Engineering the Electrochemical Capacitive Properties of Graphene Sheets in Ionic‐Liquid Electrolytes by Correct Selection of Anions

Shi, Minjie; Kou, Shengzhong; Yan, Xingbin

doi:10.1002/cssc.201402275

Cited by 80 publications

(57 citation statements)

References 51 publications

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“…Notably,w ith the increasing current density up to 60 Ag À1 ,t he capacitance of OMCNS electrode remained at 110 Fg À1 ,which is higher or comparable to those reported previously (that is,8 0-100 Fg À1 )a ts imilar current densities. [29][30][31][32][33] On the contrary,t he capacitances of CNS and OMC at 60 Ag À1 fell to 48 and 20 Fg À1 ,respectively,indicating as evere decrease in the power capability of CNS and OMC compared with OMCNS-based cells because of the limitation of ion transfer in the inner porous network.…”

Section: Angewandte Chemiementioning

confidence: 95%

Confined Self‐Assembly in Two‐Dimensional Interlayer Space: Monolayered Mesoporous Carbon Nanosheets with In‐Plane Orderly Arranged Mesopores and a Highly Graphitized Framework

et al. 2018

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Although two-dimensional (2D) carbon materials are widely investigated, a well-defined 2D carbon nanosheet with an ordered mesostructure has rarely been realized. Monolayer-ordered mesoporous carbon nanosheets (OMCNS) were prepared through confinement assembly of resol and F127 in the interlayer of montmorillonite (MONT). The nanoscale distance of the interlayer space of MONT only allow the assembly of resol and F127 in the same plane, leading to ordered mesopores perpendicular to carbon nanosheets, and favor the formation of sp carbon, resulting in a high degree of graphitization. The mesopores on the carbon nanosheets provide efficient ion diffusion, and the high degree of graphitization provides a fast electron-transport route, enabling OMCNS as excellent electrode materials for electric double layer capacitors.

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Section: Angewandte Chemiementioning

confidence: 95%

Confined Self‐Assembly in Two‐Dimensional Interlayer Space: Monolayered Mesoporous Carbon Nanosheets with In‐Plane Orderly Arranged Mesopores and a Highly Graphitized Framework

et al. 2018

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“…258 The modification (e.g., introduction of the ether bond) of commonly used IL's cations and anions could also decrease ES's ESR. Developing electrolytes with high ionic conductivities and low viscosity is beneficial for decreasing the ESR values.…”

Section: Summary and Possible Research Directions For Overcoming The mentioning

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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“…Furthermore, after performing up to 5000 charge-discharge processes, only slight decrease of the capacitance and almost identical ESR characteristic are discerned (Figure 6d), demonstrating the excellent stability and favorable resistive behaviors of WSSCs. In this case, the electricity produced by wind power cannot be largely consumed by ohmic losses of WSSCs, [54,55] which ensure the high conversion efficiency of wind power generation during the repeated charging-discharging processes.…”

Section: Wwwadvsustainsyscommentioning

confidence: 99%

Integrated Sustainable Wind Power Harvesting and Ultrahigh Energy Density Wire‐Shaped Supercapacitors Based on Vertically Oriented Nanosheet‐Array‐Coated Carbon Fibers

Shi

Yang

Song

et al. 2017

Advanced Sustainable Systems

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technologies, such as solar cells, which harvest energy from sunlight, and triboelectric generators, which produce electricity from human motion. Unfortunately, these devices cannot ensure an efficient power supply for energy storage devices due to the intermittency of sunlight and the low current output of triboelectric electricity. [5][6][7] Moreover, the practical applications of solar cells and triboelectric generators are still limited by their high cost and sophisticated fabrication processes.Among the various sustainable energy sources, wind power is of significant importance due to its universal availability and relatively good continuity, since it exists day and night. [8] Wind power can be easily harvested and converted into efficient electricity by using a low cost winddriven generator (WDG). [9,10] Compared with triboelectric electricity, the electricity produced by wind power delivers high output current and voltage. [11] Recently, the development of wind power harvesting in close conjunction with energy storage has attracted a great deal of research interest. Previous works have focused on integrating WDG with supercapacitors (SCs), due to the fast charging-discharging capability and long cycle life of SCs. [12][13][14] Nevertheless, the key in this field is how to develop the SCs with low electrical resistance, which can reduce energy loss to ensure high conversion efficiency of wind power generation, while well-maintaining high energy density to sufficiently store the harvested energy. [13][14][15] Accordingly, it is more desirable to build a windcharging power system by integrating sustainable wind power harvesting and high-performance SCs with low resistance and high energy density.To meet the demand for portable and wearable electronics, wire-shaped SCs (WSSCs) hold great promise owing to their low weight, tiny volume, and high flexibility. [16][17][18][19] Zhi and coworkers rationally fabricated flexible SCs [20] and WSSCs with shape memory function [21,22] for smart energy storage textiles, as well as built self-powered systems by integrating smart SCs with a photodetector and sensor. [23,24] As we know, carbon fiber Wind power harvesting in conjunction with supercapacitors (SCs) has attracted considerable attention. Nevertheless, the bottleneck in this field is how to develop SCs with low electrical resistance and high energy density.Herein, an ingenious strategy to integrate wind power harvesting and asymmetric wire-shaped SCs (WSSCs) has been put forward for the first time. Remarkably, the asymmetric WSSCs are realized by using vertical FeOOH and CoNi 2 S 4 nanosheet-array-coated flexible carbon fibers as negative and positive yarn electrodes, in which a vertically oriented and cross-linked porous network, formed by electroactive nanosheet arrays, facilitates ionic diffusion and charge transport. Benefiting from an intriguing configuration, these asymmetric WSSCs, with superior flexibility and weavability, act as efficient energy storage devices, which exhibit low resistance, high volumetr...

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Engineering the Electrochemical Capacitive Properties of Graphene Sheets in Ionic‐Liquid Electrolytes by Correct Selection of Anions

Cited by 80 publications

References 51 publications

Confined Self‐Assembly in Two‐Dimensional Interlayer Space: Monolayered Mesoporous Carbon Nanosheets with In‐Plane Orderly Arranged Mesopores and a Highly Graphitized Framework

Confined Self‐Assembly in Two‐Dimensional Interlayer Space: Monolayered Mesoporous Carbon Nanosheets with In‐Plane Orderly Arranged Mesopores and a Highly Graphitized Framework

A review of electrolyte materials and compositions for electrochemical supercapacitors

Integrated Sustainable Wind Power Harvesting and Ultrahigh Energy Density Wire‐Shaped Supercapacitors Based on Vertically Oriented Nanosheet‐Array‐Coated Carbon Fibers

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