Chemically Integrated Inorganic‐Graphene Two‐Dimensional Hybrid Materials for Flexible Energy Storage Devices

Peng, Lele; Zhu, Yue; Li, Hongsen; Yu, Guihua

doi:10.1002/smll.201602109

Cited by 134 publications

(57 citation statements)

References 135 publications

(120 reference statements)

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“…With the rapid development of new-generation flexible electronics, [1,2] such as wearable and portable electronic devices, roll-up displays, implantable biomedical products, conformable health-monitoring sensors, etc., future power sources are required to be mechanically flexible and also have both high energy and large power as well as long cycle life. [3][4][5] As the current main energy As for the cathode, the most widely used cathode material in NICs is commercial activated carbon (AC).…”

Section: Introductionmentioning

confidence: 99%

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Chao

Wang

et al. 2018

Advanced Energy Materials

206

123

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storage device, lithium ion batteries can provide high energy but usually suffer from a low power rate and short life span. To overcome these drawbacks, researchers propose the so-called metal-ion capacitors, or hybrid batteries, which combine a battery anode and a capacitor electrode in order to achieve tradeoff between conventional battery and supercapacitor. [6][7][8] It is expected that such hybrid system delivers a capacitor-like fast charge/ discharge rate and battery-like high capacity. Since the first introduction in 2001, great progress has been achieved in the field of hybrid lithium-ion capacitors (LICs) through better understanding of the charge storage mechanism and the development of highperformance nanostructured materials. In a LIC, the capacitive cathode is typically a carbonaceous material that enables fast charge− discharge processes, while the reported battery-type anode includes Li 4 Ti 5 O 12 , [9,10] graphite, [11] TiO 2 , [12] MnO, [13] and LiVO 3 . [14] Sodium-ion batteries are becoming one of most promising battery technologies for the foreseeable grid-scale applications, because of more earth-abundant sodium source and their similar chemistry to that of the existing lithium-ion batteries. [15][16][17][18][19][20][21][22] Despite the potential low-cost, constructing hybrid sodium ion capacitors (NICs) faces more challenge because most Na host materials have a rather sluggish kinetic due to the large Na ion sizes. Research on NICs began in early 2012, [23] and was focused on improving the power capability of the anode in order to match the fast kinetics of the capacitive cathode. Strategies to increase sodium ion (Na + ) and electron (e − ) transport kinetics of NIC electrodes reported so far include: (1) developing new electrode materials (such as 2D MXene Ti 2 C, [24] V 2 C), [25] (2) constructing more conductive electrode structures by hybridizing with carbon (such as NaTi 2 (PO 4 ) 3 /rGO, [26] C@NVP, [27] Nb 2 O 5 @C/rGO, [28] TiO 2 mesocages@rGO, [29] and (3) shortening the ion diffusion and electron transport lengths by rational designing nanostructures (such as TiO 2 nanospheres, [30] Ti(O,N) nanowires, [31] Na 2 Ti 3 O 7 nanosheets [32] ). Despite these efforts, these reported anodes of NIC still have relatively limited rate performance and especially low Na-ion storage capacity. Among other reasons, most of these electrode materials are powder samples, which require substantial amount of conductive additives (such as super P, 10-20 wt%) and binder in order to make compact films. This not only weakens the electron transport but also unable to meet the flexibility requirement.Achieving high-performance Na-ion capacitors (NICs) has the particular challenge of matching both capacity and kinetics between the anode and cathode. Here a high-power NIC full device constructed from 2D metal-organic framework (MOFs) array is reported as the reactive template. The MOF array is converted to N-doped mesoporous carbon nanosheets (mp-CNSs), which are then uniformly encapsulated with VO 2 and Na...

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Section: Introductionmentioning

confidence: 99%

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Chao

Wang

et al. 2018

Advanced Energy Materials

206

123

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“…Furthermore, with advances in flexible and wearable electronic devices, the demand for flexible energy generation has rapidly increased. [18][19][20] Thermoelectrics has the potential to harvest energy from the natural temperature difference between the human body and the environment, and then charge the wearable electronic devices. To address this increasing need, high performance flexible thermoelectrics base on organic conductive polymers have been studied [21][22][23] thanks to their intrinsically high electrical conductivity, low thermal conductivity, and high mechanical flexibility to cover hot source with arbitrary geometry.…”

mentioning

confidence: 99%

Mechanically Durable and Flexible Thermoelectric Films from PEDOT:PSS/PVA/Bi_0.5Sb_1.5Te₃ Nanocomposites

