Covalently Tethered Polyoxometalate–Pyrene Hybrids for Noncovalent Sidewall Functionalization of Single‐Walled Carbon Nanotubes as High‐Performance Anode Material

Ma, Dui; Liang, Lijun; Chen, Wei; Liu, Haimei; Song, Yu‐Fei

doi:10.1002/adfm.201301624

Cited by 122 publications

(81 citation statements)

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“…combined TBA 3 PMo 12 O 40 with SWNTs as a cathode material for LIBs, which exhibits a capacity of around 250 mA g −1 in the voltage range 1.5–4.2 V. This result opens the possibilities of POM‐based electrode materials . Our group first studied a nanocomposite of pyrene‐modified POMs and SWNTs, and its application as an LIB anode material showed improved charge‐transfer efficiency . Later, we reported the preparation of Anderson covalently functionalized SWNTs, and electrochemical analyses indicated that the resultant nanocomposite had a high discharge capacity of up to 932 mAh g −1 at a current density of 0.5 mA cm −2 with excellent stability .…”

Section: Introductionmentioning

confidence: 99%

“…[17,19] Our group first studied an anocomposite of pyrene-modified POMs and SWNTs, and its applicationa sa n LIB anode material showed improved charge-transfer efficiency. [20,21] Later,w er eportedt he preparation of Anderson covalently functionalized SWNTs, and electrochemical analyses indicated that the resultant nanocomposite had ah igh discharge capacityo fu pto 932 mAh g À1 at ac urrent density of 0.5 mA cm À2 with excellent stability. [22] Li et al reported the amino-graphene/Al-Andersonn anocomposite as an anode material with an enhanced capacity of approximately 1000 mAh g À1 and al ong cycle life of over 1000 cycles.…”

Section: Introductionmentioning

confidence: 99%

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Dawson‐Type Polyoxomolybdate Anions (P₂Mo₁₈O₆₂⁶⁻) Captured by Ionic Liquid on Graphene Oxide as High‐Capacity Anode Material for Lithium‐Ion Batteries

Diao

Luo

et al. 2017

Chemistry A European J

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The development of advanced anode materials is of significance for the next generation of lithium-ion batteries (LIBs). Herein, imidazolium-based ionic liquids (ILs) are grafted covalently on the surface of graphene oxides (GO) through the carboxyl-amino bond, providing a loading hotbed for the Dawson-type polyoxometalate (POM) of (NH ) P Mo O (denoted as P Mo ). The as-prepared GO-IL-P Mo nanocomposite is characterized by FTIR and Raman spectroscopy, TGA, SEM, TEM, and XPS. The nanocomposite is used as the anode material for LIBs, and shows a high reversible capacity of 903.9 mAh g with a long cycle life over 1000 cycles. Galvanostatic cycling tests, CV measurements, and AC impedance spectra reveal that the POMs in the GO-IL-P Mo nanocomposite give an enhanced specific capacity during the Lithium insertion/extraction process, and the IL provides a favored contact between the electrolyte and the electrode.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dawson‐Type Polyoxomolybdate Anions (P₂Mo₁₈O₆₂⁶⁻) Captured by Ionic Liquid on Graphene Oxide as High‐Capacity Anode Material for Lithium‐Ion Batteries

Diao

Luo

et al. 2017

Chemistry A European J

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“…[14][15][16][17][18][19] POMs are highly soluble owing to their anionic nature; as a result, they need to be integrated into hybrid materials for supercapacitor applications. [14][15][16][17][18][19] POMs are highly soluble owing to their anionic nature; as a result, they need to be integrated into hybrid materials for supercapacitor applications.…”

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confidence: 99%

Polyoxometalate‐coupled Graphene via Polymeric Ionic Liquid Linker for Supercapacitors

Yang

Choi

Jung

et al. 2014

Adv Funct Materials

109

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The integration of electrical double-layer capacitive and pseudocapacitive materials into novel hybrid materials is crucial to realize supercapacitors with high energy and power densities. Here, high levels of energy and power densities are demonstrated in supercapacitors based on a new type of nanohybrid electrode consisting of polyoxometalate (POM)-coupled graphene in which a polymeric ionic liquid (henceforth simply PIL) serves as an interfacial linker. The adoption of PIL in the construction of nanohybrids enables a uniform distribution of discrete POM molecules along with a large surface area of graphene sheets. When testing electrochemical characteristics under a two-electrode system, as-prepared supercapacitors exhibit a high specifi c capacitance (408 F g −1 at 0.5 A g −1 ), rapid rate capability (92% retention at 10 A g −1 ), a long cycling life (98% retention during 2000 cycles), and high energy (56 Wh kg −1 ) and power (52 kW kg −1 ) densities. First-principles calculations and impedance spectroscopy analysis reveal that the PILs enhance the redox reactions of POMs by providing effi cient ion transfer channels and facilitating the charge transfer in the nanohybrids.

