Smart supercapacitors from materials to devices

Wang, Rui; Yao, Minjie; Niu, Zhiqiang

doi:10.1002/inf2.12037

Cited by 158 publications

(75 citation statements)

References 91 publications

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“…Significantly, owing to their distinct advantages including the simple and safe configuration, quick charge/discharge response, large power output, and long operating life (>100 000 cycles), SCs show a promising prospect in next‐generation energy technologies, like smart and wearable electronics, quick charging cellphones, regenerative braking electric motors, and instant management of industrial power and energy. [ 20–24 ]…”

Section: Introductionmentioning

confidence: 99%

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

et al. 2020

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and considered as indispensable energy storage devices because of their higher power density and greater life expectancy compared with their competitive counterparts such as batteries, fuel cells, and conventional capacitors. Significantly, owing to their distinct advantages including the simple and safe configuration, quick charge/discharge response, large power output, and long operating life (>100 000 cycles), SCs show a promising prospect in next-generation energy technologies, like smart and wearable electronics, quick charging cellphones, regenerative braking electric motors, and instant management of industrial power and energy. [20][21][22][23][24] Currently, there are three main categories of active materials employed to advance the electrochemical performance of SCs: i) carbonaceous matrix, ii) conducting polymers, and iii) metal oxides (MOs). With respect to the former two types, MOs, especially transition MOs, usually delivers a much higher specific capacitance, as their unique crystal structure, combined with the multiple oxidation states of metal ions, are both in favor of excellent charge storage capability. Sometimes, SCs assembled with MOs are also called pseudocapacitors (PCs), because different from carbon-based electrical double layer capacitors (EDLCs), they realize the charge storage via fast Faradaic redox and/or metal ion intercalation reactions. In this way, they could deliver substantially superior specific capacitances as high as 300-1200 F g −1 and offer 10-100 times larger energy density than that of EDLCs. [25][26][27][28][29] In recent years, various MO materials have been proposed as high-performance SCs electrodes, some of which the theoretical capacitances and common operating potential windows are summarized in Figure 1a,b. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Nevertheless, further practical applications of these SCs are severely hindered by the poor electrical conductivity and frustrating structural stability of semiconductive MOs. To address these issues, owing to the rapid advancement of nanotechnology, a series of nano-and meso-scale morphological engineering strategies have been proposed to boost the electrochemical performance of MOs, either by enlarging the electrochemical active surface area or by shortening the diffusion length of electrons/ions. [30][31][32] For instance, combining MOs with some other highly conductive substances such as carbonaceous materials and metals is validated to be a feasible Metal oxides (MOs) with multiple active sites are regarded as one of the most potential active materials for high-performance supercapacitor (SC) constructions. Engineering oxygen vacancies into MOs can effectively modulate their electronic properties, subtly induce impurity states in their bandgaps, and considerably optimize their electrical conductivity. Benefiting from these advantageous properties, the resultant oxygen-defective electrodes generally embed more electrochemical active sites and present better charge storage capability in co...

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Section: Introductionmentioning

confidence: 99%

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

et al. 2020

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“…44 The working phenomenon of the supercapacitor is different capacitive pressure sensor from many prospective. 45 The capacitance in supercapacitors comes from the reversible charge accumulation upon the surface of electrode. Upon applying the potential difference, the cations and anions in the electrolyte move toward the surface of electrode materials (oppositely charged), hence a layer is formed near to separator.…”

Section: Introductionmentioning

confidence: 99%

Inner egg shell membrane based bio-compatible capacitive and piezoelectric function dominant self-powered pressure sensor array for smart electronic applications

2020

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“…14) verify their typical pseudocapacitance mainly, which typically results from fast and reversible redox processes of Co 2+ /Co 3+ /Co 4+ and Ni 2+ /Ni 3+ in 2 M KOH aqueous solution. 9,14,15,42,43 As derived from the chronopotentiometry (CP) plots (Fig. 6b), the spinel NiCo 2 O 4 electrode with a mass loading 5 mg cm À2 exhibits reversible SCs of $262, $260, $258, $256, $222 and $133 F g À1 at the current densities of 2, 3, 4, 5, 10 and 20 A g À1 , respectively.…”

Section: Electrochemical Propertiesmentioning

confidence: 96%

“…As a result, enormous amounts of research have been greatly stimulated to develop high-performance electrode materials with pseudocapacitive characteristics. 4,5 Binary transition metal oxides (BTMOs) have been intensively investigated as active materials for supercapacitors due to their easy availability, environmental friendliness, and multiple oxidation states for efficient charge storage. 6,7 Especially, spinel NiCo 2 O 4 and rock-salt NiCoO 2 , stand out from others, owing to their more than two orders of magnitude higher electrical conductivity than their parent cobalt oxides.…”

Section: Introductionmentioning

confidence: 99%

Understanding the crystal structure-dependent electrochemical capacitance of spinel and rock-salt Ni–Co oxides via density function theory calculations

Sun

Guo

et al. 2020

RSC Adv.

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Smart supercapacitors from materials to devices

Cited by 158 publications

References 91 publications

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

Inner egg shell membrane based bio-compatible capacitive and piezoelectric function dominant self-powered pressure sensor array for smart electronic applications

Understanding the crystal structure-dependent electrochemical capacitance of spinel and rock-salt Ni–Co oxides via density function theory calculations

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