Pseudocapacitance: From Fundamental Understanding to High Power Energy Storage Materials

Fleischmann, Simon; Mitchell, James B.; Wang, Ruocun; Zhan, Cheng; Jiang, De‐en; Presser, Volker; Augustyn, Veronica

doi:10.1021/acs.chemrev.0c00170

Cited by 1,317 publications

(1,008 citation statements)

References 289 publications

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“…The growing demand for modern flexible portable electronics increases the need for lightweight, low-cost, high-performance compact power sources [ 1 , 2 , 3 ]. In terms of decentralized energy storage, peak power management, back-up energy storage, the electrochemical energy storage devices, including Li-ion batteries and supercapacitors (SCs) are recognized currently as the most promising devices [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient Flexible All-Solid Supercapacitors with Direct Sputter-Grown Needle-Like Mn/MnOx@Graphite-Foil Electrodes and PPC-Embedded Ionic Electrolytes

2020

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Recent critical issues regarding next-generation energy storage systems concern the cost-effective production of lightweight, safe and flexible supercapacitors yielding high performances, such as high energy and power densities as well as a long cycle life. Thus, current research efforts are concentrated on the development of high-performance advance electrode materials with high capacitance and excellent stability and solid electrolytes that confer flexibility and safety features. In this work, emphasis is placed on the binder-free, needle-like nanostructured Mn/MnOx layers grown onto graphite-foil deposited by reactive sputtering technique and to the polymer gel embedded ionic electrolytes, which are to be employed as new flexible pseudocapacitive supercapacitor components. Microstructural, morphological and compositional analysis of the layers has been investigated by X-ray diffractometer (XRD), Field Emission Scanning Electron Microscope (FE–SEM) and X-ray photoelectron spectroscopy (XPS). A flexible lightweight symmetric pouch-cell solid-state supercapacitor device is fabricated by sandwiching a PPC-embedded ionic liquid ethyl-methylimidazolium bis (trifluoromethylsulfonyl) imide (EMIM)(TFSI) polymer gel electrolyte (PGE) between two Mn/MnOx@Graphite-foil electrodes and tested to exhibit promising supercapacitive behaviour with a wide stable electrochemical potential window (up to 2.2 V) and long-cycle stability. This pouch-cell supercapacitor device offers a maximum areal capacitance of 11.71 mF/cm2@ 0.03 mA/cm2 with maximum areal energy density (Ea) of 7.87 mWh/cm2 and areal power density (Pa) of 1099.64 mW/cm2, as well as low resistance, flexibility and good cycling stability. This supercapacitor device is also environmentally safe and could be operated under a relatively wide potential window without significant degradation of capacitance performance compared to other reported values. Overall, these rationally designed flexible symmetric all-solid-state supercapacitors signify a new promising and emerging candidate for component integrated storage of renewable energy harvested current.

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Section: Introductionmentioning

confidence: 99%

Efficient Flexible All-Solid Supercapacitors with Direct Sputter-Grown Needle-Like Mn/MnOx@Graphite-Foil Electrodes and PPC-Embedded Ionic Electrolytes

2020

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“…Therefore, as it has been reported in different studies [476,487] that carbonaceous materials could be used as a backbone, in the composite material along with redox-active materials such as MOs and CPs, or could be integrated with novel 2D materials such as MXene [489,490] to fabricate the appropriate flexible film as the electrode material for flexible/transparent SCs. Furthermore, incorporating the redox-active small molecules and bioderived functional groups into the pseudocapacitive material, as well as their utilization to increase the capacitance of the carbon-based material, have been provided more efficient, lower cost, non-toxic electrodes for SC application through eco-friendly synthesis [491,492].…”

Section: Applications and Future Perspectivesmentioning

confidence: 99%

Electrode Materials for Supercapacitors: A Review of Recent Advances

2020

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The advanced electrochemical properties, such as high energy density, fast charge–discharge rates, excellent cyclic stability, and specific capacitance, make supercapacitor a fascinating electronic device. During recent decades, a significant amount of research has been dedicated to enhancing the electrochemical performance of the supercapacitors through the development of novel electrode materials. In addition to highlighting the charge storage mechanism of the three main categories of supercapacitors, including the electric double-layer capacitors (EDLCs), pseudocapacitors, and the hybrid supercapacitors, this review describes the insights of the recent electrode materials (including, carbon-based materials, metal oxide/hydroxide-based materials, and conducting polymer-based materials, 2D materials). The nanocomposites offer larger SSA, shorter ion/electron diffusion paths, thus improving the specific capacitance of supercapacitors (SCs). Besides, the incorporation of the redox-active small molecules and bio-derived functional groups displayed a significant effect on the electrochemical properties of electrode materials. These advanced properties provide a vast range of potential for the electrode materials to be utilized in different applications such as in wearable/portable/electronic devices such as all-solid-state supercapacitors, transparent/flexible supercapacitors, and asymmetric hybrid supercapacitors.

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“…According to the principle of energy storage, supercapacitors can 2 of 25 be divided into two types: electric double-layer capacitors [14] and pseudocapacitors [15]. For the electric double-layer capacitor, the process of energy storage is completed by the rapid adsorption and desorption of electrolyte ions on the surface of the electrode material, which is a pure physical adsorption process, affecting the efficiency of energy storage [16]. For the pseudocapacitor, the process of energy storage is completed by the rapidly reversible oxidation-reduction reactions on the surface or near the surface of the material, so there is a certain consumption of the electrode material, resulting in poor cycle stability [17].…”

Section: Introductionmentioning

confidence: 99%

Research Progress of Graphene-Based Materials on Flexible Supercapacitors

Xiao

Yuan

et al. 2020

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With the development of wearable and flexible electronic devices, there is an increasing demand for new types of flexible energy storage power supplies. The flexible supercapacitor has the advantages of fast charging and discharging, high power density, long cycle life, good flexibility, and bendability. Therefore, it exhibits great potential for use in flexible electronics. In flexible supercapacitors, graphene materials are often used as electrode materials due to the advantages of their high specific surface area, high conductivity, good mechanical properties, etc. In this review, the classification of flexible electrodes and some common flexible substrates are firstly summarized. Secondly, we introduced the advantages and disadvantages of five graphene-based materials used in flexible supercapacitors, including graphene quantum dots (GQDs), graphene fibers (GFbs), graphene films (GFs), graphene hydrogels (GHs), and graphene aerogels (GAs). Then, we summarized the latest developments in the application of five graphene-based materials for flexible electrodes. Finally, the defects and outlooks of GQDs, GFbs, GFs, GHs, and GAs used in flexible electrodes are given.

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Pseudocapacitance: From Fundamental Understanding to High Power Energy Storage Materials

Cited by 1,317 publications

References 289 publications

Efficient Flexible All-Solid Supercapacitors with Direct Sputter-Grown Needle-Like Mn/MnOx@Graphite-Foil Electrodes and PPC-Embedded Ionic Electrolytes

Efficient Flexible All-Solid Supercapacitors with Direct Sputter-Grown Needle-Like Mn/MnOx@Graphite-Foil Electrodes and PPC-Embedded Ionic Electrolytes

Electrode Materials for Supercapacitors: A Review of Recent Advances

Research Progress of Graphene-Based Materials on Flexible Supercapacitors

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