The way to improve the energy density of supercapacitors: Progress and perspective

Wu, Yu; Cao, Chen

doi:10.1007/s40843-018-9290-y

Cited by 131 publications

(63 citation statements)

References 72 publications

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“…This offers a path forward to designing better supercapacitors through defect engineering. Such approaches could also help address one of the biggest drawbacks of supercapacitors, which is their lower energy density compared to batteries . Another drawback of 2D materials is restacking of layers after exfoliation, lowering the number of sites available for charge accumulation; future studies can improve on device architectures to enable efficient charge insertion and extraction.…”

Section: Power and Energymentioning

confidence: 99%

Emerging Applications of Elemental 2D Materials

et al. 2019

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As elemental main group materials (i.e., silicon and germanium) have dominated the field of modern electronics, their monolayer 2D analogues have shown great promise for next‐generation electronic materials as well as potential game‐changing properties for optoelectronics, energy, and beyond. These atomically thin materials composed of single atomic variants of group III through group VI elements on the periodic table have already demonstrated exciting properties such as near‐room‐temperature topological insulation in bismuthene, extremely high electron mobilities in phosphorene and silicone, and substantial Li‐ion storage capability in borophene. Isolation of these materials within the postgraphene era began with silicene in 2010 and quickly progressed to the experimental identification or theoretical prediction of 15 of the 18 main group elements existing as solids at standard pressure and temperatures. This review first focuses on the significance of defects/functionalization, discussion of different allotropes, and overarching structure–property relationships of 2D main group elemental materials. Then, a complete review of emerging applications in electronics, sensing, spintronics, plasmonics, photodetectors, ultrafast lasers, batteries, supercapacitors, and thermoelectrics is presented by application type, including detailed descriptions of how the material properties may be tailored toward each specific application.

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Section: Power and Energymentioning

confidence: 99%

Emerging Applications of Elemental 2D Materials

et al. 2019

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“…However, their energy density still needs further improvements to enlarge the applied fields. One of the most widespread methods to heighten the energy density of supercapacitors is developing new electrode materials . The developing electrode materials for supercapacitors can be classified to carbon materials, metal oxides/sulphides, and conductive polymers .…”

Section: Introductionmentioning

confidence: 99%

Potassium sulphate (K₂SO₄) activation of chestnut shell to oxygen‐enriched porous carbons with enhanced capacitive properties

Peng

Zhang

et al. 2020

Int J Energy Res

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Noncorrosive K 2 SO 4 is found to be able to activate the chestnut shell carbon to oxygen-enriched porous carbons. Chestnut shells are activated by K 2 SO 4 . The structure, texture, chemical state of surface of samples and morphology are analyzed via X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectra, transmission electron microscopy and scanning electron microscopy, respectively. With the optimum amount of K 2 SO 4 (m(K 2 SO 4 )/m(C) = 1.8), higher specific surface area (SSA, 1412 m 2 g −1 ) and total pore volume (0.75 m 2 g −1 ) are obtained. The prepared carbon samples exhibit a hierarchical textural structure making up of micropores, mesopores and macropores. More importantly, a large amount of oxygen defects, as high as 37.7%, and a small amount of sulfur element (0.31%-0.79%) are successfully introduced on the surface of the carbons. The activation mechanism of K 2 SO 4 is also investigated via thermogravimetry analysis (TGA) and differential scanning calorimetry (DSC), which put it down to the high-temperature redox reaction between C and K 2 SO 4 . Owing to the high SSA, the composition of pore, and the abundant surface defects, the activated porous carbons originated from chestnut shell carbon possess highly enhanced capacitive properties. At 0.1 A/g, the specific capacitance reaches 265 F/g, and retains 92% of its starting value after 10 000 cycles at 10 A/g. In general, K 2 SO 4 is a promising noncorrosive alternative to the conventional KOH activator. K E Y W O R D Sactivator, chestnut shell, K 2 SO 4 , oxygen defect, porous carbon, supercapacitor

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“…Despite the fact that UC's cost is high, in long term, UCs might be less expensive or similar. UCs have low energy density compared with batteries that can be enhanced by improving the capacitance and working voltage …”

Section: Introductionmentioning

confidence: 99%

“…UCs have low energy density compared with batteries that can be enhanced by improving the capacitance and working voltage. 11 Power electronic converters or rectifiers are used to connect the generating units to a common direct current (DC) bus. The DC bus voltage has to be maintained constant as far as the stability is concerned.…”

Section: Introductionmentioning

confidence: 99%

Energy storage management of hybrid solar/wind standalone system using adaptive neuro‐fuzzy inference system

Varghese

Reji

2019

Int Trans Electr Energ Syst

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Summary This paper proposes a charge controller for ultracapacitor that acts as an energy storage device so that it can minimize the effect of irregular solar radiation and widely varying wind velocity. A suitable supervision for each generating unit and ultracapacitor are mandatory for a standalone system. The primary energy sources solar and wind systems are operating at maximum power point. Adaptive neuro‐fuzzy inference system (ANFIS) is utilized to foresee the voltage of panel at which extreme power is obtained for a solar system and also to ascertain the most extreme power delivered by the nonuniform and unpredictable characteristics of solar and wind energy sources. A common energy management technique is developed to manage the control flow between the distinctive power sources, loads, and ultracapacitor in the system. The results obtained by ANFIS are compared with artificial neural network. A Simulink model of the hybrid standalone system was developed and tested for various insolation, temperature, and wind velocity.

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The way to improve the energy density of supercapacitors: Progress and perspective

Cited by 131 publications

References 72 publications

Emerging Applications of Elemental 2D Materials

Emerging Applications of Elemental 2D Materials

Potassium sulphate (K₂SO₄) activation of chestnut shell to oxygen‐enriched porous carbons with enhanced capacitive properties

Energy storage management of hybrid solar/wind standalone system using adaptive neuro‐fuzzy inference system

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The way to improve the energy density of supercapacitors: Progress and perspective

Cited by 131 publications

References 72 publications

Emerging Applications of Elemental 2D Materials

Emerging Applications of Elemental 2D Materials

Potassium sulphate (K2SO4) activation of chestnut shell to oxygen‐enriched porous carbons with enhanced capacitive properties

Energy storage management of hybrid solar/wind standalone system using adaptive neuro‐fuzzy inference system

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Potassium sulphate (K₂SO₄) activation of chestnut shell to oxygen‐enriched porous carbons with enhanced capacitive properties