Zhang

et al. 2017

Adv Elect Materials

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approaches to significantly enhance ZT values. One is using low-dimensional TE materials [4] such as nanowire, [5,6] nanotube, [7] nanocrystal, [8] and superlattice film [9] owing to quantum size effects, and the other is based on new phonon glasselectron crystal TE materials [10] such as skutterudites, [11] clathrates, [12] and some composites [13] due to specific components and unique structures.A large amount of previous work has been devoted to the inorganic TE materials, and Bi 2 Te 3 -based alloys have already been used in commercial products because of their high TE performance at room temperature. [14][15][16][17] The reported ZT values of p-type Bi x Sb 2−x Te 3 nanocomposite [14] and Bi 2 Te 3 /Sb 2 Te 3 superlattice [9] are as high as 1.35 and 2.4 at room temperature, respectively. Still, several drawbacks of inorganic thermoelectrics limit their broad applications inclusive of expensive raw materials, heavy metal pollution, high processing cost, difficult fabrication on large-area, rigid, and heavy TE devices. Furthermore, with advances in flexible and wearable electronic devices, the demand for flexible energy generation has rapidly increased. [18][19][20] Thermoelectrics has the potential to harvest energy from the natural temperature difference between the human body and the environment, and then charge the wearable electronic devices. To address this increasing need, high performance flexible thermoelectrics base on organic conductive polymers have been studied [21][22][23] thanks to their intrinsically high electrical conductivity, low thermal conductivity, and high mechanical flexibility to cover hot source with arbitrary geometry. Recently, major breakthroughs have focused on the TE properties of the conducting polymers such as polyaniline, [24] polythiophene, [25] and especially for poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). [26][27][28][29] PEDOT:PSS is a conductive polymer for optoelectronics applications with high optical transparency and electrical conductivity up to 3400 S cm −1 by secondarily doping organic solvents such as dimethyl sulfoxide (DMSO), ethylene glycol (EG), and N-methyl-2-pyrrolidinone (NMP). [30] More specifically, a maximum ZT value of 0.28 was obtained for EG-mixed PEDOT:PSS thin film and a maximum value of 0.42 for DMSO-mixed PEDOT:PSS thin film at room temperature by tuning the doping/dedoping level. [28] Another effective way to enhance the TE performance of conducting polymers is to introduce inorganic nanomaterials with high TE property into conducting polymer matrix Advances in organic thermoelectric materials have focused on the enhancement of mechanical property to address the limitations and needs of forming flexible and free-standing films for the application of flexible/wearable thermoelectric devices. Herein, thermoelectric nanocomposite films are fabricated based on conductive polymer poly(3,4-ethylenedioxythiophene):poly-(styrenesulfonate) (PEDOT:PSS), plastic reinforcer polyvinyl alcohol (PVA), and inorganic Bi 0.5 Sb 1.5 Te 3 th...

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“…The first strategy is to intercalate some “spacers,” such as carbon nanotubes (CNTs), nanodiamond (ND), polymers, and metal oxides, between graphene sheets to form composite films. The resulting graphene‐based composite films can still maintain the excellent mechanical properties associated with the graphene film while having a much higher accessible surface area and efficient pathways for the transport of electrolyte ions.…”

Section: Film‐shaped Flexible Supercapacitorsmentioning

confidence: 99%

Graphene‐Based Nanomaterials for Flexible and Wearable Supercapacitors

Huang

Santiago

Loyselle

et al. 2018

Small

119

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Along with the quick development of flexible and wearable electronic devices, there is an ever-growing demand for light-weight, flexible, and wearable power sources. Because of the high power density, excellent cycling stability and easy fabrication, flexible supercapacitors are widely studied for this purpose. Graphene-based nanomaterials are attractive electrode materials for flexible and wearable supercapacitors owing to their high surface area, good mechanical and electrical properties, and excellent electrochemical stability. The 2D structure and high aspect ratio of graphene nanosheets make them easy to assemble into films or fibers with good mechanical properties. In recent years, enormous progress has been made in developing flexible and wearable graphene-based supercapacitors. Here, the material and structure design strategies for developing film-shaped and emerging fiber-shaped flexible supercapacitors based on graphene nanomaterials are summarized.

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Chemically Integrated Inorganic‐Graphene Two‐Dimensional Hybrid Materials for Flexible Energy Storage Devices

Cited by 134 publications

References 135 publications

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Mechanically Durable and Flexible Thermoelectric Films from PEDOT:PSS/PVA/Bi_0.5Sb_1.5Te₃ Nanocomposites

Graphene‐Based Nanomaterials for Flexible and Wearable Supercapacitors

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Chemically Integrated Inorganic‐Graphene Two‐Dimensional Hybrid Materials for Flexible Energy Storage Devices

Cited by 134 publications

References 135 publications

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Mechanically Durable and Flexible Thermoelectric Films from PEDOT:PSS/PVA/Bi0.5Sb1.5Te3 Nanocomposites

Graphene‐Based Nanomaterials for Flexible and Wearable Supercapacitors

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Mechanically Durable and Flexible Thermoelectric Films from PEDOT:PSS/PVA/Bi_0.5Sb_1.5Te₃ Nanocomposites