene‐Based Planar Microsupercapacitors: Recent Advances and Future Challenges

Liang

Mondal

Wang

et al. 2018

Adv Materials Technologies

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The continuous development of integrated electronics such as maintenance‐free biosensors, remote and mobile environmental sensors, wearable personal electronics, nanorobotics etc. and their continued miniaturization has led to an increasing demand for miniaturized energy storage units. Microsupercapacitors with graphene electrodes hold great promise as miniaturized, integrated power sources thanks to their fast charge/discharge rates, superior power performance, and long cycling stability. In addition, planar interdigitated electrodes also have the capability to reduce ion diffusion distances leading to a greatly improved electrochemical performance. Either as standalone power sources or complementing energy harvesting units, it is expected that graphene‐based microsupercapacitors will play a key role as miniaturized power sources in electronic microsystems. This review highlights the recent development, challenges, and perspectives in this area, with an emphasis on the link between material and geometry design of planar graphene‐based electrodes and their electrochemical performance and integrability.

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“…The relative permittivity of the samples can be deduced from the capacitance of the bulk [26] using equation (2):…”

Section: Resultsmentioning

confidence: 99%

“…Large values of relative dielectric permittivity are also suggested from characterizations of composite materials in which a small fraction of GO added to a polymer enhances the effective permittivity of the composite [16][17][18][19][20][21][22]. By contrast, other studies have reported more moderate values of permittivity, of about 3, or less, in frequency ranges typically from 100 to 1000 Hz [23][24][25][26]. Uses of GO as dielectrics in transistors led also to the conclusion that GO has a relative permittivity typically between 3 and 5 [27][28][29].…”

Section: Introductionmentioning

confidence: 96%

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Absence of giant dielectric permittivity in graphene oxide materials

et al. 2019

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Graphene oxide (GO) is considered as a promising component for electronics because of its unique anisotropy, easy processing and sometimes claimed giant permittivity. The latter would arise from an enhanced electronic polarizability due to the presence of functional groups at the surface and edge of GO flakes. As a matter of fact, a number of publications have reported a very large permittivity of GO materials. Nevertheless, the reported values for the intrinsic relative permittivity vary significantly from a few units to several millions. Such variability raises a critical question on the actual and intrinsic permittivity of GO, and on difficulties of measurements due to the polarization of the electrodes. We presently report impedance spectroscopy characterizations of GO solutions with different solvents. We find very large capacitance at low frequencies, in agreement with previous reports. However, we also show that these results can be interpreted without considering a giant permittivity of GO. Actually, a simple equivalent circuit model allows us to confirm that GO does not have a giant permittivity. We conclude that GO can be used as an electrolyte for supercapacitors, or as a precursor for electrically conductive graphene-based materials, but not as an efficient additive to raise the permittivity of solvents or composites for electronics and energy storage applications.

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Anomalous Capacitive Behaviors of Graphene Oxide Based Solid-State Supercapacitors

Cited by 85 publications

References 32 publications

A review of electrolyte materials and compositions for electrochemical supercapacitors

A review of electrolyte materials and compositions for electrochemical supercapacitors

Graphene‐Based Planar Microsupercapacitors: Recent Advances and Future Challenges

Absence of giant dielectric permittivity in graphene oxide materials

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