Capacitive energy storage in micro-scale devices: recent advances in design and fabrication of micro-supercapacitors

Beidaghi, Majid; Gogotsi, Yury

doi:10.1039/c3ee43526a

Cited by 1,142 publications

(867 citation statements)

References 109 publications

(165 reference statements)

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“…Whereas great efforts have been made for the fabrication of macroscale hybrid supercapacitors, there are only a few studies on the design and integration of hybrid materials into microsupercapacitors (26). This is likely due to complicated microfabrication techniques that often involve building 3D microelectrodes with micrometer separations.…”

Section: Significancementioning

confidence: 99%

Engineering three-dimensional hybrid supercapacitors and microsupercapacitors for high-performance integrated energy storage

El‐Kady

Ihns

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

506

321

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Supercapacitors now play an important role in the progress of hybrid and electric vehicles, consumer electronics, and military and space applications. There is a growing demand in developing hybrid supercapacitor systems to overcome the energy density limitations of the current generation of carbon-based supercapacitors. Here, we demonstrate 3D high-performance hybrid supercapacitors and microsupercapacitors based on graphene and MnO 2 by rationally designing the electrode microstructure and combining active materials with electrolytes that operate at high voltages. This results in hybrid electrodes with ultrahigh volumetric capacitance of over 1,100 F/cm 3 . This corresponds to a specific capacitance of the constituent MnO 2 of 1,145 F/g, which is close to the theoretical value of 1,380 F/g. The energy density of the full device varies between 22 and 42 Wh/l depending on the device configuration, which is superior to those of commercially available double-layer supercapacitors, pseudocapacitors, lithium-ion capacitors, and hybrid supercapacitors tested under the same conditions and is comparable to that of lead acid batteries. These hybrid supercapacitors use aqueous electrolytes and are assembled in air without the need for expensive "dry rooms" required for building today's supercapacitors. Furthermore, we demonstrate a simple technique for the fabrication of supercapacitor arrays for high-voltage applications. These arrays can be integrated with solar cells for efficient energy harvesting and storage systems.A s a result of the rapidly growing energy needs of modern life, the development of high-performance energy storage devices has gained significant attention. Supercapacitors are promising energy storage devices with properties intermediate between those of batteries and traditional capacitors, but they are being improved more rapidly than either (1). Over the past couple of decades, supercapacitors have become key components of everyday products by replacing batteries and capacitors in an increasing number of applications. Their high power density and excellent low-temperature performance have made them the technology of choice for backup power, cold starting, flash cameras, regenerative braking, and hybrid electric vehicles (2, 3). The future growth of this technology depends on further improvements in energy density, power density, calendar and cycle life, and production cost.According to their charge storage mechanism, supercapacitors are classified as either electric double-layer capacitors (EDLCs) or pseudocapacitors (2). In EDLCs, charge is stored through rapid adsorption-desorption of electrolyte ions on high-surfacearea carbon materials, whereas pseudocapacitors store charge via fast and reversible Faradaic reactions near the surface of metal oxides or conducting polymers. The majority of supercapacitors currently available in the market are symmetric EDLCs featuring activated carbon electrodes and organic electrolytes that provide cell voltages as high as 2.7 V. Although these EDLCs exhibit high...

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Section: Significancementioning

confidence: 99%

Engineering three-dimensional hybrid supercapacitors and microsupercapacitors for high-performance integrated energy storage

El‐Kady

Ihns

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

506

321

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“…A large variety of materials such as graphene (3)(4)(5), nanotubes (6, 7), carbide-derived carbons (CDC) (8,9), and pseudocapacitive materials (1,10,11) have been explored in micro-supercapacitors in the past 5 years. Much of the recent work focused on the use of wet processing routes (using colloidal solutions or suspensions of particles for the electrode preparation) for the development of flexible micro-devices for printable electronics (1,4,5,12). However, the wet processing methods are not fully compatible with semiconductor device manufacturing used in the electronics industry, thus hampering supercapacitor manufacturing on silicon chips.…”

mentioning

confidence: 99%

“…Radio frequency identification (RFID) tags for the development of smart environments are another critical application that requires compact energy storage. Accordingly, designing efficient miniaturized energy storage devices for energy delivery or harvesting with high-power capabilities remains a challenge (1).…”

mentioning

confidence: 99%

On-chip and freestanding elastic carbon films for micro-supercapacitors

Huang

Lethien

Pinaud

et al. 2016

Science

635

423

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“…The device is usually obtained using standard micro-fabrication techniques where the distance between the two microelectrodes can be controlled to tens of micrometers, decreasing the ion transport distance and increasing the accessible area of the electrodes. This design has enabled the fabrication of micro-supercapacitors with excellent rate capabilities [73]. Great efforts have been made to synthesize electrode films with high specific capacitance per unit area at the same time using cost-effective fabrication methods.…”

Section: Micro-supercapacitorsmentioning

confidence: 99%

Highly densified carbon electrode materials towards practical supercapacitor devices

Zhu

2016

Sci. China Mater.

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Supercapacitors are expected to bridge the gap between conventional electrostatic capacitors and batteries, but have not found significant application in primary energy devices, partly due to some unsolved problems in the electrode materials. A wide range of novel materials such as novel carbons have been investigated to increase the energy density of the electrodes and the volumetric merits of the materials need to be specifically considered and evaluated, towards the practical application of these novel materials. In observation of the intense research activity to improve the volumetric performance of carbon electrodes, the density or mass loading is particularly important and shall be further optimized, both for commercially applied activated carbons and in novel carbon electrode materials such as graphene. In this review, we presented a brief overview of the recent progress in improving the volumetric performance of carbon-based supercapacitor electrodes, particularly highlighting the development of densified electrodes by various technical strategies including the controlled assembly of carbon building blocks, developing carbon based hybrid composites and constructing micro-supercapacitors.

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Capacitive energy storage in micro-scale devices: recent advances in design and fabrication of micro-supercapacitors

Cited by 1,142 publications

References 109 publications

Engineering three-dimensional hybrid supercapacitors and microsupercapacitors for high-performance integrated energy storage

Engineering three-dimensional hybrid supercapacitors and microsupercapacitors for high-performance integrated energy storage

On-chip and freestanding elastic carbon films for micro-supercapacitors

Highly densified carbon electrode materials towards practical supercapacitor devices

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