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“…Therefore, POMs need to be anchored on an insoluble solid matrix with a high specific surface area to achieve high specific capacitance and stable cycle performance. In this respects, nanocarbons (e.g., carbon nanotubes [17][18][19][20] and graphene [21][22][23]) are good candidates for anchoring POMs. Moreover, their superior electrical conductivity and electrochemical/mechanical stability enable improvement in supercapacitor performance [20,22,23].…”

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High-performance asymmetric supercapacitors based on polyoxometalate-graphene nanohybrids

Yang¹,

Choi²

2016

Carbon letters

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Supercapacitors (SCs) have attracted much attention as energy storage devices capable of accumulating electricity from renewable sources, as well as deliver high power to smart and portable electronic devices due to their fast dynamic response, high power density, and long cycle-life [1,2]. So far, nanostructured electrodes with pseudocapacitive materials have been widely utilized to enhance the specific capacitance and energy density of supercapcitors [3,4]. However, such materials typically have low electrical conductivity (10) [5,6], degrade structurally under rigorous reaction conditions [7], and have a narrow electrochemical window (<1 V) [8,9] which can lead to high internal resistance, large irreversible capacitance loss, and poor rate capability and, consequently, result in supercapacitors with limited power density. A promising strategy to increase power density has been to extend operating cell voltage by taking advantage of an organic electrolyte, or an asymmetric cell configuration [10]. In terms of cost and safety, aqueous asymmetric supercapacitors (ASCs) are a suitable choice for commercial SCs [11]. Aqueous ASCs usually consist of a battery-type Faradic electrode for the energy source and a capacitor-type electrode for the power source, and employ aqueous electrolytes, which can increase cell voltage (up to 2 V) and hence improve both energy and power densities [11,12].Polyoxometalates (POMs) are attractive Faradic electrode materials because of their remarkable redox activity, structural integrity, and low cost [13][14][15]. However, POM-based electrodes are electrochemically unstable in aqueous solution due to the dissociation of ionic aggregates [13], which leads to unnecessary loss of specific capacitance. In addition, POM powders have low specific surface areas (<10 m 2 g −1) [16]. Therefore, POMs need to be anchored on an insoluble solid matrix with a high specific surface area to achieve high specific capacitance and stable cycle performance. In this respects, nanocarbons (e.g., carbon nanotubes [17][18][19][20] and graphene [21][22][23]) are good candidates for anchoring POMs. Moreover, their superior electrical conductivity and electrochemical/mechanical stability enable improvement in supercapacitor performance [20,22,23]. However, there has been limited success in utilizing POMs in SCs with satisfactory high specific capacitance and cycle performance, due to limited binding sites and difficulty dispersing the nanocarbons, as well as the weak interaction between POMs and nanocarbons, which still remain a challenge.Herein, we demonstrate aqueous ASCs based on a POM-graphene nanohybrid with polymeric ionic liquid (POM/PIL/G) as a positive elctrode and activated carbon (AC) as a negative electrode in an aqueous electrolyte of H 2 SO 4 . The polymeric ionic liquid (PIL) was selected as the surface functionality because of its high binding affinity for the graphene surface, and high ionic conductivity, as well as sufficient binding sites to produce a high density of POMs on the graphene surf...

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Covalently Tethered Polyoxometalate–Pyrene Hybrids for Noncovalent Sidewall Functionalization of Single‐Walled Carbon Nanotubes as High‐Performance Anode Material

Cited by 122 publications

References 59 publications

Dawson‐Type Polyoxomolybdate Anions (P₂Mo₁₈O₆₂⁶⁻) Captured by Ionic Liquid on Graphene Oxide as High‐Capacity Anode Material for Lithium‐Ion Batteries

Dawson‐Type Polyoxomolybdate Anions (P₂Mo₁₈O₆₂⁶⁻) Captured by Ionic Liquid on Graphene Oxide as High‐Capacity Anode Material for Lithium‐Ion Batteries

Polyoxometalate‐coupled Graphene via Polymeric Ionic Liquid Linker for Supercapacitors

High-performance asymmetric supercapacitors based on polyoxometalate-graphene nanohybrids

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Covalently Tethered Polyoxometalate–Pyrene Hybrids for Noncovalent Sidewall Functionalization of Single‐Walled Carbon Nanotubes as High‐Performance Anode Material

Cited by 122 publications

References 59 publications

Dawson‐Type Polyoxomolybdate Anions (P2Mo18O626−) Captured by Ionic Liquid on Graphene Oxide as High‐Capacity Anode Material for Lithium‐Ion Batteries

Dawson‐Type Polyoxomolybdate Anions (P2Mo18O626−) Captured by Ionic Liquid on Graphene Oxide as High‐Capacity Anode Material for Lithium‐Ion Batteries

Polyoxometalate‐coupled Graphene via Polymeric Ionic Liquid Linker for Supercapacitors

High-performance asymmetric supercapacitors based on polyoxometalate-graphene nanohybrids

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Dawson‐Type Polyoxomolybdate Anions (P₂Mo₁₈O₆₂⁶⁻) Captured by Ionic Liquid on Graphene Oxide as High‐Capacity Anode Material for Lithium‐Ion Batteries

Dawson‐Type Polyoxomolybdate Anions (P₂Mo₁₈O₆₂⁶⁻) Captured by Ionic Liquid on Graphene Oxide as High‐Capacity Anode Material for Lithium‐Ion Batteries